About Merge PDF
Merging joins several PDFs into one file, which is handy for sending a job application, a set of invoices or signed forms as a single attachment. Pages keep their original quality because they are copied across, not re-drawn.
How to use Merge PDF
- Add your PDFs in the order you want them to appear. The first file you add becomes the first pages of the merged document.
- Check the list. If a file is in the wrong place, remove it with the × button and add it again at the end.
- Press Merge PDF and wait a moment — large files can take a few seconds.
- Download merged.pdf and open it to check the page order before you send it.
Tips for better results
- Rename files with numbers first (01-cover.pdf, 02-cv.pdf) so you add them in the right order.
- If one page is sideways, fix it with Rotate PDF before merging.
- Merged files can get large. Run Compress PDF afterwards if an email limit is a problem (many providers cap attachments at about 20–25MB).
Limitations
Password-protected files must be unlocked first. Bookmarks and form fields from the original files may not carry over.
Frequently asked questions
Is there a limit on how many PDFs I can merge?
There is no fixed limit. The practical limit is your device's memory, so very large batches are best merged in a few rounds.
Will merging reduce the quality?
No. Pages are copied exactly as they are, so text stays sharp and selectable.
Are my files uploaded?
Your file is processed by your own browser. It is not uploaded to our servers, and closing the tab clears it from memory.
Guide last reviewed 28 October 2026 by the ModernExpert.AI team.