DocsArcOpen DocsArc
Verified client-side processing

Your files never leave your device.Here’s the proof.

We don’t ask you to trust us — we show you. Every PDF operation runs inside your browser tab using open-source libraries you can inspect yourself.

Open DevTools. See for yourself.

The Network tab in your browser records every HTTP request. When you open a PDF in DocsArc, the XHR / Fetch filter shows nothing. No upload. No request. No data leaves your machine.

DevToolsNetworkConsoleSourcesRecording
🔍 FilterXHR / FetchDocWS
NameMethodStatusSize
viewGET2001.2 kB
pdf.worker.min.jsGET200318 kB
globals.cssGET2004.1 kB
✓ Zero outbound requests after page load
Opening, editing, measuring, and saving your PDF generates no network traffic.
Every byte of processing happens inside this tab.

Mockup based on Chrome DevTools. Open the real thing: F12 → Network → XHR — then open any PDF in DocsArc.

Zero server-side processing

Your PDF flows through open-source libraries running in your browser — there is no server path.

Your Browser — everything stays herepdf.jsKonvapdf-libYour PDF(never leaves)Output PDF(your device)No server path exists
Client-side rendering

pdf.js renders pages entirely in your browser. No pixel of your document is sent anywhere.

In-browser markup engine

Konva draws annotations on an HTML5 canvas inside your tab. Markups exist only in your session.

Local PDF writing

pdf-lib creates and modifies PDF bytes in-memory. The result is downloaded directly to your device.

PWA — Works Offline

DocsArc works with no internet connection.

Once loaded, DocsArc is a Progressive Web App (PWA) — every tool is cached in your browser. You can open, annotate, measure, and save PDFs on an airplane, in a basement, or behind a strict corporate firewall. If it can’t phone home, that’s proof there’s no phone-home behaviour.

Two ways to build a PDF tool

The architectural choice determines everything about privacy, speed, and trust.

The upload-based model

  • Your file travels over the internet to a server
  • Processing runs on hardware you don't control
  • A copy exists on someone else's infrastructure
  • Data retention depends on a privacy policy you have to trust
  • Requires a live internet connection for every action
  • A server breach can expose your documents

The DocsArc model — local-first

  • Your file never leaves your computer — not one byte
  • All processing happens in your browser using open-source libs
  • Nothing is stored anywhere except your own device
  • No privacy policy to memorise — there's nothing to leak
  • Works offline once loaded — no connection required
  • Nothing on our servers means nothing to breach

Verify the local-first claim yourself: open DevTools → Network tab → load a PDF → observe zero outbound requests.

Inspect the code yourself

DocsArc is built on open-source libraries with millions of weekly downloads. Every line that touches your PDF is auditable.

pdf.jsby Mozilla Foundation

Renders and parses PDFs entirely in the browser.

github.com/mozilla/pdf.js
pdf-libby Andrew Dillon

Creates, merges, splits and modifies PDFs — pure JavaScript, no server.

github.com/Hopding/pdf-lib
Konvaby Konva.js

Canvas-based 2D drawing engine powering all markup tools.

github.com/konvajs/konva
Tesseract.jsby naptha

OCR engine compiled to WebAssembly — runs locally in your tab.

github.com/naptha/tesseract.js

Convinced? Try it now — no account required.

7-day free trial. No credit card. Your files stay on your machine.

Open a PDF now