Categories
Explore free browser-based developer tools organized by workflow.
20 categories
Format, validate, convert, and diff JSON in the browser - from messy API dumps to TypeScript interfaces.
Word count, case conversion, find/replace, diffs, slugs, and line cleanup for everyday string work.
URL encoding, Base64, and HTML entities for query strings, data URLs, and safe markup.
Hashes, UUIDs, JWTs, passwords, tokens, bcrypt, and AES helpers for local prototyping.
Flexbox, grid, gradients, shadows, animations, formatters, and unit converters with copy-ready CSS.
Pickers, HEX/RGB/HSL converters, contrast checks, and palette extraction for UI work.
Compress, resize, convert, crop, and generate QR/barcodes or SVG cleanup in the browser.
Test, debug, and explain regular expressions with live matches and a cheat sheet nearby.
SQL/HTML formatters, minifiers, Markdown preview, syntax highlighting, and snippet diffs.
ISO 8601 and Unix timestamp converters, timezones, cron expressions, and date math — free online datetime tools.
Request testing, headers, status codes, webhooks, meta tags, and UTM builders for API work.
Build API requests and generate client code for cURL, Fetch, Axios, Python, and PHP.
Helpers for AI/MCP workflows: validate tool definitions and schemas locally in the browser.
DNS, IP, WHOIS, SSL, URL parsing, and related checks for deploy and domain debugging.
Number bases, measurement units, and CSV/Excel handoffs for everyday format changes.
Lorem ipsum, fake data, gitignore, licenses, READMEs, and starter configs for scaffolding.
Quick checks for emails, phones, accessibility hints, and related input sanity tests.
Responsive previews and small layout utilities for checking UI assumptions in the browser.
Percentage math and small numeric helpers for estimates and specs.
Inspect device, screen, and environment details from the current browser session.