Skip to content

OpenPDF

OpenPDF bundles 10+ browser-based PDF tools — view, merge, split, annotate, sign, compress, organize. 100% local processing, no signup, no watermarks.

OpenPDF bundles 10+ everyday PDF operations — viewing, merging, splitting, annotating, signing, compressing, watermarking and organising pages — into a single browser-based toolkit. Every operation runs locally through pdf-lib and related WebAssembly libraries, so your files never touch a server. No account, no subscription, no watermarks, no file-size caps beyond what your device can hold in memory.

Common use cases

  • Running a quick merge, split or signature on a PDF without creating an account or downloading desktop software.
  • Handling sensitive documents (contracts, IDs, bank statements) that must never leave the device.
  • Replacing an ad-hoc mix of single-purpose PDF web tools with one local toolkit covering the common tasks.
  • Giving a team a privacy-safe PDF editor that works on any laptop through a browser with no install.

Frequently asked questions

Does OpenPDF upload my files?

No. Every OpenPDF tool runs entirely in your browser using pdf-lib and related WebAssembly libraries. Your PDFs never leave your device and nothing is stored on a server.

Is there a file-size limit?

There is no imposed server-side limit because nothing is uploaded. Local processing is only bounded by your browser and device memory — very large files (several hundred MB) may take longer but still run locally.

Does it work offline?

OpenPDF is a Progressive Web App. After first load, it caches its assets and continues to work without a network connection. Your files are processed locally in either case.

What formats does OpenPDF support?

OpenPDF accepts standard PDF files. For image inputs, pair it with the add-image tool. For office formats like DOCX, convert first with a dedicated tool — OpenPDF focuses on PDFs that are already PDFs.

Why OpenPDF

OpenPDF is an independent project built around one principle: the PDFs you edit should never leave your device. Every tool — merge, split, sign, organize, annotate, compress, watermark, add page numbers — runs entirely in your browser using WebAssembly and modern JavaScript APIs. There is no upload step, no account, no email harvesting, and no premium tier gating the useful features. The codebase and the third-party scripts loaded for analytics and advertising are visible in the page source — Google AdSense and Google Analytics 4 load only after you accept cookies in the consent banner — so anyone can audit what is running before trusting the tool with sensitive contracts, scanned IDs, or financial documents.

By · Last updated: