Utilities that speed up everyday development.
A focused set of free developer tools — JSON formatter, regex tester, JWT decoder, hash generator, and more. Every tool runs locally in your browser so sensitive data (tokens, payloads, source code) never leaves your device.
Format, validate, and beautify JSON data with syntax highlighting.
Paste JSON and get TypeScript types and interfaces instantly.
Beautify SQL queries across dialects — PostgreSQL, MySQL, SQLite, and more. 100% in-browser.
Beautify or minify HTML, CSS, and JavaScript/TypeScript — all in your browser.
Obfuscate JavaScript source code with low / medium / high presets — entirely in your browser.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
Generate HMAC signatures (SHA-1/256/384/512) from a message and secret key. Uses WebCrypto.
Encrypt or decrypt text with a passphrase using AES-GCM. Runs entirely in your browser.
Generate BIP39 seed phrases (12/15/18/21/24 words) offline in your browser. Useful for cryptocurrency wallets.
Test regular expressions with live matching, highlighting, and capture groups.
Convert between HEX, RGB, and HSL color formats with live preview.
Structural diff of two JSON objects — highlights added, removed, and changed keys.
Inspect Unicode code points, escapes, normalization forms, and byte breakdowns of any string.
Visually design CSS box-shadows with a live preview. Supports multi-layer stacks.
Design linear, radial, and conic CSS gradients with a live preview.
Visually design CSS border-radius shapes — from simple rounded corners to organic blobs.
Send HTTP requests and organize collections in your browser. Share collections via end-to-end encrypted links — server never sees your data.
Generate UUID v4 and v7 identifiers. Bulk generate and copy.
Generate arrays of realistic fake data for testing — users, products, addresses, and custom schemas.
Explain cron expressions in plain English and preview the next runs. All client-side.
Yes. Every tool on this page is free to use with no login, rate limits, or watermarks.
Yes. All developer tools here run entirely in your browser. Nothing is uploaded or logged.
After the first load the tools are cached and largely work offline. Some tools that pull external libraries on demand may need network on first use.