PDF Editor & Annotation Suite

Open, annotate, highlight and edit PDF documents entirely in your browser. No uploads, no cloud — your files stay on your device.

PDF Vault's editor lets you open, annotate, highlight, and edit a PDF entirely inside your browser, with the file never leaving your device.

Most free PDF editors are a web form in front of a server. You hand over the document, a machine you have never seen processes it, and a copy sits in third-party storage for hours. That is a poor trade for a contract, a medical record, or anything covered by a DLP policy at work.

This editor works differently. It renders and rewrites the PDF locally using WebAssembly, so you get annotation, text, highlighting, page manipulation, and export without a single byte crossing the network.

Nothing you do here is uploaded. The file is read into your browser's memory, processed by WebAssembly on your own machine, and written straight back to your downloads folder. You can confirm it yourself: open DevTools, switch to the Network tab, and run the tool — there is no request carrying your document, because there is no server endpoint to receive it.

How to edit a PDF online without uploading it

  1. Open the editor and drop your PDF onto the drop zone, or click to pick a file.
  2. Use the toolbar to add highlights, text, shapes, or freehand annotation on any page.
  3. Jump between pages with the thumbnail rail, and zoom to check placement.
  4. Click export to download the edited PDF. The original file on disk is untouched.

What you get

  • Annotate and highlight. Highlighting, freehand drawing, text boxes, and shapes, placed precisely at any zoom level.
  • Renders locally. Page rasterisation happens on your machine, so large documents open without an upload wait.
  • Works offline. Install PDF Vault once and the editor keeps working with your network disconnected.
  • No watermarks. Exports are clean. We do not stamp your document to advertise ourselves.

Frequently asked questions

Can I edit the existing text in a PDF?

You can add text, annotations, and shapes on top of any page, and you can delete, rotate, and reorder pages. Reflowing the original typeset text of a PDF is a different job — for that, convert to Word, edit there, and convert back.

Does the editor work on a phone or tablet?

Yes. The editor is responsive and runs in mobile Safari and Chrome. Very large scanned documents are more comfortable on a laptop simply because of available memory.

Is there a file size limit?

There is no server limit, because there is no server. The practical ceiling is your browser's memory — a few hundred megabytes on a typical modern laptop.

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