Developer Tools

Formatters, encoders, generators and testers every developer needs.

16 tools across 3 sub-categories

Code Formatters

Format and validate JSON, HTML, CSS.

6 tools

Markdown to HTML Converter

Convert Markdown to clean HTML with live preview — entirely in your browser.

Regex Tester

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

JSON ↔ CSV Converter

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

Markdown Editor

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

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.

Code Generators

Passwords, UUIDs, regex, CSS.

4 tools

Slug Generator

Convert any title or phrase into a clean URL slug.

Cron Expression Builder

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

UUID Generator

Generate version 4 UUIDs in bulk — using cryptographic randomness.

Password Generator

Generate strong random passwords with custom length and rules.

Encoders & Decoders

Base64, URL, JWT, hash.

6 tools

URL Encoder & Decoder

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

Base64 Encoder & Decoder

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

Image to Base64 Converter

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

HTML Encoder & Decoder

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

Hash Generator (SHA family)

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

JWT Decoder

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

Converters that fit Developer Tools

Free in-browser converters from our full toolkit. Open one here or browse all in Converters.

24 tools

File Decrypter

Converter

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

File Security

Remove ZIP Password

Converter

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

File Security

Text Decrypter

Converter

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

File Security

HTML to JSX Converter

Converter

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

Code Converters

Password-Protect a ZIP

Converter

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

File Security

HEX to RGB Converter

Converter

Convert a HEX color code to RGB (and HSL, HSV, CMYK, OKLCH). Live picker, copy any format.

Color Converters

PDF to HTML Converter

Converter

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

PDF Converters

Currency Converter

Converter

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

Currency Converters

File Encrypter

Converter

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 Security

PDF to Text Converter

Converter

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

PDF Converters

RGB to HEX Converter

Converter

Convert RGB values to a HEX color code (and HSL, HSV, CMYK, OKLCH). Live picker, copy any format.

Color Converters

Text Encrypter

Converter

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

File Security

CSV to TSV Converter

Converter

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

Data Converters

Excel to HTML Table Converter

Converter

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

Excel Converters

Excel to JSON Converter

Converter

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

Excel Converters

JSON to Excel Converter

Converter

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

Excel Converters

JSON to Markdown Table Converter

Converter

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

Data Converters

JSON to XML Converter

Converter

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

Data Converters

Number System Converter

Converter

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

Number Converters

PDF to Excel Converter

Converter

Extract tables from a PDF into a real Excel (.xlsx) spreadsheet, in your browser. Table rows and columns are detected from the text layout; numbers arrive as numbers so formulas work immediately.

PDF Converters

SQL INSERT to JSON Converter

Converter

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

Code Converters

TSV to CSV Converter

Converter

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

Data Converters

CSV to Excel Converter

Converter

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

Excel Converters

CSV to Markdown Table Converter

Converter

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

Data Converters

The everyday dev bench

Every developer keeps a drawer of small utilities open in a pinned tab — format this JSON, decode that token, generate a UUID. This niche is that drawer. The tools are deliberately fast and focused: paste, get the result, copy it back into your editor. Because everything runs client-side, you can safely paste an internal payload or a real JWT without it leaving your machine.

The JSON Formatter & Validator pretty-prints and catches the trailing comma that broke your API call, the JWT Decoder shows the claims inside a token without sending it to a third party, and the Base64 Encoder & Decoder handles data URIs and headers. For scaffolding, the UUID Generator and Cron Expression Builder save a trip to the docs.

Day-to-day tasks this covers:

Validating and reformatting messy JSON or YAML
Inspecting a JWT’s header, payload and expiry
Encoding/decoding Base64, URL and HTML strings
Testing a regular expression against sample text
Generating UUIDs, secure passwords and URL slugs

No telemetry, no signup, nothing uploaded. Free to use as often as your workflow demands.