As developers, we constantly need quick utilities — decode a JWT, format some JSON, test a regex, generate a QR code. Here's a collection of free tools that work instantly in your browser, with no signup or installation required.
🔧 Code & Data Tools
1. JSON Formatter & Validator
Paste messy JSON and get it beautifully formatted with syntax highlighting. Features: format, minify, sort keys, tree view, and error detection with line numbers. 100% client-side — your data never leaves your browser.
2. JWT Decoder
Paste any JSON Web Token to instantly decode header, payload, and all claims. Automatically checks expiration and shows human-readable timestamps. Perfect for debugging auth issues.
3. Cron Expression Generator
Build crontab schedules visually instead of memorizing syntax. Click presets for common schedules, get human-readable descriptions, and preview the next 5 run times.
4. Regex Tester
Test regular expressions in real-time with match highlighting, capture groups, and code generation for multiple languages.
5. Base64 Encoder/Decoder
Quickly encode or decode Base64 strings. Supports text and file input.
🖼️ Media & Visual Tools
6. Screenshot API
Capture any website as an image or PDF via API. Free tier includes 100 screenshots per month. Also available as a web tool — just enter a URL and download the screenshot.
7. QR Code Generator
Generate QR codes from any text or URL via API. Returns PNG or SVG. Free tier includes 200 QR codes per month. Try it — just change the data parameter.
8. OG Image Generator
Generate beautiful Open Graph images for social media previews via API. Customize title, subtitle, and theme. Perfect for dynamic social cards in your blog or SaaS.
🔗 Web Tools
9. URL Shortener
Shorten URLs with click analytics. Free tier includes 50 links with full analytics: clicks, referrers, countries, and devices.
10. SEO Checker
Audit any website's SEO with 15+ checks: title tags, meta descriptions, OG tags, structured data, heading hierarchy, alt text, and more. Get a score and actionable recommendations.
🔒 Security Tools
11. Password Generator
Generate strong, random passwords and passphrases. Customize length, character types, and separators. 100% client-side.
💰 Business & Finance Tools
12. Invoice Generator
Create professional PDF invoices with automatic VAT calculation. Supports Icelandic kennitala and international formats.
13. Currency Converter
Convert between 14 currencies with live exchange rates. ISK-centric but works for any currency pair.
📖 Documentation & APIs
14. Developer Hub
Central documentation for all Pandan APIs. Includes Postman collection, OpenAPI specs, and getting-started guides.
15. API Key Portal
Get a free API key for all Pandan APIs in seconds. One key works across screenshot, QR code, link shortener, and more.
Why Free?
All tools are free to use with generous limits. We offer paid tiers for high-volume API usage, but the free tools are fully functional with no artificial limitations. Our goal is to build the best developer toolkit on the web.
Built by Pandan 🐼 — All tools run on a single VPS with Node.js. Read the story of how we built 10+ products in 48 hours.