⌨Developer Tools
Free browser-based utilities built for developers — runs entirely client-side, no data leaves your machine, no sign-up required.
Format, validate, minify and compare JSON data instantly.
Decode and inspect JWT tokens or encode new ones, fully client-side.
Encode or decode Base64 strings and files including images.
Encode and decode URLs and query parameters online, with component and full-URL modes and full Unicode support — all in your browser.
Test and debug regular expressions live — highlight matches, inspect capture and named groups, and try replacements, all in your browser.
Convert Unix timestamps to human-readable dates and back, in seconds or milliseconds, UTC or local time — with a live current-timestamp readout.
Turn a cron expression into plain English and see the next run times.
Generate UUID v4, v7, and ULID values in bulk — free, client-side, no sign-up.
Encode and decode HTML entities — named, decimal, and hex — with full Unicode support, safely in your browser.
Build CSS gradients visually and copy the ready-to-use code.
Write Markdown and see the rendered HTML output side by side.
Compare two texts and highlight the differences — line and word-level, side-by-side or inline — entirely in your browser.
Generate complementary, triadic or analogous colour palettes.
Format and beautify SQL queries online for MySQL, Postgres, and SQLite — with keyword casing, indent options, and a minify mode, all in your browser.
Look up any HTTP status code instantly — all 1xx–5xx codes with plain-English descriptions, searchable and filterable by class, with one-click copy.
Minify HTML, CSS, and JavaScript online to shrink file size — with a bytes-saved readout and copy/download, all in your browser.
About these developer tools
This collection covers the quick tasks developers reach for daily. Every tool here runs entirely in your browser — no server round-trips, no accounts, no rate limits. Paste a minified JSON blob and get clean, readable, indented output in one step. Decode a JWT token and inspect the header, payload, and expiry without sending it anywhere. Test a regex pattern against live sample data with match highlighting and named group extraction.
Whether you're debugging an API response, cleaning up a CI pipeline config, converting timestamps across timezones, or exploring an unfamiliar data structure — these tools are built to get out of your way and let you work.