Professionally Edit PDF Text & Layouts
Modify text, adjust layouts, and annotate documents with total confidence. Your sensitive files never leave your browser's secure environment.
Select a PDF to start editing
or drag and drop your file here
Precision Editing Without the Data Risk
Editing a PDF shouldn't involve compromising your privacy or waiting for slow server response times. OncePDF provides a full-featured, professional editing suite that runs natively in your browser. You can change text content, add shapes, insert high-resolution images, and manipulate layout elements with the same precision as desktop software, but with the immediate convenience of a modern web interface.
Because we utilize client-side WebAssembly technology, every single edit you perform happens locally in your system's memory. Your sensitive information is never transmitted across the web, making OncePDF the ideal choice for editing business contracts, confidential medical records, or sensitive manuscripts. We've optimized our engine to handle even massive, multi-megabyte PDFs with zero lag, ensuring your workflow remains as fluid as it is secure. Discover a faster, safer way to refine your documents.
100% Private
Fast Local Processing
GDPR Ready
100% Private
Files never leave your device. All processing happens locally in your browser.
Blazing Fast
Instant rendering and editing. No waiting for server uploads or downloads.
Rich Annotations
Full suite of tools: Pencil, Highlight, Shapes, Images, and more.
Document Layout Manager
Precision Page Organization
Drag to reorder. Use icons to rotate, duplicate, or delete.