Honestly, most online PDF mergers make you upload your files to their servers. That means someone else temporarily holds your documents — contracts, invoices, personal records, whatever they are. We think that's unnecessary. OfflinePDF merges your PDFs entirely inside your browser using the same technology your bank uses to run calculations locally. No file ever touches a server.

🔒 Zero Upload

Your PDFs are read directly in browser memory. The moment you close the tab, they're gone from our side — because they were never on our side.

⚡ Instant Processing

No waiting for upload progress bars or server queues. Merging happens at the speed of your device, not a shared server.

📂 Unlimited Files

Merge 2 files or 20 — there's no artificial limit. Drag to reorder before merging.

🆓 Completely Free

No account, no credit card, no "free tier" limits. Just open and use.

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 limits	None	Often 5–100 MB
Processing location	Your device	Their server

Frequently Asked Questions

Is there a file size limit for merging?

No — the only limit is your device's available memory. In practice, most machines handle hundreds of megabytes without breaking a sweat.

Does the merged PDF keep bookmarks and metadata?

Bookmarks and internal links are preserved where possible. Metadata from the first document is used as a base.

Can I reorder pages before merging?

Yes. Drag the file cards into any order before clicking Merge.