Professional Document Power, Total Privacy

A high-performance suite of professional PDF tools that runs 100% in your browser. No file uploads, no data harvesting—just lightning-fast document handling without the cloud risk.

Privacy First

Professional Editor

Modify text, insert images, and refine layouts with total confidence. Professional tools with ZERO tracking.

 Fast Sync

Intelligent Merger

Combine multiple PDF documents into one seamless file instantly. Drag, drop, and you're done.

 Precision

Smart Splitter

Extract specific pages or break down massive documents into smaller, manageable files with ease.

 Instant

Visual Rotator

Fix crooked scans and orientations in bulk. A simple, visual way to get your PDF looking perfect.

 HD Quality

Lean Compressor

Reduce file size for emails or storage while maintaining extreme text and image clarity.

 High Fidelity

Image to PDF

Convert your photos and scans into professional PDF documents in high-resolution.

 WebP Support

PDF to Image

Transform your PDF pages into vibrant, editable image files for presentations and sharing.

 AI Powered

Deep OCR Engine

Our high-accuracy engine makes scanned text searchable and selectable in seconds.

 Military Grade

Shield & Lock

Add bank-grade passwords and encryption to protect your sensitive documents.

 Docx Support

PDF to Word

Convert complex layouts into editable Word documents with pixel-perfect accuracy.

 Anonymizer

Metadata Scrub

Sanitize your PDFs by wiping hidden GPS, author info, and tracking tags instantly.

 Canvas Mode

Page Master

Reorder, delete, or duplicate pages in a visual drag-and-drop workspace.

 High Security

Smart Redaction

Physically wipe sensitive PII and data from document text permanently.

 AI Insights

AI PDF Chat

Ask questions and get instant summaries from long documents using local AI.

 Business Pro

e-Sign & Form

Sign documents and fill out interactive forms with 100% local signatures.

 System Fix

Flatten & Repair

Fix corrupted headers and flatten complex layers for perfect printing.

 Data Scan

Data Extractor

Detect and export PDF tables directly to clean Excel or CSV spreadsheets.

 Brand Shield

Watermark Studio

Add custom text or image branding to every page with transparency control.

 Eco Friendly

Eco Ink Saver

Convert color PDFs to grayscale to reduce carbon footprint and printing costs.

 Legal Suite

Bates Stamping

Sequential page numbering for legal discovery and professional filing.

 Visual Diff

Visual Diff

Compare two versions of a contract and see exactly what changed side-by-side.

 Accessibility

Voice to PDF

Dictate your thoughts directly into a professional document format flawlessly.

 Auto Heal

Scan Healing

Auto-crop and deskew crooked photos of documents for pro-grade scans.

 Long Term

PDF/A Expert

Convert documents to international standard archival format for long-term storage.

How it works.

Simple, secure, and entirely in your browser.

Local Processing
client_contract.pdf
AI Sanitizing...
Success! Ready for download
End-to-End Encryption
01

Local Selection

Select your files directly from your device. Our engine parses the data instantly without ever sending a single byte to a server.

Zero Uploads Multi-File Support
02

Smart Processing

Our high-performance WASM engine handles the heavy lifting locally. Edit, merge, or encrypt with desktop-level speed.

128-bit AES Pixel Perfect
03

Verified Output

Preview your changes and download the finalized document. Your original file remains untouched on your disk throughout.

Instant Auth Auto-Purge Cache

Premium Performance as Standard

Lightning Response

Sub-15s processing for
most documents.

Zero-Trace Security

Automated deletion after 24h
or instant manual purge.

Global Trust

Processing millions of
requests every month.

Frequently Asked Questions

Common questions about home and how it works.

Is OncePDF really free to use?

Absolutely. We believe that professional document tools should be accessible to everyone without hidden costs. Our core suite of tools—including editing, merging, and compression—is 100% free, and you don't even need to create an account to get started.

How does OncePDF protect my privacy?

OncePDF is built with a 'Privacy-First' philosophy. Unlike traditional online PDF editors that require you to upload your sensitive files to their servers, OncePDF processes your documents directly in your web browser. This means your files never leave your device, ensuring total confidentiality and peace of mind.

Do I need to install any software or extensions?

No installation is required. OncePDF is a high-performance web application that runs on any modern browser across Windows, Mac, Linux, and mobile devices. You get the power of desktop software with the convenience of a website.

Is there a limit on how many files I can process?

We offer generous free limits designed for everyday professional and personal use. Most users will find our free tier perfectly sufficient for their needs, with no aggressive daily caps on basic document tasks.

Still have questions? Our support team is here to help you.

Contact Support