SmallPDF.us

Merge PDF Files

Combine multiple PDF documents into one file, in the order you choose.

Select PDF Files to Merge

Drag and drop your files here or click to browse

PDF Format
Secure
Browser-based

Why Use Our PDF Merger

Combining PDFs shouldn't be complicated. We made it as simple as possible — no hidden settings, no gotchas.

Dead Simple to Use

Upload your PDFs, drag them into the order you want, and click merge. There are no settings to configure.

Nothing Gets Lost

Text stays sharp, images stay clear, links keep working, formatting stays perfect. We combine the files without touching the quality of anything inside them.

Happens Fast

Even if you're merging 20 big files, it only takes a few seconds. Upload, arrange, merge, download. The whole thing is done before you finish your coffee.

Your Files Stay Private

Everything is encrypted in transit. We process on secure servers and delete your files after an hour. We do not read your documents.

Works on Everything

Works in the browser on Windows, Mac, Android and iPhone. Nothing to install.

Free to start

The core tools are free. Upgrade for larger files and priority processing.

Three Quick Steps

Upload, reorder, merge

1

Upload Files

Select at least 2 PDF files. You can grab them all at once or add them one by one — whichever is easier.

2

Arrange Order

Drag the files around to put them in whatever order you want. The merged PDF will match this sequence exactly.

3

Merge & Download

Hit the merge button, wait a couple seconds, then download your combined PDF. Done.

When You Need to Merge PDFs

Instead of sending five separate files, send one clean document. People appreciate it.

Work

  • Combine invoices from the whole month into one tidy file
  • Send complete proposals with all supporting documents attached
  • Put together training manuals from separate sections
  • Bundle contracts and agreements with their amendments

Personal

  • Submit job applications with resume, cover letter, and references together
  • Keep all your tax documents and receipts in one organized file
  • Combine travel confirmations and tickets before your trip
  • Put together study materials and notes for easier reference

What actually happens when you merge

How page order, bookmarks and metadata are handled.

What order will my pages come out in?

Files merge in the exact order you arrange them before clicking merge — drag any file up or down in the list to reorder it. The page order inside each individual file stays untouched; only the order of the files themselves changes.

Merging PDFs with different page sizes

A4, Letter, and custom page sizes can all be merged into one file without any resizing or cropping — each page keeps its original dimensions and orientation. The output simply contains pages of mixed sizes back to back, exactly like the sources.

Merging password-protected PDFs

A PDF locked with an open password can't be merged until it's unlocked first, since we can't read pages we can't open. Run it through Unlock PDF, then merge — the merged file itself won't carry over the original password.

Merging scanned pages with digital documents

There's no technical difference between merging a scanned page and a digitally created one — both are just pages in a PDF. The only thing that changes is searchability: text in digital pages stays selectable, while scanned pages stay as images unless you run OCR separately.

Does the merged file size just add up?

Roughly, yes — the merged PDF is close to the sum of the source files, plus a small amount of overhead for the combined document structure. If the sources share embedded fonts or resources, the merged file can occasionally come out slightly smaller than the raw total.

What happens to bookmarks and metadata

Each source file's internal bookmarks are preserved and nested under that file's section in the merged PDF, so navigation still works. Document metadata like title and author isn't merged automatically — the combined file inherits it from whichever source is set as the base.

Common Questions

Quick answers about merging PDFs

Why Merge PDFs Together

Multiple PDF files are a pain to deal with. You've got to send them all separately, keep track of which one is which, and hope the person on the other end opens them in the right order. One merged file solves all of that at once.

Think about sending a project proposal. Without merging, you're attaching the main proposal, then the budget as a separate PDF, then the timeline, then maybe some references. That's four files minimum. With merging? One file. Everything's in order, nothing gets lost, looks way more professional.

Who Uses This

Office workers combine monthly reports. Students merge research papers with citations. Freelancers bundle invoices with contracts. Real estate agents put together listing documents. Lawyers assemble case files. Anyone who deals with multiple PDFs regularly ends up needing to merge them at some point.

Merge Your PDFs

Free for up to 2 files at a time. Files are deleted after an hour.