Patrache DevTools

Free Online Tools for Developers

Use 90+ tools like JSON formatter, Base64 encoder, and regex tester instantly in your browser.

Input{"name":"Patrache","tools":90,"free":true}

{
  "name": "Patrache",
  "tools": 90,
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}

90+

Developer Tools

Tools by Category

JSON Tools8 tools

Encoding/Decoding9 tools

Hash & Encryption6 tools

Text Tools10 tools

Regex & Code7 tools

Web & Network10 tools

Popular Tools

Base64 Encoder & DecoderBase64 encoder and decoder for text and files: convert any input into a Base64 string or restore the original data. Full UTF-8 support and URL-safe encoding options, free and instant in your browser.JSON Formatter & ViewerJSON formatter and viewer that beautifies minified or single-line JSON with proper indentation, shows it in a collapsible tree and flags syntax errors. Free and instant in your browser.MD5 Hash GeneratorMD5 hash generator for text or files, using a pure JavaScript implementation of RFC 1321. Ideal for integrity checks and data verification, free and instant in your browser.JSON ValidatorJSON validator that checks whether a JSON string is syntactically valid and pinpoints the exact line and column of any error. Fix missing commas or quotes in seconds, free in your browser.SHA-256 Hash GeneratorSHA-256 hash generator that computes secure digests from text or uploaded files with the Web Crypto API, including HMAC-SHA256 with a secret key. Verify hashes by comparison, free and entirely in your browser.JSON DiffJSON diff tool that compares two JSON objects side by side and color-highlights added, deleted and changed keys. It traverses nested structures deeply so every difference stands out, free in your browser.Password GeneratorPassword generator that creates cryptographically secure random passwords with crypto.getRandomValues and measures entropy strength in bits. Exclude ambiguous characters, pick 4 to 128 characters and generate in bulk, free in your browser.JSON to YAML ConverterFree online tool to convert between JSON and YAML in both directions, auto-detecting the input format and preserving indentation and nested structure.

Why Patrache Studio DevTools?

100% Free

All tools are free to use. No sign-up or payment required.

No Installation

Everything runs in your browser. No software to download or install.

Privacy First

All data processing happens in your browser. Nothing is sent to our servers.

20 Languages

Available in 20 languages for developers around the world.

3 Simple Steps

No complex setup. Just start using.

Choose a Tool

Browse categories or search for the tool you need.

Enter Your Data

Type your text or upload a file.

Get Results

Instantly see the result, then copy or download it.

Frequently Asked Questions

No. Every tool is plain JavaScript that runs inside your browser tab, so the text, JSON or image you paste stays on your device. Open the Network panel of your browser's developer tools while a tool runs and you will see no upload request. That is also why most tools keep working after you lose your connection.

There are 90+ tools in 12 categories: JSON formatting, validation and diffing; Base64, URL and JWT encoding; SHA-256, MD5, bcrypt and HMAC hashing; text diff, case conversion and dedupe; regex, cron and code formatters; CSS, QR and UUID generators; image and SVG conversion; CIDR and IP calculations. There are also references such as HTTP status codes and Git commands.

Neither. Each tool is a static page that opens straight from its URL in Chrome, Safari, Firefox or Edge, on desktop and on mobile. There is nothing to sign up for, nothing to download and no usage limit.

Yes. Every tool has a permanent URL you can bookmark or share, and the action bar under each tool gives you a ready-made iframe snippet to paste into your own page. Tools that keep a result state also offer a result permalink, so a colleague opens exactly the screen you were looking at.

Start Using Now

No sign-up. No installation. Completely free.

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