To merge PDF files online, open Merge PDF, add your files, drag them into the order you want, and press MERGE. The merged document follows the order the files appear on screen — not the order you added them, and not the order you ticked them — which is the detail most guides leave out and the reason most merges come out wrong.
This covers:
- The four steps, start to finish
- How the page order is actually decided
- Merging only some of the files you've added
- Pulling files straight from Google Drive or Dropbox
- What to do when the result isn't what you expected
Merge PDF files in four steps
- Open Merge PDF. Nothing to install and no account needed to start.
- Add your files. Drag them onto the drop zone, or use Add More Files to pick from your device, Google Drive, or Dropbox. Each file shows an upload percentage, then a brief security check before it's ready.
- Put them in order. Drag the rows (or the icons) until the sequence matches the document you want. More on this below — it's the step that matters.
- Press MERGE and download the combined file.
There are no quality settings or output options to choose. Merging is lossless in the sense that matters here: pages are carried across as they are, not re-rendered, so text stays selectable and images keep whatever resolution they arrived with.
Got the files in front of you?
Try Merge PDFHow the page order is actually decided
This is where merges go wrong, so it's worth being precise.
The merged PDF follows the order the files appear on screen. When Merge PDF is the active tool you'll see a hint in the top right — Drag & drop files to re-order — and you can drag rows into place in either view.
Two views, same ordering:
- List view shows names and file sizes. Better when your filenames are meaningful (
01-cover.pdf,02-report.pdf). - Icons view shows a thumbnail of each file's first page. Better when the filenames are
scan_0043.pdfand you need to see what you're actually holding.
Switch between them with the view switcher above the file list. There's also an eye icon on each row that opens a preview, so you can check a file's contents without leaving the page.
The switcher has a third option, Pages, which breaks your files into individual page cards you can reorder, rotate, or remove before merging. That's a different job — combining parts of files rather than whole ones — and it has its own guide.
Ticking order doesn't matter
If you select files with the checkboxes, the sequence you tick them in has no effect on the result. Only the on-screen order counts — so reorder first, or reorder afterwards, and either way what you see is what you get.
Merge only some of the files you've added
The checkboxes control which files go into the merge, and they follow one simple rule:
| What you select | What gets merged |
|---|---|
| Nothing ticked | Every file in the list, in the order shown |
| Some files ticked | Only those files, still in the order shown |
The MERGE button shows the count in brackets — MERGE [ 3 ] — so you can confirm before you commit. If it shows no number, you're merging everything.
That makes it easy to assemble two documents from one pile of uploads: tick the first set, merge, then change the selection and merge again. The uploaded files stay put between runs.
Pull files straight from Google Drive or Dropbox
You don't have to download a file just to re-upload it. The drop zone has Google Drive and Dropbox buttons, and the Add More Files dropdown offers the same two sources once you have files in the list. Pick the files in the provider's own picker and they land in the list like any local upload.
This is the fastest route when the documents you're combining live in a shared team folder rather than on your machine.
Keep the merged file small enough to send
A merged PDF is roughly the sum of its parts, so combining five scanned documents produces one large scanned document. That's usually fine until you try to email it — most mail servers reject attachments somewhere around 20–25 MB.
If the result is too big, run it through Compress PDF afterwards. It offers three levels — Best Compression, Average, and Low — and scanned pages tend to shrink the most, because the images inside them are what's taking up the room. There's more on choosing a level in our guide to compressing PDFs.
Merge first, compress second
Compressing each file before merging gives you a worse result for more work. Combine everything, then compress once — the tool can only make sensible tradeoffs when it can see the whole document.
When the merge isn't what you expected
| What you're seeing | What happened | Fix |
|---|---|---|
| Pages in the wrong order | The on-screen order didn't match what you wanted | Drag the rows, then merge again — the files are still uploaded |
| A file is missing from the result | It wasn't ticked, and something else was | Untick everything to merge all of them, or tick the one you missed |
| Merged file is too large to email | It's the sum of the originals | Run it through Compress PDF |
| Can't add any more files | Without an account there's a cap on how many files the workspace holds at once | Merge in batches, or see pricing for higher limits |
| The text isn't searchable | The originals were scans — images of text, not text | Merging preserves what was there; it can't add text that never existed |
That last one catches people out regularly. A scan is a picture of a page. Merging, splitting, and compressing all leave it a picture — if you need to search or copy the text, the file needed optical character recognition before it ever reached the merge step.
Where merging fits with the other tools
Merging is usually one step in a longer job. The common pairings:
| You want to | Tool |
|---|---|
| Keep only some pages while combining | Pages view in Merge PDF — see how |
| Save pages as their own separate files | Split PDF |
| Shrink the combined result | Compress PDF |
| Turn photos or scans into PDFs first | JPG to PDF |
| Edit the merged document | Edit PDF |
| Ask questions about a long merged file | Chat with PDF |
A merged report you now need to read rather than assemble is a good candidate for the last one — chatting with a PDF beats scrolling through 200 combined pages looking for one number.
See all PDF tools.
Frequently Asked Questions
Does the merged PDF follow the order of my files?
Yes — it follows the order the files appear on screen, which you set by dragging the rows or icons. The order you added them in and the order you ticked their checkboxes both have no effect.
How many PDFs can I merge at once?
Enough for a large batch in a single pass. Without an account there's a cap on how many files the workspace holds at one time; if you regularly work above it, the pricing page covers the higher limits.
Can I merge only some of the files I've uploaded?
Yes. Tick the files you want and the MERGE button shows how many are included. If you tick nothing, every file in the list is merged.
Can I remove or rotate individual pages while merging?
Yes — switch the view to Pages and every page becomes a card you can reorder, rotate, or remove before you merge. How to merge specific pages walks through it.
Can I merge files stored in Google Drive or Dropbox?
Yes. Both are offered on the drop zone and in the Add More Files menu, so you can pick documents from either without downloading them first.
Do I need to install anything?
No. Merging runs in your browser, on Windows, macOS, Linux, and mobile alike. There's also a desktop app if you'd rather work offline.
Why is my merged PDF so large?
Because it contains everything the originals did. Scanned pages are the usual culprit — they're images, and images are heavy. Run the merged file through Compress PDF to bring it down.
