How to merge PDF files
- Add your PDFs. Drag files into the box above, or tap Select PDF files. You can add more at any time.
- Put them in order. Drag the cards, or use the ↑ and ↓ arrows. Tip: name files
01-…,02-…and use Sort A–Z. - Merge and download. Press Merge PDF, then download your combined file.
Private by design: your files stay on your device
Most online PDF tools upload your documents to their servers. PDFWisely's Merge PDF tool works differently: the merging happens entirely inside your web browser, using the open-source pdf-lib library. Your files are never sent to us, so there's nothing for us to store, view or delete.
You can check this yourself: load the page, turn off your internet connection, and the merge still works.
Tips for a clean merged PDF
- Merging isn't the same as compressing. The merged file is roughly the size of all your files added together. If it's too large to email or upload, run it through Compress PDF afterwards.
- Fillable forms can clash. If two forms use the same field names, typing in one field may fill both. Flatten forms before merging.
- Password-protected PDFs must be unlocked first with the password you were given. Use Unlock PDF, then merge.
- Have photos or Word files too? Convert them with JPG to PDF or Word to PDF first, then merge everything together.
- Need only some pages? Use Split PDF to extract the pages you want before merging.
Frequently asked questions
Is Merge PDF free?
Yes. There's no sign-up, no watermark and no limit on the number of files.
Are my files uploaded to a server?
No. The files are read and merged by your own browser, and the result is created on your device.
Is there a file size limit?
There's no fixed limit. Because merging runs on your device, very large files (hundreds of MB) depend on your device's memory. On older phones, merge large files in smaller batches.
Will merging reduce the quality of my PDF?
No. Pages are copied exactly as they are, so text, images and layout stay unchanged.
Can I merge PDFs on iPhone or Android?
Yes. The tool works in Safari, Chrome and other modern mobile browsers. Select files from your Files app, iCloud Drive or Google Drive.
Why won't one of my files merge?
The usual reasons are a password-protected PDF, a damaged file, or a file that isn't really a PDF (for example, an image renamed to .pdf). The tool will tell you which file caused the problem.
Are bookmarks and links kept?
Page content, including visible text and images, is kept. Bookmarks (the outline panel) from the original files and some interactive links may not carry over to the merged file.