Tool category
Developer Tools
Client-side formatters, validators, encoders, generators, and color helpers.
20 matching tools
JSON Formatter
Format and pretty-print JSON directly in your browser.
JSON Validator
Validate JSON and see clear parsing feedback.
Base64 Text Encoder / Decoder
Encode UTF-8 text to Base64 or decode Base64 back to UTF-8 text.
File to Base64 Converter
Choose any local file, detect its MIME type, and convert it to raw Base64, a Data URL, JSON, HTML, or CSS.
Base64 Previewer
Decode Base64 or a Data URL, detect the MIME type from its bytes, preview supported content safely, and download the reconstructed file.
JSON to C#, Python & Dart Class Generator
Turn a JSON object or array into typed C#, Python, or Dart models with nested classes, nullability, JSON mappings, and separate-file exports.
JWT Decoder & Expiration Checker
Decode a compact JWT header and payload, then check exp, nbf, iat, claim types, and time ordering against your device clock.
WhatsApp Inquiry Link Generator
Create a wa.me link for an international WhatsApp number with an optional editable opening message.
URL Encoder / Decoder
Encode URL parameters while preserving complete URLs, or decode nested URLs into readable parameters.
UUID Generator
Generate browser-side UUID v4 identifiers.
Color Converter HEX / RGB / HSL
Convert colors between HEX, RGB, and HSL formats.
Password Generator
Generate random passwords, memorable passphrases, and PINs locally with strength feedback.
Markdown Editor and Preview
Write and revise Markdown with toggle formatting, undo and redo, live GFM preview, full-screen editing, and .md download.
Markdown Table Generator
Build Markdown tables in a spreadsheet-style editor, import structured data, preview GFM, and copy or download the result.
AI Token Cost Calculator
Estimate prompt tokens, cached input, context usage, and AI model costs across providers locally.
QR Code Generator
Create styled QR codes for URLs, calls, contacts, Wi-Fi, WhatsApp, and social profiles.
AI Agent Instructions Generator
Build, edit, validate, preview, and download AGENTS.md, CLAUDE.md, Cursor rules, and SKILL.md locally.
robots.txt Generator
Build, edit, validate, and test robots.txt rules for search engines, AI discovery, model training, and user-requested agents.
Schema Markup Generator
Build or check JSON-LD for 14 practical schema types with guided fields, live validation, examples, and official testing links.
Open Graph Generator & Social Preview
Create Open Graph and X Card tags while comparing live Facebook, X, LinkedIn, WhatsApp, Slack, and Discord previews.