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File & Developer Tools

Merge, split, convert and compress PDFs, images and data — all processed locally in your browser. Your files are never uploaded.

PDF, Image, File, Data & Developer Tools

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  • Local PDF Merge Tool
  • QR Code Generator
  • Barcode Generator
  • HEX RGB HSL Colour Converter
  • Colour Contrast Checker
  • Colour Palette Generator
  • Aspect Ratio Calculator
  • UUID Generator
  • Random Number Generator
  • Unix Timestamp Converter
  • HTML Encoder / Decoder
  • JWT Decoder
  • Regex Tester
  • Text Diff Checker
  • Markdown to HTML Converter
  • HTML to Markdown Converter
  • Cron Expression Parser
  • PDF Rotate Tool
  • PDF Rearrange Pages Tool
  • Delete PDF Pages Tool
  • PDF Page Counter & Size Checker
  • PDF Metadata Remover
  • Image DPI / Print Size Calculator
  • Base64 Encoder / Decoder
  • URL Encoder / Decoder
  • JSON Formatter & Minifier
  • CSV to JSON Converter
  • Word & Character Counter
  • Case Converter
  • Hash Generator
  • Line Sorter & Deduplicator
  • Image Resizer
  • Image Converter
  • Image Compressor
  • PDF Split Tool
  • Images to PDF Tool

100% Free

All tools are free to use. No sign up required.

Runs in Your Browser

No uploads. No data stored. Total privacy.

Works Offline

Most tools work without an internet connection.

Fast & Accurate

Built for professionals. Designed for speed.

Mobile Friendly

Fully responsive. Works on any device.

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Zerdly is currently in beta — we’re still getting things rolling, so please bear with us while we polish and add more tools.