Free Online Developer Tools
Fast, private, browser-based tools for developers. No signup required. Your data never leaves your browser.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting and error detection.
Base64 Encoder / Decoder
Encode text or files to Base64 and decode Base64 strings back to their original form.
URL Encoder / Decoder
Encode and decode URLs with percent-encoding. Handles special characters and query strings.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or file input.
Regex Tester
Test regular expressions with real-time matching, group highlighting, and flag support.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and expiration details.
Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Diff Checker
Compare two blocks of text side by side and see additions, deletions, and changes.
Color Converter
Convert colors between HEX, RGB, and HSL formats with a live preview swatch.
Code Beautifier
Format and beautify HTML, CSS, JavaScript, and SQL code with customizable indentation.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
CSS Minifier
Minify CSS by removing whitespace, comments, and unnecessary characters to reduce file size.
HTML Entity Encoder
Encode special characters to HTML entities or decode them back.
Chmod Calculator
Calculate Unix file permissions.
Cron Expression Parser
Parse and explain cron job schedules.
JSON Path Tester
Test JSONPath expressions against data.
Markdown Preview
Live preview Markdown as rendered HTML.
SQL Formatter
Format and beautify SQL queries.
YAML Validator
Validate YAML syntax and structure.