Merging PDFs is one of those small, constant tasks — combining a cover letter and a resume, stitching together scanned pages from three separate emails, assembling a set of invoices into one file for an accountant — that shouldn’t require installing anything, and doesn’t. It’s a browser upload and a download, free, no account needed to try it.
How to Merge PDF Files
- Open AllMediaTools’ PDF merger.
- Upload the PDFs you want to combine — add as many as you need in one go.
- The files are merged in the order you uploaded them, so add them in the sequence you want the final document to read.
- Download the single, combined PDF.
That’s the whole process. No watermark gets added to the result, and no email address is required to run it — anonymous use is available with a rate limit, and a free account raises that limit if you’re merging PDFs often.
Getting the Order Right
Since the merged document follows upload order, the easiest way to avoid a re-do is to sort your files in the right sequence before uploading — rename them with a leading number (01-cover.pdf, 02-resume.pdf, 03-references.pdf) if your file manager doesn’t sort them the way you want by default. If you do end up with pages in the wrong order after merging, AllMediaTools also lets you reorder its pages afterward without starting over from scratch.
What If Some of Your Files Aren’t PDFs Yet?
It’s common to end up with a mix — a couple of actual PDFs plus a few photos of receipts or a scanned signature page as JPGs. The merge tool expects PDF inputs, so convert any standalone images into PDFs first using AllMediaTools’ JPG to PDF converter, then merge those converted files alongside your existing PDFs in whatever order you need. This two-step approach handles the “half my documents are photos, half are already PDFs” situation cleanly without needing a separate tool that claims to merge mixed file types directly.
Merging From a Phone or Tablet
Since the tool runs entirely in the browser, it works the same way on mobile as it does on desktop — there’s no separate app to install. Upload files from your phone’s file picker or camera roll instead of dragging and dropping, and the rest of the process (order, merge, download) is identical. This matters more than it sounds for the common case of merging scanned pages you just photographed with your phone, since the whole workflow — photograph, convert to PDF if needed, merge — can happen without ever touching a computer.
Common Reasons People Merge PDFs
| Use case | Why merging helps |
|---|---|
| Job applications | Combine a cover letter, resume, and references into one attachment instead of three |
| Scanned paperwork | Stitch together pages scanned separately (or from multiple emails) into one document |
| Invoices and receipts | Bundle a month or year of individual PDFs into a single file for bookkeeping or an accountant |
| Reports and appendices | Attach supporting documents to a main report without juggling multiple attachments |
| Contracts and signatures | Combine a signed signature page back into the original contract document |
Double-Check Before Sending Anything Official
For casual merges (bundling personal photos, combining notes for yourself) a quick glance at the result is plenty. For anything going to an employer, a court, a bank, or another party where page order actually matters legally or procedurally — a signed contract with exhibits, a court filing with numbered attachments — open the merged file and confirm every page landed where you expected before sending it anywhere. A merge tool faithfully does what you told it to do; it has no way to know if you queued the files in the wrong order to begin with.
After Merging: Check the File Size
Combining several PDFs, especially ones with embedded images or scanned pages, can produce a file that’s noticeably larger than any single input — sometimes large enough to bounce off an email attachment limit. If that happens, compress the merged file afterward; it downsamples embedded images without needing to redo the merge. Why PDFs get so large explains what’s usually driving that size up if the result surprises you, and compressing it afterward covers the settings in more depth.
Frequently Asked Questions
Is there a limit to how many PDFs I can merge at once?
The tool accepts multiple files per merge; very large batches or very large individual files may run into the same rate limits that apply to anonymous use generally. A free account raises those limits if you’re regularly merging large batches.
Does merging add a watermark to the result?
No — the combined PDF has no watermark or branding added.
Can I merge password-protected PDFs?
You’d need to remove the password from any protected file first, using a password you already know — the merge tool works on the document content directly and expects it to be accessible.
Will merging change the formatting or quality of the original pages?
No — each page is carried over from its source PDF as-is; merging doesn’t re-render, recompress, or reformat the content of any page.
What if I need to merge and then also remove or reorder some pages?
Merge first, then use AllMediaTools’ page reordering and page deletion tools on the combined result — both work directly on an existing PDF without needing to start the merge over.
Can I split a large PDF back into separate files later if I need to?
Yes — our guide to splitting a PDF into multiple files covers exactly that, whether you need a specific page range pulled out or the whole document broken into one file per page.
Can I merge PDFs that have different page sizes (like a letter-size page mixed with a scanned receipt)?
Yes — each page keeps its own original dimensions in the merged file rather than being forced to match the others. The result can look a little inconsistent when flipping between differently-sized pages in a viewer, but nothing is cropped or distorted to force a uniform size.