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Pomodoro Timer — Lofi Study Mode

Pomodoro timer with Lofi Study Mode — fullscreen ambient backgrounds, your own YouTube playback (lofi, motivational speech, sleep stories, rain), fully custom focus + break minutes, mini floating widget that keeps ticking while you work.

GPA & CGPA calculator with 4.0 / 5.0 / 10.0 scales and per-semester credit + grade input. Get SGPA per term and overall CGPA instantly.

Combine multiple PDFs into one — 100% offline, in your browser.

Advanced Scientific Calculator (100-Key)

Free online scientific calculator with 100 keys — trig (sin/cos/tan + inverse + hyperbolic), logs, powers, calculus (d/dx, ∫, Σ, lim), special functions (Γ, erf), programmer mode (HEX/OCT/BIN + bitwise), statistics (nCr, nPr, mean), memory + history.

Currency Converter

Convert between 20+ major currencies with live rates from the European Central Bank.

Calculate your exact age in years, months, days, hours and minutes.

AI Grammar Fixer

Fixes grammar and spelling without rewriting your voice.

Image Compressor

Compress JPG, PNG and WebP images in your browser — choose quality, format and max width.

Browse by Category

Jump to all tools ↓

Calculators

Finance, health, math, tax and loan calculators that give you the answer instantly.

49 active tools

Converters

Convert anything to anything — units, currencies, number systems, file formats.

58 active tools

Text Tools

Count, clean, transform and analyse text instantly.

Developer Tools

Formatters, encoders, generators and testers every developer needs.

16 active tools

Image & Design

Compress, resize, generate and pick — image and design utilities.

PDF & Document

Merge, split, compress and convert PDFs — entirely in your browser.

AI Tools

AI-powered writers, summarisers, translators and generators.

11 active tools

Time & Productivity

Timers, stopwatches, date math and productivity boosters.

Science & Education

Periodic tables, chemistry, physics and learning aids.

Fun & Random

Dice rolls, coin flips, wheel spinners and random generators.

Trading

Risk management, position sizing, growth and edge math for active traders.

15 active tools

Business

Calculators and generators for running a business — pricing, payroll, cash flow, customer metrics, operations.

40 active tools

SEO

Free SEO tools that work in your browser — on-page, technical, content, keywords, links, analytics, local.

36 active tools

Comparator

Side-by-side comparison tools — compare prices, products, plans, locations, anything. Build the decision in seconds, not tabs.

All Tools

Every one of the 258 tools we have, alphabetical.

AI Tools11 tools

AI Blog Outline Generator

SEO-structured outlines with H1, H2, H3 and content angles per section.

AI Code Generator

Working code with explanations — no pseudo-code or placeholder dots.

AI Cover Letter Writer

ATS-friendly cover letters tuned to the job description.

AI Email Writer

Writes professional emails with subject line, body and clear CTA.

AI Grammar Fixer

Fixes grammar and spelling without rewriting your voice.

AI Hashtag Generator

Platform-specific hashtag mix — trending, niche and branded.

AI Product Description Writer

Conversion-focused product descriptions that turn features into benefits.

AI Prompt Generator

Generate the perfect prompt for ChatGPT, Claude or Gemini.

Condense any article, doc or transcript without losing the important points.

Context-aware translation that handles idioms, tone and cultural nuance.

AI Writing Assistant

Adapts to any tone — formal, casual, persuasive — and writes the way you would.

Business40 tools

13-Week Cash Flow Forecast

Project 13 weeks of cash flow from opening balance + weekly inflow/outflow. See lowest balance.

Accounts Payable Aging Analysis

Track payables by aging bucket. Stretching beyond 45 days risks supplier relationships.

Accounts Receivable Aging Analysis

Categorise AR into 0-30 / 31-60 / 61-90 / 90+ buckets. Spot collection problems.

Break-Even Point Calculator

Calculate the units and revenue needed to cover fixed costs. Enter fixed costs, unit price and variable cost per unit.

Bundle Pricing Calculator

Combine 2+ products into a bundle with a single discount. Shows individual sum, savings, bundle price.

Burn Rate Calculator (Startup)

Calculate gross and net monthly burn rate from operating expenses and revenue.

Business Days Between Two Dates

Count weekdays between two dates, minus declared public holidays.

CAC — Customer Acquisition Cost Calculator

Fully-loaded CAC: all marketing + sales costs ÷ new customers acquired.

CAC Payback Period Calculator

Months to recover the cost of acquiring a customer. Healthy SaaS: under 12 months.

Churn Rate Calculator (Customer + MRR)

Calculate customer churn rate, gross MRR churn, and net MRR churn (with expansion offset).

Cohort Retention Calculator

Track customers from a cohort through month 1, 3, 6, 12. M12 retention = the LTV driver.

Contractor vs Employee Cost Calculator

Compare true annual cost of a contractor (hourly × hours) vs an employee (salary × 1 + benefits load).

Discount Percentage Calculator

Calculate the % off and absolute savings given the original price and the sale price.

DSO & DPO Calculator

Days Sales Outstanding and Days Payables Outstanding. Plus the cash conversion gap (DSO − DPO).

Free Invoice Generator

Build a printable invoice in 30 seconds — line items, tax, totals, copyable text output. No signup.

Free Quote Generator

Generate professional quotes / estimates with line items and tax. Identical to an invoice, just labeled "Quote".

FTE (Full-Time Equivalent) Calculator

Convert hours worked into FTEs for budgeting and headcount planning.

Gross Margin Calculator

Calculate gross profit and gross margin % from revenue and COGS. Also shows the equivalent markup percentage.

Late Fee / Interest Calculator

Calculate late fees on overdue invoices — % per month, flat fee per month overdue, or a combination of both.

LTV Calculator (Customer Lifetime Value)

SaaS LTV: ARPU × gross margin × (1 / churn). Always use gross margin, not revenue.

Markup Calculator

Set your selling price from cost based on desired markup OR desired margin. Shows price, profit, and the relationship between markup and margin.

Meeting Cost Calculator

Cost of a meeting = attendee salaries × duration. Make the price of bad meetings visible.

MRR / ARR Movement Calculator

Calculate Net New MRR (new + expansion − contraction − churn). Plus annualised ARR.

Net Present Value (NPV) Calculator

NPV from an initial investment, discount rate and a multi-year cash flow schedule. Verdict on whether the investment beats the hurdle rate.

Net Promoter Score (NPS) Calculator

Calculate NPS from promoter / passive / detractor counts. Plus benchmark band.

Overtime Pay Calculator (1.5× / 2×)

Calculate gross weekly pay including regular hours, overtime at 1.5×, and double-time at 2× (Sunday / holiday).

Payment Terms Calculator (2/10 Net 30, Etc.)

Calculate early-payment discounts. Enter invoice amount, discount %, discount window and net window — see your true APR.

PTO Accrual Calculator

Convert annual PTO days into per-pay-period hour accruals. Supports weekly / biweekly / semi-monthly / monthly cycles.

Recurring Invoice / Subscription Planner

Plan recurring billing — frequency, duration, loyalty discount. Outputs gross, net, annualised value.

Return on Investment (ROI) Calculator

Calculate total ROI and annualised ROI (CAGR) from initial investment, final value and years held.

ROAS Calculator (Return on Ad Spend)

Revenue ÷ ad spend = ROAS. Plus ROI % and profit/loss.

SaaS Tiered Pricing Builder (3-Tier)

Build the classic 3-tier SaaS pricing card — Starter / Pro / Business — with monthly + annual price math and feature lists.

Salary Raise Calculator (Real vs Nominal)

Calculate new salary after a % raise, plus the real gain after inflation. Spot stealth pay cuts.

Sales Commission Calculator (Flat or Tiered)

Calculate sales-rep commissions — flat % of revenue or tiered (different rates above threshold breakpoints).

Sales Win Rate Calculator

Calculate conversion rates across the sales funnel — leads → opportunities → closed-won — plus total revenue generated.

Severance Pay Estimator

Estimate severance based on years of service, weeks-per-year, and a maximum cap. For US/UK/India patterns.

Startup Runway Calculator

How many months of runway do you have? Plus calendar date when cash runs out.

Team Capacity Planner

True productive hours after PTO and meeting overhead. Planning against real capacity.

Total Compensation Builder

Combine base + bonus + equity (vesting-adjusted) + sign-on + benefits into a single year-1 and steady-state TC number.

Working Capital & Liquidity Ratios

Calculate working capital, current ratio, quick (acid-test) ratio, and cash ratio.

Calculators49 tools

Advanced Scientific Calculator (100-Key)

Free online scientific calculator with 100 keys — trig (sin/cos/tan + inverse + hyperbolic), logs, powers, calculus (d/dx, ∫, Σ, lim), special functions (Γ, erf), programmer mode (HEX/OCT/BIN + bitwise), statistics (nCr, nPr, mean), memory + history.

Baby Age Calculator

Calculate your baby's exact age in days, weeks, months and years from their date of birth. Includes milestone reference.

Calculate your Body Mass Index and see what category you fall into.

Compound Interest Calculator

See how your money grows with compounding — with optional monthly contributions.

Discount Calculator

Calculate sale prices, percentage off, and find the original price from a discounted price.

Calculate Equated Monthly Installment for any loan — home, car or personal.

FD Maturity Calculator (India)

Fixed deposit maturity calculator. Quarterly, monthly or yearly compounding. Compare maturity across banks by tweaking the rate and tenure.

Fraction Calculator

Add, subtract, multiply and divide fractions — auto-simplifies and shows decimal + mixed number.

GST / Sales Tax Calculator Pakistan 🇵🇰

Add or strip Pakistan GST (Sales Tax) at the 18% standard rate. Provincial service tax options included.

Calculate GST inclusive and exclusive amounts for India instantly.

HRA Exemption Calculator (India)

Calculate your House Rent Allowance exemption under Section 10(13A). Enter basic salary, HRA received and rent paid — see the exempt amount instantly.

Income Tax Calculator (India)

Calculate income tax for FY 2025-26 — both old and new regime, with all deductions and rebates.

Income Tax Calculator Bangladesh 🇧🇩

Calculate your annual income tax in Bangladesh. Bengali language toggle available.

Income Tax Calculator Kenya 🇰🇪

Calculate your annual PAYE (Pay As You Earn) tax in Kenya. Swahili language toggle available.

Income Tax Calculator Nigeria 🇳🇬

Calculate your Nigerian PIT (Personal Income Tax) annually. Latest 7%–24% progressive slabs.

Income Tax Calculator Pakistan 🇵🇰

Calculate your annual income tax in Pakistan with the latest Finance Act 2024 slabs. Urdu language toggle available.

Income Tax Calculator Philippines 🇵🇭

Calculate your annual income tax in the Philippines under TRAIN Law. Filipino language toggle available.

Income Tax Calculator South Africa 🇿🇦

Calculate your annual income tax in South Africa using SARS's 2024-25 individual tax tables. Primary rebate applied.

Income Tax Calculator Sri Lanka 🇱🇰

Calculate your annual income tax in Sri Lanka. Sinhala language toggle available.

Income Tax Calculator UAE 🇦🇪

The UAE does not levy personal income tax on salary. This calculator confirms zero-tax for individuals and explains the corporate tax landscape.

Macro Calculator

Convert daily calories into protein, carbs and fat targets — 6 preset splits or custom.

Mortgage Calculator

Calculate monthly mortgage payments with property tax, insurance and HOA included.

NPS Pension Calculator (India)

National Pension System corpus + monthly pension calculator. Enter monthly contribution, age and expected return — see corpus at 60, 60% tax-free lump-sum and monthly pension.

Percentage Calculator

Calculate percentages three ways — X% of Y, X is what % of Y, % change.

Period Date Predictor (Next + Fertile Window)

Predict your next 6 periods + ovulation day + fertile window. Adjustable cycle and period length.

PPF Maturity Calculator (India)

PPF maturity value calculator for any deposit, rate and tenure. Defaults to the current 7.1% rate and standard 15-year lock-in. Shows tax-free interest earned.

Pregnancy Due Date Calculator

Estimate your baby's due date by LMP, conception date or first ultrasound. Includes current week, trimester and percent complete.

Pregnancy Trimester Calculator

See exactly which trimester you're in based on your last menstrual period. Includes milestones for each trimester.

RD (Recurring Deposit) Calculator (India)

Recurring deposit maturity calculator. Enter monthly deposit, tenure in months and interest rate — see maturity + interest earned.

Salary Calculator Bangladesh 🇧🇩

Gross to net salary calculator for Bangladesh. Income tax slabs 0-25%.

Salary Calculator Kenya 🇰🇪

Gross to net salary calculator for Kenya. PAYE + NSSF + SHIF + Housing Levy.

Salary Calculator Nigeria 🇳🇬

Gross to net salary calculator for Nigeria. PIT slabs + 8% pension + 2.5% NHF.

Salary Calculator Pakistan 🇵🇰

Gross to net (in-hand) salary calculator for Pakistan. Includes income tax + EOBI deduction.

Salary Calculator Philippines 🇵🇭

Gross to net salary calculator for the Philippines. TRAIN Law tax + SSS + PhilHealth + Pag-IBIG.

Salary Calculator South Africa 🇿🇦

Gross to net salary calculator for South Africa. SARS PAYE + UIF.

Salary Calculator Sri Lanka 🇱🇰

Gross to net salary calculator for Sri Lanka. Income tax + 8% EPF.

Salary Calculator UAE 🇦🇪

UAE has zero personal income tax. This calculator confirms your gross = net for expat employees.

See how a Systematic Investment Plan grows over time with compounding.

Sleep Cycle Calculator

Find the best times to sleep or wake up based on 90-minute sleep cycles.

Statistics Calculator

Calculate mean, median, mode, std deviation, quartiles and IQR from any list of numbers.

TDEE / Calorie Calculator

Calculate your Total Daily Energy Expenditure with the Mifflin-St Jeor formula.

Quickly calculate the tip and split the bill across any number of people.

VAT Calculator Bangladesh 🇧🇩

Add or strip Bangladesh VAT. Standard 15% plus multiple reduced rates (10%, 7.5%, 5%).

VAT Calculator Kenya 🇰🇪

Add or strip Kenya VAT. Standard 16% plus 8% on petroleum and zero on basic food.

VAT Calculator Nigeria 🇳🇬

Add or strip Nigerian VAT at 7.5%. Zero-rated categories (basic food, medical, exports) included.

VAT Calculator Philippines 🇵🇭

Add or strip Philippines VAT at 12%. Zero-rated for exports.

VAT Calculator South Africa 🇿🇦

Add or strip South Africa VAT at 15%. Basic-foods list zero-rated.

VAT Calculator Sri Lanka 🇱🇰

Add or strip Sri Lanka VAT at 18% (raised from 15% in January 2024).

VAT Calculator UAE 🇦🇪

Add or strip UAE VAT at 5% (one of the lowest standard rates globally).

Converters58 tools

AVIF to JPG Converter

Convert AVIF images to JPG. Useful when sharing with apps that don't support AVIF yet.

AVIF to PNG Converter

Convert AVIF to lossless PNG with full transparency support.

BMP to JPG Converter

Convert BMP bitmaps to JPG for huge file-size savings on photos.

BMP to PNG Converter

Convert old Windows Bitmap (.bmp) files to PNG. PNG is 5–10× smaller and supported everywhere.

CSV to Excel Converter

Build a .xlsx workbook from CSV data. Handles quoted fields, embedded commas/newlines. Browser-only.

CSV to Markdown Table Converter

Convert CSV to a properly-aligned Markdown table. Great for GitHub READMEs, docs, and Notion pages.

CSV to TSV Converter

Convert CSV to TSV. Tabs avoid CSV's comma-escaping pain and copy-paste cleanly into spreadsheets.

cURL to Fetch Converter

Convert curl commands to JavaScript fetch() code. Handles -X, -H, -d, -u, Authorization, JSON bodies.

Currency Converter

Convert between 20+ major currencies with live rates from the European Central Bank.

Excel to CSV Converter

Convert .xlsx (or .xls / .ods) workbooks to clean CSV. Pick which sheet to export. Browser-only.

Excel to HTML Table Converter

Convert a sheet to a styled HTML table. Live preview, copy or download as .html. Browser-only.

Excel to JSON Converter

Convert an Excel workbook into a JSON array of row-objects. First row becomes the keys. Browser-only.

Decrypt a .enc file produced by our File Encrypter using its password. Runs in your browser, AES-256-GCM.

Encrypt any file with a password using AES-256-GCM. Browser-only — files never upload. Output is a .enc file readable only with the same password.

File Hash Generator

Compute SHA-1, SHA-256, SHA-384, SHA-512 of any file. Verify downloads, dedupe files, check integrity. Browser-only.

Files to ZIP Converter

Bundle multiple files into a single ZIP. Adjustable compression level, custom output name, drag-drop ordering.

GIF to JPG Converter

Extract the first frame of a GIF as a JPG.

GIF to PNG Converter

Extract the first frame of a GIF as a PNG. PNG handles modern color depth properly.

HTML to JSX Converter

Convert HTML to JSX. Renames class → className, for → htmlFor, kebab-case SVG attrs to camelCase, inline styles to object form.

HTML to Markdown Converter

Convert HTML to clean Markdown. Powered by Turndown — preserves headings, lists, code blocks, links, blockquotes.

ICO to PNG Converter

Convert Windows ICO favicon files to PNG for editing.

JPG to AVIF Converter

Convert JPG to AVIF for smaller files at the same visual quality.

JPG to PNG Converter

Convert JPG to PNG losslessly in your browser. Useful for editing, printing, or further re-encoding without quality loss.

JPG to WebP Converter

Convert JPG to WebP. Typically 25–35% smaller at the same visual quality.

JSON to Excel Converter

Convert a JSON array of objects into a .xlsx workbook. Object keys become column headers. Browser-only.

JSON to Go Struct Converter

Generate Go structs (with JSON tags) from any JSON sample. Nested objects become nested types.

JSON to Markdown Table Converter

Convert a JSON array of objects to a Markdown table. Union of keys becomes the header row.

JSON to TypeScript Interface Converter

Generate TypeScript interfaces from any JSON sample. Nested objects become nested interfaces; arrays become typed unions.

JSON to XML Converter

Convert JSON to XML in your browser. Object keys become tag names; arrays become repeated tags.

Markdown to HTML & HTML to Markdown

Round-trip Markdown ↔ HTML converter with live preview. CommonMark + GFM via marked; clean MD output via Turndown.

Markdown to Plain Text Converter

Strip all Markdown formatting and get clean plain text. Useful for word counts, exports, accessibility.

Number System Converter

Convert between binary, octal, decimal and hexadecimal — all four directions.

Password-Protect a ZIP

Build an AES-256 password-protected ZIP from any files. Compatible with WinRAR, 7-Zip, and macOS Archive Utility.

PDF Page Extractor

Pull specific pages out of a PDF into a new PDF. Range syntax like 1-3, 5, 7-9. Lossless — no re-encoding.

PDF to HTML Converter

Extract PDF content as semantic HTML with one <article> per page. Clean enough to embed in a webpage.

PDF to Markdown Converter

Extract PDF content as Markdown with per-page headings. Good first draft for re-publishing on a blog or docs site.

PDF to Text Converter

Extract all text from a PDF into plain UTF-8 text. Page-separated, ready for paste anywhere. Browser-only.

PNG to AVIF Converter

Convert PNG to AVIF for ~50% smaller files at the same visual quality. Modern browsers only.

PNG to JPG Converter

Convert PNG images to JPG (JPEG) in your browser. Adjustable quality, transparency flattened to white.

PNG to WebP Converter

Convert PNG to WebP. WebP is 25–35% smaller than PNG at the same visual quality and supports transparency.

Query String to JSON Converter

Convert a URL query string to JSON. Handles repeated keys (arrays) and PHP-style bracket nesting like filters[year]=2026.

Remove ZIP Password

Unlock a password-protected ZIP using its password and repack it without encryption. Browser-only.

Roman Numeral Converter

Convert numbers (1-3999) to Roman numerals and back.

SBV to SRT Converter

Convert YouTube SBV captions to SRT for use in video editors.

SBV to VTT Converter

Convert YouTube SBV captions to WebVTT for HTML5 video players.

SQL INSERT to JSON Converter

Convert SQL INSERT INTO … VALUES (…) statements to a JSON array of rows. Supports NULL, booleans, numbers, quoted strings.

SRT to SBV Converter

Convert SRT subtitles to YouTube SBV format.

SRT to VTT Converter

Convert SRT subtitles to WebVTT for HTML5 video players. Fixes the comma-vs-dot millisecond separator and adds the WEBVTT header.

Decrypt base64 ciphertext produced by our Text Encrypter using its password. AES-256-GCM, browser-only.

Encrypt any text with a password. Output is a base64 string safe for email, SMS, or chat. AES-256-GCM, browser-only.

TSV to CSV Converter

Convert tab-separated values to comma-separated values. Handles quoting and embedded commas/newlines correctly.

Convert length, weight, temperature, volume and speed — all units, all directions.

VTT to SBV Converter

Convert WebVTT to YouTube SBV format.

VTT to SRT Converter

Convert WebVTT captions to SRT. Most video editors and DVD/Blu-ray tools still expect SRT.

WebP to JPG Converter

Convert WebP to JPG. Transparency is flattened to white. Useful when you need a JPG specifically.

WebP to PNG Converter

Convert WebP images to PNG. Useful for tools and editors that don't accept WebP yet.

XML to JSON Converter

Convert XML to JSON in your browser. Repeated tags become arrays; text content auto-coerces numbers and booleans.

Extract a .zip file in your browser. List contents, filter by name, download files individually or in bulk.

Developer Tools16 tools

Base64 Encoder & Decoder

Encode any text to Base64 or decode Base64 back to text — UTF-8 safe.

Cron Expression Builder

Write and decode cron expressions — with live plain-English explanation and presets.

Hash Generator (SHA family)

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text.

HTML Encoder & Decoder

Escape HTML special characters or decode HTML entities back to text.

Image to Base64 Converter

Convert any image to a Base64 data URL — for inline embedding in HTML, CSS or JSON.

JSON ↔ CSV Converter

Convert JSON to CSV or CSV to JSON — handles quoted fields, embedded newlines and missing keys.

JSON Formatter & Validator

Beautify, minify and validate JSON — entirely in your browser.

JSON to YAML Converter

Convert JSON to clean, readable YAML — entirely client-side, no dependencies.

Decode JSON Web Tokens to inspect header and payload — entirely client-side.

Markdown Editor

Distraction-free markdown editor with live preview, auto-save and download.

Markdown to HTML

Convert Markdown text to clean HTML with live preview. CommonMark-compliant.

Password Generator

Generate strong random passwords with custom length and rules.

Test JavaScript regular expressions live with match highlighting and capture groups.

Convert any title or phrase into a clean URL slug.

URL Encoder & Decoder

Encode special characters for URLs or decode encoded URLs back to readable text.

Generate version 4 UUIDs in bulk — using cryptographic randomness.

Fun & Random2 tools

Random Decision Maker

Coin flip, dice roll or pick from your custom list — three random tools in one.

Random Number Generator

Generate random integers in any range — single number or bulk, with no-duplicates option.

Image & Design9 tools

Aspect Ratio Calculator

Resize while preserving aspect ratio — pick a preset or use custom dimensions.

Color Palette Generator

Generate harmonious color palettes — analogous, complementary, triadic and more.

Color Picker (HEX, RGB, HSL)

Pick a color and copy it as HEX, RGB, HSL or a CSS variable.

CSS Border Radius Generator

Build CSS border-radius visually — link or unlink corners, see live preview.

CSS Box Shadow Generator

Build CSS box shadows visually — control offset, blur, spread, color, opacity and inset.

CSS Gradient Generator

Build linear or radial gradients with multiple stops — copy ready CSS.

Favicon Generator

Generate text-based favicons in 6 standard sizes (16-256px) with custom colors.

Image Compressor

Compress JPG, PNG and WebP images in your browser — choose quality, format and max width.

QR Code Generator

Generate QR codes for URLs, text, Wi-Fi credentials, email and phone numbers.

PDF & Document5 tools

Delete PDF Pages

Remove specific pages from a PDF — entirely in your browser.

Combine JPG / PNG images into a single PDF — fully offline.

Combine multiple PDFs into one — 100% offline, in your browser.

Rotate all or selected pages of a PDF by 90, 180, or 270 degrees — offline.

Extract specific pages from a PDF — entirely offline.

Science & Education5 tools

CGPA to Percentage Converter (Indian Universities)

Convert CGPA (10-point) to percentage by university — VTU, Anna, Mumbai, Pune, AKTU, CBSE, Delhi. Each uses a slightly different formula.

Final Exam Grade Needed Calculator

Find out the exact score you need on your final exam to hit your target grade. Just plug in your current grade, target grade and final's weight.

GPA & CGPA calculator with 4.0 / 5.0 / 10.0 scales and per-semester credit + grade input. Get SGPA per term and overall CGPA instantly.

Interactive Periodic Table

Click any element to see its atomic mass, group and properties.

Virtual Chemistry Reactor

Combine elements to see common compounds and reactions.

SEO36 tools

A/B Test Sample Size Calculator

Calculate required sample size for an A/B test given baseline CVR, minimum detectable lift, and confidence.

Alt-Text Auditor (HTML <img> Audit)

Paste HTML — instantly find images with missing, empty, too-long or too-short alt attributes. Accessibility + image SEO.

Anchor Text Audit & Diversity Scorer

Paste your anchor list — get distribution (exact / partial / branded / generic / URL / naked) and a 0–100 diversity score.

Anchor Text Builder (Balanced Mix)

For a target keyword, brand and URL, generate a balanced anchor-text list (10/25/30/20/15 exact/partial/branded/naked/generic).

Breadcrumb Schema (JSON-LD) Generator

Generate BreadcrumbList JSON-LD schema markup. Helps Google show breadcrumb trails in SERPs instead of raw URLs.

Content Brief Builder (SEO Brief Template)

Generate a structured content brief from a target keyword: title options, outline, entity list, internal-link reminders.

Conversion Rate & Lift Calculator

Calculate conversion rate from visitors and conversions. Plus relative lift between two CVRs.

CTR Estimator by SERP Position

Estimate clicks from impressions based on average SERP position 1–10. Visual click-curve.

FAQ Schema (JSON-LD) Generator

Build FAQPage JSON-LD schema from question + answer pairs. Drop in head and watch FAQ rich results appear in Google.

Flesch-Kincaid Readability Checker

Calculate Flesch reading ease (0–100) and grade level for any text. Aim for 8th grade or lower for general audiences.

Google Analytics Goal Value Calculator

Assign $ value to non-revenue GA goals (newsletter signups, form fills) for channel ROI comparison.

Google Business Profile Post Planner

Plan and format Google Business Profile posts — updates, offers, events, products — with a posting checklist.

Google Disavow File Builder

Build a properly formatted disavow.txt for Google Search Console. Domain-level or URL-level, with optional comments for each entry.

Heading Hierarchy Checker (H1–H6)

Paste HTML or markdown — see your full heading outline + automatic issue detection (missing H1, skipped levels, multiple H1s).

Hreflang Tag Generator (International SEO)

Generate hreflang link tags for any number of language/region variants. Includes x-default fallback. Drop in head.

Keyword Clusterer (By Root Stem)

Paste a keyword list — group by their longest non-stopword root. Each cluster becomes one piece of content covering the variants.

Keyword Density Analyzer

Analyze content for keyword density. Counts target-phrase occurrences plus the top 20 most-frequent non-stopword keywords.

Keyword Difficulty Estimator (Free Heuristic)

Get a quick 0–100 difficulty score for any keyword based on length, modifier presence and commercial intent. No API key.

Keyword Intent Classifier (Free Batch)

Paste a list of keywords — get each classified as Informational, Commercial, Transactional or Navigational. Plus a confidence flag.

Link Prospect List Categoriser

Paste a list of prospect URLs — auto-classify by domain type (Edu / Gov / News / Community / Blog) and outreach tier (High / Mid / Low).

Local Citation Source List (By Country)

Curated list of citation directories filtered by country (India, Pakistan, Nigeria, Philippines, USA, UK, etc.) with priority tiers.

LocalBusiness JSON-LD Schema Generator

Generate full LocalBusiness JSON-LD schema (with hours, rating, address). Pick from 10 specialised business types.

Long-Tail Keyword Expander

Generate dozens of long-tail variations from a seed keyword using comparative, info, audience, geo, year, free and comparison modifiers.

Meta Description Preview & Length Checker

Check meta description length against Google's desktop (160) and mobile (120) limits. SERP-style preview included.

Meta Tag Generator

Generate SEO + Open Graph + Twitter meta tags with character count warnings and Google preview.

NAP Consistency Checker (Local SEO)

List your business name, address and phone across every directory — instantly spot inconsistencies that hurt local rankings.

Outreach Email Generator (Guest Post / Broken Link / Mention / Resource)

Generate outreach email templates for four common pitch types: guest post, broken-link replacement, unlinked-mention claim, resource-page add.

Passive-Voice Detector

Paste text — get a list of sentences flagged for passive voice. Aim for under 10% passive in body copy.

Question Keyword Generator

Generate question keywords (what / how / why / when / where / which / who / how much / how long) from any seed topic.

Reading Time Estimator

Estimate how long an article takes to read at the WPM of your choice. Defaults to 220 wpm (average adult).

Robots.txt Generator

Visual robots.txt builder — pick user-agent, allow/disallow paths, point to your sitemap. Output ready to paste.

SERP Preview Tool (Google Desktop + Mobile)

See exactly how your title and meta description render in Google search results, on both desktop and mobile.

Service-Area JSON-LD Schema Generator

For mobile businesses that travel to clients (cleaners, electricians) — list every city you serve with proper Service schema.

Sitemap.xml Generator (Free, Online)

Paste a list of URLs and instantly generate a valid sitemap.xml with lastmod, changefreq and priority. No signup, no upload.

Title Tag Length Checker (Pixel-Based)

Check your title tag against Google's pixel-width limit (~580px desktop). Character counts lie — pixels are the real constraint.

UTM Link Builder

Build properly-formatted UTM-tagged URLs for campaign tracking in Google Analytics.

Text Tools6 tools

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences or words.

Text Case Converter

Convert text to UPPER, lower, Title, camelCase, snake_case and 5 more cases.

Text Diff Checker

Compare two pieces of text line by line — see what was added and removed.

Reverse text, sort lines, remove duplicates, collapse spaces and more — 8 utilities in one.

Count words, characters, sentences and reading time in any text.

Word Frequency Counter

Count how often each word appears in your text — with stopword filter and visual bars.

Time & Productivity6 tools

Calculate your exact age in years, months, days, hours and minutes.

Date Difference Calculator

Calculate the time between two dates — years, months, days, weeks and total minutes.

Pomodoro Timer — Lofi Study Mode

Pomodoro timer with Lofi Study Mode — fullscreen ambient backgrounds, your own YouTube playback (lofi, motivational speech, sleep stories, rain), fully custom focus + break minutes, mini floating widget that keeps ticking while you work.

Online stopwatch with lap times — accurate to the millisecond.

Time Zone Converter

Convert any date + time between time zones — live mode included. India to China, IST to EST, UTC to anywhere. Friendly country labels.

World clock with a full-screen ambient mode. See the current time in 23+ cities side by side — Mumbai, Beijing, New York, London, Tokyo and more.

Trading15 tools

Average Down / DCA Calculator

Blend multiple buys at different prices into a single average cost basis.

Black-Scholes Calculator

Theoretical option price + full Greeks (delta, gamma, theta, vega, rho).

Crypto Exchange Fee Comparator

Compare spot trading fees across 10 major crypto exchanges. See annual cost.

Drawdown Recovery Calculator

See exactly how much gain you need to recover from a drawdown. The asymmetry is brutal.

Forex Position Size Calculator

Position size in units and lots based on account size, pair, risk %, and stop-loss in pips.

Kelly Criterion Calculator

The mathematically optimal position size based on your win rate and win/loss ratio.

Margin & Leverage Calculator

Required margin, capital used, and liquidation distance for any leveraged position.

Options Profit Calculator

P&L at expiration for long/short calls and puts, with break-even and payoff chart.

Pip Value Calculator

Pip value in your account currency for any forex pair and lot size.

Position Size Calculator

How many shares, units or lots to buy given your account size and risk tolerance.

Profit / Loss Calculator

Net P&L + ROI for any trade — works for stocks, forex, crypto. Includes fees.

Risk / Reward Calculator

Compute R:R ratio, break-even win rate, and expected value for any trade setup.

Sharpe Ratio Calculator

Measure your strategy's risk-adjusted return — the universal trader benchmark.

Trading Compound Calculator

Project how a consistent monthly return rate compounds over months or years.

Trading Journal

Log every trade. Auto-calculates win rate, expectancy, profit factor. Stored in your browser.