Developer Tools
Tools for coding, formatting, and debugging.
JSON Formatter
Format, validate and minify JSON with line-and-column errors and a tree view. Runs in your browser.
Base64 Encoder/Decoder
Encode text or files to Base64 and decode it back to text or files, including URL-safe Base64.
URL Encoder/Decoder
Encode and decode URLs and query values, and see a link's parameters in a table.
JWT Decoder
Decode JWTs to read claims and expiry, and check HS256 signatures, without sending the token anywhere.
Regex Tester
Test JavaScript regular expressions live: highlighted matches, capture groups and a replace preview.
Diff Checker
Compare two texts or code files side by side, with changed words highlighted and a downloadable patch.
UUID Generator
Generate random v4 or time-ordered v7 UUIDs in bulk, and inspect any UUID's version and time.
Hash Generator
Get MD5, SHA-1, SHA-256 and SHA-512 hashes of text or files, and verify file checksums.
CSS Minifier & Beautifier
Minify or beautify CSS and see the size saved. Strings, url() and licence comments are kept.
SQL Formatter
Format and beautify SQL in 20 dialects, with uppercase or lowercase keywords.
Cron Expression Builder
Build and check cron schedules, read them in plain English and see the next run times in IST or UTC.
Unix Timestamp Converter
Convert Unix epoch timestamps to readable dates and dates back to timestamps, in IST, UTC or any time zone.
Color Contrast Checker
Check text and background contrast against WCAG 2.2 AA and AAA, or test a whole palette as a matrix.
API Request Tester
Send GET, POST, PUT, PATCH or DELETE requests with headers, auth and a body; see the status and response.
Chmod Permissions Calculator
Convert Linux file permissions between octal (755), symbolic (u=rwx) and ls -l, and copy the chmod command.
User Agent Parser
Read a User-Agent string: browser and version, OS, device type, engine and bots, with JSON output.
IPv4 Subnet Calculator
Find the network, broadcast, host range, masks and address type of an IPv4 subnet, and split it.
.htaccess Generator
Generate Apache .htaccess rules for HTTPS and www redirects, IP blocking, compression, caching and 301s.
YAML Validator & Formatter
Validate YAML, convert YAML ↔ JSON and re-indent YAML as you type. Supports multi-document files.
HTML Entity Encoder
Encode and decode HTML entities, and turn an email address into a spam-resistant mailto: link.
Windows Context Menu Builder
Create .reg files that add your own items to the Windows right-click menu, with a matching uninstaller.
Keep PC Awake Script (Anti-AFK)
Create a Windows script that keeps your PC awake and the screen on for a set time, with clear stop steps.
SQL Playground
Run SQL in an in-browser SQLite database with sample tables. Open and download .sqlite files.
JSON to TypeScript
Generate TypeScript interfaces or types from JSON, with optional and nullable fields detected.