Developer Tools
Essential online tools for developers - encode, decode, generate, and convert
JSON Converter
Format, validate, and convert JSON online
Base64 Encode/Decode
Encode and decode text to and from Base64 format online
URL Encode/Decode
Encode and decode URLs and query strings online
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes online
UUID Generator
Generate random UUIDs (v4) instantly
Color Converter
Convert colors between HEX, RGB, and HSL formats
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Password Generator
Generate strong, secure passwords with customizable options
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal, and any base (2-36)
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) online
Regex Tester
Test regular expressions with real-time matching and group highlighting
Crontab Generator
Generate and parse cron expressions with visual builder
Markdown Preview
Live Markdown editor with side-by-side preview
JSON Diff
Compare two JSON objects and find differences
CSV Tools
Convert between CSV and JSON formats with table preview
SQL Formatter
Format, beautify, and minify SQL queries online
Code Formatter
Format and beautify HTML, CSS, JavaScript, and XML code online
Free Online Developer Tools
Our developer tools bring together the small utilities that programmers reach for many times a day, all in one fast, ad-light place. Instead of hunting for a random site every time you need to format a payload or decode a token, you can format JSON, encode and decode Base64 and URLs, generate hashes with the Hash Generator, and mint UUIDs from a single collection. Everyday debugging is covered too: the JWT Decoder reveals a token's header and claims, the Timestamp Converter translates Unix time to human dates, and the Regex Tester lets you experiment with patterns against sample text.
The suite also includes tools for shaping and tidying data and code. JSON Diff highlights what changed between two objects, CSV Tools and the SQL Formatter clean up tabular data and queries, and the Code Formatter beautifies source across many languages. Rounding things out are the Password Generator, Color Converter, Number Base Converter, Crontab Generator, Markdown Preview, and UUID Generator. Most of these run entirely in your browser, so API responses, tokens, and secrets stay on your machine.
Which developer tool should you use?
Choose based on the data in front of you. Working with an API response? Use the JSON Converter to format or validate it, JSON Diff to compare two versions, and the JWT Decoder to inspect a bearer token. Moving data between systems means Base64 for binary-safe strings and URL Encode for query parameters. For identifiers and secrets, reach for the UUID Generator and Password Generator, and use the Hash Generator to produce MD5 or SHA checksums. When you are cleaning things up, the SQL Formatter, Code Formatter, and CSV Tools tidy queries, source, and spreadsheets. Rounding out the set, the Regex Tester, Crontab Generator, Timestamp Converter, Number Base Converter, Color Converter, and Markdown Preview each solve a focused, everyday task.