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Developer Tools

JSON formatters, encoders, regex testers, and other everyday dev utilities.

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A free, one-stop library of browser-based tools — PDF today, with image, developer, and everyday utilities on the way. Every tool runs locally on your device: no signup, no uploads, no cost, now or ever.

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Open Tools Library is a free online tools website offering browser-based PDF tools — merge PDF, split PDF, and compress PDF — with image tools, developer tools, calculators, and more categories launching soon. No account, no installation, and no file ever leaves your device: everything runs client-side in your browser using open-source libraries.

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