Merge PDF

Combine multiple PDF files into one — free, fast, no signup

Supports up to 2,000 pages combined (files up to 700 MB total). Merging runs in the background — this tab stays responsive.

Click to add PDF files

About Merge PDF

Merge PDF is a free online tool that lets you combine multiple PDF files into a single document instantly. No software installation required, no signup, and your files are processed locally in your browser for maximum privacy — merging runs in a background Web Worker so the page stays responsive. Perfect for combining reports, contracts, invoices, and any other PDF documents.

How to use Merge PDF

1Click the upload area and select two or more PDF files from your device.
2Reorder the files by clicking the up and down arrows next to each file.
3Click the Merge PDFs button to combine all files into one.
4Download your merged PDF file once it's ready.

Frequently Asked Questions

Is Merge PDF free to use?

Yes, completely free with no signup required.

Are my files safe?

Yes. All processing happens directly in your browser, in a background Web Worker — your files are never uploaded to any server.

How many PDF files can I merge at once?

Up to 2,000 pages combined and 700 MB total on desktop (300 pages / 100 MB on phones and tablets) -- measured limits to keep merging reliable in the browser tab, rather than risking a crash on a very large combined document. Split larger jobs into batches and merge the results together.

Does merging PDFs reduce quality?

No. The merged PDF retains the full quality of all original files including images, fonts, and formatting.

Tips & Tricks

✓Drag files in the list to reorder them before merging.
✓You can merge scanned PDFs, form PDFs, and regular text PDFs together.
✓For large files, the merge may take a few seconds — the progress bar tracks each file as it's added.
✓After merging, use our PDF Compress tool to reduce the file size if needed.