How DearPDF works
Every tool processes your file in this browser. Open a document, make the change, download the result — without sending the PDF to DearPDF servers.
The 3-step pipeline
- 0 bytes sent01
Open on this device
You pick a file with your browser. It is read into this tab’s memory — not posted to a conversion API.
- Local processing02
Edit in your browser
Merge, compress, OCR, and the other tools run locally on your CPU. Heavy work stays on-device.
- Instant download03
Download the result
The finished PDF is saved from a local download link. Close the tab and the working copy is gone.
- Upload file to a remote server
- Wait for server processing
- Download from a temporary link
Your document leaves your device.
- Open file in this tab
- Process locally in the browser
- Save result from a local download
Document stays on this device.
FAQ
Plain answers about private, in-browser PDF tools.
Can DearPDF see my confidential documents?
No. Document bytes are not uploaded to DearPDF servers for conversion. Processing happens in your browser tab.
Does it work offline?
After the first visit, core tools can keep working offline via the app’s cached assets.
Is there a file size limit?
There is no artificial paywall limit. Very large files are constrained only by your device memory.
What powers the tools?
Browser-native libraries (including WebAssembly engines) for PDF, images, and OCR — all running locally.
Want the full privacy model? Privacy Architecture.