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Merge PDF Files Online — Free

Combine multiple PDFs into a single document in seconds.

Merge PDF

Use this tool directly in your browser — no signup required.

Use Merge PDF

100% private — files are processed locally and never uploaded.

How to Merge PDF Files Online

  1. 1

    Add your PDFs

    Drop multiple PDF files into the tool. Add them in any order — you can rearrange after.

  2. 2

    Arrange the order

    Drag files to set the sequence. The first file becomes the first pages of the merged document.

  3. 3

    Merge and download

    Hit merge. The combined PDF downloads as a single file with all pages preserved.

Merging PDFs Without Trusting a Random Website

Most PDF merge tools require you to upload files to a server. That's fine for a restaurant menu, but not great for tax documents, contracts, or medical records. This tool merges entirely in your browser. Your files stay on your device.

The merged output preserves everything from the original files: hyperlinks, form fields, bookmarks, and embedded fonts. Page sizes can differ between files — the tool doesn't force everything to Letter or A4.

There's no limit on the number of files you can merge in one go. The practical constraint is your browser's memory. Merging twenty 5-page PDFs? No problem. Merging fifty 100-page scanned documents? You might need to batch those.

Frequently Asked Questions

Is there a file count limit?

No hard limit on file count. Memory is the constraint — most devices handle 20-30 files comfortably. For very large batches, merge in groups of 10.

Can I merge PDFs with different page sizes?

Yes. If one file is Letter and another is A4, both sizes are preserved in the output. Each page keeps its original dimensions.

Will the merged PDF be larger than the sum of the originals?

Usually it's slightly smaller. The merge process can deduplicate shared fonts and resources. At worst, it's roughly equal to the combined size.