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.

Markdown Editor

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

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.

Code Generators

Passwords, UUIDs, regex, CSS.

4 tools

Slug Generator

Convert any title or phrase into a clean URL slug.

UUID Generator

Generate version 4 UUIDs in bulk — using cryptographic randomness.

Cron Expression Builder

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

Password Generator

Generate strong random passwords with custom length and rules.

Encoders & Decoders

Base64, URL, JWT, hash.

6 tools

JWT Decoder

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

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.

Converters that fit Developer Tools

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

24 tools

Remove ZIP Password

Converter

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

File Decrypter

Converter

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

File Security

Text Decrypter

Converter

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

File Security

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

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

Currency Converter

Converter

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

Currency 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

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

HEX to RGB Converter

Converter

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

Color 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

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

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

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 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

CSV to TSV Converter

Converter

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

Data Converters

File Hash Generator

Converter

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

File Security

HEX to HSL Converter

Converter

Convert HEX to HSL (hue, saturation, lightness) plus RGB, HSV, CMYK, OKLCH.

Color Converters

HEX to OKLCH Converter

Converter

Convert HEX to OKLCH — the perceptually-uniform color space used in modern CSS. Plus RGB, HSL, HSV, CMYK.

Color Converters

JSON to Go Struct Converter

Converter

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

Code 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

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.