OnDevice Tools — 64 Free Browser Tools

SEARCH ALL 64

01 / SELECT A CHANNEL↔ ARROW KEYS

Choose a channel. Find your instrument.

02 / PICK YOUR TOOL01 ↗

Developer Tools

15 tools ready to open

01JSON FormatterFormat, beautify and validate JSON with 2 or 4 space indentation.02JSON ValidatorCheck whether a JSON document is valid and see exactly where it breaks.03JSON MinifierStrip whitespace from JSON and see how many bytes you saved.04JWT DecoderDecode the header and payload of a JSON Web Token and inspect its claims.05UUID GeneratorGenerate cryptographically random v4 UUIDs in bulk.06Regex TesterTest regular expressions live with highlighted matches and capture groups.07Cron Expression GeneratorBuild and explain cron schedules in plain English.08Base64 Encoder & DecoderConvert text to Base64 and back, with full Unicode support.09URL Encoder & DecoderPercent-encode and decode URLs, query strings and components.10HTML Entity EncoderEscape and unescape HTML entities to display markup safely.11Unix Timestamp ConverterConvert Unix timestamps to human dates and back, in UTC and local time.12Hash GeneratorGenerate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text or files.13SQL FormatterFormat SQL queries with consistent keyword casing and indentation.14XML FormatterPretty-print and validate XML documents with proper indentation.15YAML to JSON ConverterConvert YAML to JSON and back, with syntax checking.

QUICK
START ↗JSON Formatter QR Code Generator Image Compressor Text Compare

A MACHINE WITH A SIMPLE RULE

The work stays with you.

No file upload. No sign-up. Just 64 browser-based tools, with the processing happening on your own device. How privacy works ↗

OPEN
SOURCEBY DESIGN ↗

ONE BOOKMARK. EVERYDAY POSSIBILITIES.

Free browser tools for the work between the work.

OnDevice Tools brings 64 utilities together for developers, designers, writers and everyday problem-solvers. Format JSON, inspect a JWT, compare text, resize an image, generate a QR code or work out a percentage without opening a heavyweight application.

Building something? Explore JSON, XML, YAML and SQL formatters, a regex tester, encoding tools and hash generation. Design with CSS gradients, shadows, grid and flexbox generators, then check your colour contrast.

Getting everyday work done? Clean up text, count words, compress images, rearrange PDFs, convert units or calculate dates. Each tool includes practical explanations and examples, so you can understand the result as well as use it.

Tools are free for personal and commercial use. Individual tools may apply safety limits to keep your browser responsive. Advertising and optional contributions support the site; neither requires you to create an account.