30 free tools · no sign-up
Developer tools that run entirely in your browser.
Format, validate, encode, decode, generate and transform data instantly. No sign-up, no data leaving your browser for the core tools.
Popular tools
JSON Formatter
Format and indent JSON with clear, line-numbered error detection.
JSON Validator
Check whether a JSON document is syntactically valid.
JSON Viewer
Explore JSON as a collapsible, indented tree.
Base64 Encoder
Encode plain text into Base64.
JWT Decoder
Decode a JWT header and payload without verifying its signature.
UUID Generator
Generate a single random UUID v4.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text.
Regex Tester
Test a regular expression against a string with highlighted matches.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Categories
JSON tools
Format, validate, minify, diff and convert JSON directly in your browser.
Encoding & security
Encode, decode and inspect Base64, URLs and JWT tokens.
Generators & hashing
Generate UUIDs and cryptographic hashes like SHA-256 and MD5.
Regex & text
Test regular expressions, generate common patterns and compare text.
Date & time
Convert timestamps, Unix epoch values and build cron expressions.
Developer tools
Format SQL, YAML, XML, HTML and CSS.
All tools
JSON FormatterJSON ValidatorJSON BeautifierJSON MinifierJSON ViewerJSON DiffJSON to CSVCSV to JSONBase64 EncoderBase64 DecoderURL EncoderURL DecoderJWT DecoderJWT InspectorUUID GeneratorUUID Bulk GeneratorHash GeneratorSHA-256 GeneratorMD5 GeneratorRegex TesterRegex GeneratorText Diff CheckerTimestamp ConverterUnix Epoch ConverterCron Expression GeneratorSQL FormatterYAML ValidatorXML FormatterHTML FormatterCSS Formatter
How it works
- Open any tool page - each has its own URL and works standalone.
- Paste or type your data into the input panel.
- Run the operation and get an instant result, processed locally in your browser.
- Copy or download the output, or jump to a related tool.