Developer Tools
Browse free online Developer Tools on tomai — fast, private, no installation, available in 11 languages.
Free tools
FreeJSON Formatter
Format, validate, minify and sort JSON — 100% in your browser
Base64 Encode / Decode
UTF-8 safe Base64 with URL-safe variant and file support
UUID Generator
Bulk UUID v4 & time-ordered v7 (RFC 9562), client-side
Hash Generator
MD5, SHA-1, SHA-256, SHA-512 & CRC32 with HMAC and checksum verification
JWT Decoder & Verifier
Decode JSON Web Tokens and verify HS/RS/ES/PS signatures — fully in your browser
Unix Timestamp Converter
Convert epoch time to a date and back — seconds, millis, micros & nanos
Regex Tester
Test regular expressions live with match highlighting, groups and replace
Bcrypt Generator
Hash passwords with bcrypt and verify them — in your browser
AES Text Encryptor
Lock text with a password using AES-256-GCM — decrypt it back anytime
TOTP Authenticator
Live 2FA codes from any base32 secret — no app needed
HTTP Status Codes
Every status code explained — search 200 to 511 in seconds
URL Parser
Split any URL into protocol, host, path, params and hash
Base Converter
Integers across binary, octal, decimal, hex, base32 and base36
JSON Diff
Compare two JSON documents key by key — added, removed, changed
Chmod Calculator
Unix permissions both ways — 755, rwxr-xr-x and checkboxes
Keycode Info
Press any key — see its key, code and keyCode instantly
RSA Key Pair Generator
Mint RSA-OAEP 2048/4096 key pairs with PEM export — in your browser
Random Address Generator
Plausible test addresses for 50+ countries, in each one's own language — for QA, demos and form testing
JSON to CSV
Convert a JSON array of objects into table-ready CSV
CSV to JSON
Parse comma-separated data into clean JSON objects
JSON to YAML
Convert JSON data into clean, quoted-safe YAML
XML to JSON
Convert XML documents into clean, predictable JSON
HTML Encoder / Decoder
Encode and decode HTML entities and special characters
Cron Expression Generator
Build, validate and preview cron schedules with live next-run times
HTML CSS JS Minifier
Shrink HTML, CSS and JavaScript for faster pages
Color Converter
Convert colors between HEX, RGB, HSL, HSV and CMYK
Code Beautifier
Format and minify HTML, CSS, JavaScript, XML, YAML and SQL in your browser.