Can I merge password-protected PDFs?

No. PDFHaul cannot open or merge encrypted files. If you have the password and own the document, remove the password protection using a PDF editor first, then include the unlocked file in your merge.

What happens to digital signatures when PDFs are merged?

Any digital signatures in the source PDFs are invalidated by the merge. A digital signature is bound to a specific file's byte sequence. Combining files changes that sequence and breaks signature validity. Keep the signed originals separately if you need to verify the authenticity of the content.

Do footer page numbers update after merging?

No. Page numbers embedded in footers are part of the page content, written into the PDF when the document was originally created. PDFHaul does not modify page content during a merge. If one of your source documents has "Page 3 of 8" in the footer, it will still read "Page 3 of 8" regardless of where that page falls in the merged document. Fix this in the source application before converting to PDF.

What is the file size limit?

Each individual PDF can be up to 50MB. You can upload up to 50 files in a single merge job.

Can I reorder pages before merging?

Yes. After uploading your files, drag and drop them into any order before clicking merge. The final PDF follows the exact sequence you set.

Is it really free to merge PDFs?

Yes, completely free with no daily limits and no watermarks on the output. No subscription required.

Merge PDF Files Online

Combine multiple PDF documents into a single file in seconds. No software to install, no account required, and no files stored on our servers after you're done. Upload up to 50 PDFs at once, drag to reorder, and download your merged file instantly.

Drop your PDFs here

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Select PDF

Up to 50 MB

Enterprise-grade security

Files auto-delete

Free to get started

How to Merge PDFs

1
Upload your PDFs
Click the upload area above or drag and drop your PDF files. You can upload up to 50 files at once, each up to 50MB.
2
Arrange your files
Drag and drop your PDFs into the sequence you want. The order you see is the order they will be merged. Change your mind? Drag again before you click.
3
Merge and download
Click the Merge PDFs button and your combined document is ready to download in seconds. No watermarks, no signup required.

Why use PDFHaul
to merge PDFs?

No file size anxiety

Upload files up to 50MB each. Merge up to 50 PDFs in a single job without hitting limits mid-task.

Files deleted in 2 hours

Your documents are automatically purged from our servers within 2 hours. Not stored, not analysed, not sold.

Drag-and-drop reordering

Arrange your PDFs in exactly the right order before merging. Change your mind? Drag again before you click.

No watermarks, ever

Your merged PDF is clean. No branding, no watermarks, no trial version stamps on your documents.

Who uses
PDF merging?

Merging PDFs is one of the most common document tasks across almost every profession.

Legal & contracts

Combine signature pages, addenda, and exhibits into a single contract document before sending to a client or filing with a court.

Finance & accounting

Bundle monthly statements, invoices, or receipts into a single file for expense reports, audits, or client submissions.

Students & researchers

Consolidate journal articles, lecture notes, and references into one organised document for a project or dissertation.

Small businesses

Assemble proposals, portfolios, or onboarding packs by merging multiple documents into one professional PDF to send to clients.

What happens when you merge PDFs

Merging combines the page content of multiple PDFs into a single file in the sequence you specify. For simple documents the result is straightforward. For structured documents with internal features, there are specific behaviours worth knowing about before you start.

Bookmarks are not preserved. If your source PDFs have bookmark outlines (the navigation panel visible in Acrobat or Preview), these are not carried into the merged file. This is standard behaviour for browser-based merge tools. If navigation structure matters for the final document, you can add bookmarks manually in a PDF editor after merging.

Digital signatures are invalidated. A digital signature in a PDF is mathematically bound to the exact byte sequence of that specific document. Once the document is combined with other files, the byte sequence changes and the original signature no longer validates. If you need to demonstrate the authenticity of a signed document, keep the signed original and treat the merged file as an unsigned combined copy.

Footer page numbers do not update. If your source documents have page numbers printed in a footer ("Page 1 of 5" for example), those numbers are part of the page content, not metadata. After merging, a document originally labelled "Page 1 of 5" will still read "Page 1 of 5" even if it is now page 17 of a 40-page merged document. Update footers in the source application before converting to PDF if consistent page numbering matters.

Adobe Acrobat's merge preserves bookmarks by default and offers options to map page labels across source files. For documents where internal navigation matters, that additional control is useful. For documents being combined purely to send as a single attachment, the output is equivalent.

Frequently asked questions

Everything you need to know about merging PDFs

No. Bookmarks from the source files are not carried into the merged output. If you need navigation structure in the final document, add bookmarks manually in a PDF editor after merging. For documents being merged purely to send as a single file, this is rarely a concern.