Zero uploads · Zero server · Zero compromise

The PDF suite
that never sees
your files

Name: PDF Tools — PDFZero
Rating: 4.9 (1284 reviews)
Author: PDFZero

25+ professional PDF tools processed entirely inside your browser. Merge, OCR, sign, redact — without a single byte leaving your device.

Start for free →

How it works

Live tools

Server uploads

∞

File size limit

OCR languages

Zero server contact

Your files stay on
your machine

Every competitor uploads your contracts and medical records to someone else's server. We run everything in-browser — even our own servers have never seen your data.

⚡

WebAssembly engine

PDF-lib, Tesseract compiled to WASM. Near-native speed, zero network.

🧵

Web Worker isolation

Heavy work runs in background threads. UI stays silky on 2 GB files.

📶

Offline-first PWA

Install as app. Works on planes, air-gapped machines, courtrooms.

What actually happens

📂

You pick a file

Browser File API — stays in RAM

🧵

Dispatched to Web Worker

UI thread never blocked

⚙️

WASM processes your file

pdf-lib / Tesseract / Ghostscript

⬇️

Result streamed back

Zero-copy ArrayBuffer transfer

🚫No network request was made. Your file never left this device.

Why PDFZero

What legacy players
can't replicate

In-browser OCR, 100+ languages

Tesseract.js in a Web Worker — no cloud API, no per-page billing, no data leaving your device.

AI-powered

True local signatures

Draw, type, or upload. Embedded with pdf-lib without touching any external service.

Always free

No file size cap. Ever.

iLovePDF: 100 MB cap. Smallpdf: 5 files/day. Us: your RAM is the limit — typically 4–16 GB.

Always free

Web Worker architecture

All WASM work runs in background threads. The UI never freezes — even during 500-page OCR.

Always free

AI redaction of PII

Auto-detect and permanently blackout emails, Aadhaar, passports. For legal, HR, healthcare.

Live now

Offline as a feature

Install as a PWA. Works in flight, in a hospital air-gap, in a courtroom — zero connectivity needed.

Always free

100% Free · Forever

Donate to keep us
innovating. respecting privacy. protecting your data. building free tools.

Every PDFZero tool is completely free — no paywalls, no limits, no account. We don't sell your data because we never see it. If our tools saved you time, a small donation keeps us building more.

✓All 25 tools free ✓Unlimited file size ✓No account ever ✓Works offline ✓Zero data collection

Browse tools →

🔒 Secure payments via Razorpay · Built with care for your privacy

♥

✦

Built for enterprises that can't afford data leaks

Deploy PDFZero on your private intranet. Air-gapped, self-hosted, white-labeled. Client-side processing means near-zero infrastructure overhead.

🔒 Air-gapped 🏷️ White-label 📋 Audit logging 🔑 SSO / SAML ♾ Unlimited users

Contact sales →

The PDF suite that never sees your files

Everything you need.Built for privacy. speed. offline. your eyes only. zero uploads.

Your files stay onyour machine

What legacy playerscan't replicate

Donate to keep us innovating. respecting privacy. protecting your data. building free tools.

Built for enterprises that can't afford data leaks

The PDF suite
that never sees
your files

Everything you need.
Built for privacy. speed. offline. your eyes only. zero uploads.

Your files stay on
your machine

What legacy players
can't replicate

Donate to keep us
innovating. respecting privacy. protecting your data. building free tools.