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OpenPDF

Read PDFs and use 11 tools to merge, edit, sign and compress them for free. PDF processing runs in your browser, without signup or watermarks.

  • View, merge, split, annotate, sign, compress, watermark, organize, add images and fill forms
  • PDF processing runs in your browser — optional services can require network access
  • No signup or watermarks

OpenPDF combines a PDF reader with 11 browser-based tools for organizing, editing, filling, signing and compressing PDFs. Processing runs locally through browser APIs and the PDF libraries used by the app. The browser, device and operation determine practical limits, and optional services may require a network connection.

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?

PDF processing runs in your browser with pdf-lib and related WebAssembly libraries, so the document content is not uploaded for processing. Optional services such as timestamping or public certificate retrieval may need a network connection.

What limits should I expect?

Limits depend on the operation, the PDF and the browser/device resources available. Large files may take longer or fail locally; the tool shows an error when an operation-specific limit is reached.

Does it work offline?

After the app resources required for a route have been cached, some local operations may work without a network connection. The first load and optional services such as timestamping or certificate retrieval require connectivity, so offline availability depends on the cache and operation.

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 where PDF document processing runs in the browser using WebAssembly and modern JavaScript APIs. The toolkit includes merge, split, sign, organize, annotate, compress, watermark, page numbers, add image and fill forms. Practical limits depend on the operation, document and device. The page source and privacy policy describe consent controls, analytics, advertising and optional services before you use the tool with sensitive documents.

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