How to merge PDF files online
Merging PDFs means combining several separate documents into a single, continuous file in the exact order you choose. It is one of the most common everyday document tasks: you might have a scanned contract, a cover letter and an appendix that all need to travel together as one attachment, or a set of monthly invoices that belong in a single archive. Instead of sending three or four files and hoping the recipient opens them in the right sequence, you hand over one clean PDF.
Our online merger runs entirely from your browser. You add the files you want, arrange them, and download the combined result — there is nothing to install and no account to create.
A merged file is also easier to work with downstream: page numbering can be made continuous, the print dialog sees one job instead of four, and full-text search covers everything at once. Keep an eye on size, though — four 8 MB scans become one 32 MB file. If the result is too heavy to send, pass it through Compress PDF afterwards: compression re-encodes the scanned images inside the file and typically halves the weight without touching the text.
Step by step
- Open the Merge PDF tool and drag your documents into the upload area, or click to browse for them.
- Add as many files as you need; the free plan accepts files up to 20 MB each.
- Reorder the documents by dragging them until the sequence is correct.
- Press Process and wait a moment while the files are joined.
- Download your single merged PDF — the original files are never changed.
Limits and formats at a glance
| Input | PDF files, any version — scanned or digital |
|---|---|
| Files per merge | Up to 5 at a time on the free plan |
| Max size | 20 MB per file free · up to 1 GB with PRO |
| Output | One continuous PDF; pages are copied 1:1, never re-compressed |
| Typical speed | A 100-page merge completes in a few seconds |
| Cost | Free · no account, no watermark |
Why use this tool
A single PDF is far easier to share, print and store than a folder full of loose pages. Email systems impose attachment limits and often strip or reorder multiple files; one merged document sidesteps both problems and guarantees the reader sees everything in the intended order.
Merging also preserves formatting. Because PDF is a fixed-layout format, fonts, images and page breaks look identical on every device, so a contract you combine today will read the same way on a phone, a laptop or a printer years from now.
Doing it in the browser keeps your documents private and saves time: there is no software to download, no watermark stamped on the result, and nothing parked in a third-party account. Typical real-world uses include assembling a tender response from separate sections, combining scanned receipts for an expense report, joining the chapters of an e-book, or putting a signed contract back together with its annexes before sending it to a client.
Merging is not always the right tool for the job, so it helps to know its neighbours. If you need to re-order, rotate or delete pages inside a single document, Organize pages gives you page-level control that a merger does not. If a recipient only needs one chapter of a long report, Split PDF is the better choice — a 3-page extract shares far less than a 90-page compilation. And when two source files contain interactive forms with identically named fields, flatten or print them to PDF first, otherwise the fields can bind together and show the same value in both sections after the merge.
Is it safe? Your privacy
Your files are uploaded only to perform the merge and are deleted automatically from our servers within minutes of the operation finishing. We never open, index, sell or share their contents.
Troubleshooting: common problems and fixes
- The merged file is too big to email. — Attachment limits are usually 20–25 MB. Merge first, then run the result through Compress PDF: scanned pages are typically reduced by half or more with no visible quality loss.
- One of my files is rejected because it is password-protected. — Mergers cannot read encrypted PDFs. Remove the password first with Unlock PDF (you need to know it), then merge the unlocked copy.
- Page numbers are wrong after merging. — Merging copies pages exactly as they are, so each section keeps the numbers printed on its pages. Add fresh, continuous numbering to the combined file with Page numbers.
- Bookmarks and the clickable table of contents disappeared. — Internal navigation is document-level data and combining files can invalidate it. If navigation matters, add a simple contents page of your own, or keep the chapters separate and share them as a ZIP instead.
Frequently asked questions
Is there a limit to how many PDFs I can merge?
On the free plan you can combine several files at once, each up to 20 MB. For very large batches or bigger files, easyPDF PRO raises the limits considerably.
Will merging reduce the quality of my pages?
No. Merging copies each page exactly as it is, so text stays sharp and images keep their original resolution.
Can I choose the order of the pages?
Yes. Before processing, drag the files into the exact sequence you want; they are joined top to bottom in that order. You can also remove a file you added by mistake without starting over.
What happens if my PDFs have different page sizes?
Each page keeps its own dimensions and orientation in the merged file, so an A4 report and a landscape spreadsheet can sit in the same document without being stretched or cropped.
Are links and images kept after merging?
Yes. Page content, hyperlinks and images are carried over exactly as they were. Merging never re-compresses your pages, so nothing is degraded in the process.
Do I need to install anything or create an account?
No. Merging runs entirely in your browser, with no software, plugin or sign-up. Your files are processed only to perform the merge and then deleted automatically within minutes.
Can I merge files that are not PDFs, like Word documents or photos?
Convert them first: Word to PDF for .docx files and JPG to PDF for images. Once everything is a PDF, the merger can combine the set in any order you like.
Does the order I upload the files in matter?
No — upload order is just a starting point. You can drag the files into any sequence before processing; the final PDF follows the order shown in the list, top to bottom.