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Upload, mark, send. Get documents signed in minutes.

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Free PDF Merger

Combine multiple PDF files into one, in any order you choose — free, and everything happens in your browser.

Drop a PDF here to upload

PDF files up to 50MB — processed entirely in your browser

Frequently asked questions

Yes, completely free with no account or sign-up required, and no limit on how many times you can use it.

No. Merging happens entirely in your browser using JavaScript — your PDFs are never sent anywhere.

Yes. Files are combined in the order they're listed — use the up/down arrows next to each file to reorder them before merging.

Up to 20 files per merge, each up to 50MB — plenty for combining a contract, ID scan, and cover page into one document.

No — each page is copied exactly as it appears in the source file, with no re-compression or quality loss.

This page just combines PDF files into one. SignFastAi's core product lets you upload a document, place signature fields on it, and send a secure signing link to get it signed.

Related guide

How to Merge PDF Files Online for Free

Combine multiple PDFs into one file in your browser — no software to install, no file uploaded to a server, and no watermark.

Need this merged PDF signed too?

SignFastAi lets you upload a document, mark where to sign, and send a secure link — no enterprise contract or sales call required.

Get started free