Every major PDF merging service asks you to upload your files. That creates a window — however brief — where your documents exist on hardware you don't control. For contracts, medical records, or anything sensitive, that's a real risk. OfflinePDF never opens that window. Your PDFs are read directly into your browser's memory using the JavaScript File API, the same way a desktop app reads a file. Nothing is transmitted.

🔒 Zero Upload Risk

Your files are loaded into browser RAM, not sent anywhere. Close the tab and they're gone — no cleanup needed on our end because nothing was ever stored.

⚡ No Queue, No Wait

Server-based mergers process one job at a time. Your browser runs the merge immediately, using your CPU and memory at full speed.

📂 Any Number of Files

Merge two files or twenty. Drag the cards to set the order before merging.

🆓 Permanently Free

No account, no free tier, no file size cap enforced by us. The only limit is your device's RAM.

OfflinePDF vs Typical Online Tools

Feature	OfflinePDF	Typical Online Tools
No file upload required	✓	✗ (most)
Works offline after first load	✓	✗
No account needed	✓	✗ (many)
File size limit	None	5–100 MB (typical)
Processing location	Your device	Their server

Frequently Asked Questions

Is there a file size limit?

No artificial limit exists. The constraint is your device's available RAM. In practice, most machines handle several hundred megabytes without issue.

Can I reorder PDFs before merging?

Yes. Drag the file cards into the order you want before clicking Merge.

Are bookmarks preserved?

Internal links and bookmarks are carried over where the source PDFs embed them. Metadata from the first document is used as the base.