Most online converters and PDF tools upload your sensitive documents, API keys, and contracts to remote cloud servers. For private data, that is a security risk.
I built DevTol — a free suite of 126+ developer and productivity tools that execute 100% inside your browser using Web Workers and the Web Crypto API.
What is inside DevTol?
- Full Client-Side PDF Suite: Edit PDFs (with full Arabic RTL support), Compress PDFs locally (down to 100kb/200kb), Merge, and check Digital Signatures.
- Developer Utilities: JSON Diff & Formatter, JWT Decoder, Regex Sandbox, SQL Prettifier, cURL to Code Converter (7 languages).
- AI Token Calculator: Calculate prompt tokens and API pricing across GPT-4o, Claude 3.5, Gemini, and DeepSeek.
- Zero Tracking: 100% free, no account needed, and no files ever leave your machine.
Try it out here: https://devtol.online
What tools would you like added next? Feedback is welcome!
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