Sejda PDF

Merge PDF

Combine several PDFs and images into one tidy document.

Drag & drop your PDF files here

Up to 20 files, 50 MB each

Merging happens entirely in your browser - your files never leave this device.

About Merge PDF

Drop in as many files as you like, drag them into the right order and export a single PDF. Bookmarks and page sizes from the originals are preserved, so a merged report still reads like one continuous document.

  • Unlimited number of source files
  • Mixed page sizes handled automatically
  • Original bookmarks kept

How to merge pdf

  1. 1

    Add your files

    Select two or more PDFs - images work too and are placed on their own page.

  2. 2

    Set the order

    Drag the thumbnails until the sequence matches the document you have in mind.

  3. 3

    Merge and download

    One file comes back, with the page numbering running straight through.

A practical guide to merge pdf

Assembling a report from many contributors

Merging shines when a document arrives in pieces: a cover letter from one person, a spreadsheet exported to PDF by another, and a signed appendix scanned separately. Add them all, drag the thumbnails until the running order reads the way a reviewer expects, and export once. Because pages are copied across rather than re-encoded, charts and photos stay exactly as sharp as in the originals. A good habit is to name each source file clearly before uploading, so the thumbnails are easy to tell apart while you set the sequence and you are not guessing which block is which.

Mixing images and PDFs cleanly

You can drop JPG and PNG files straight into the merge alongside PDFs, and each image lands on its own page in the spot where you place it. This is handy for slotting a photographed receipt or a signature snapshot between formal pages. For the tidiest result, make sure your images are roughly the orientation you want before uploading, since a landscape photo will create a landscape page. If you need several small images grouped on a single sheet instead of one per page, convert them with the JPG to PDF tool first and then merge that compact result.

Keeping the merged file lean

Combining documents adds their sizes together, so a stack of scan-heavy PDFs can produce a large final file. If the result feels too heavy to email, run it through the compress tool afterward, which resamples images while leaving text crisp. It also helps to remove obvious junk before merging: strip out blank separator sheets with the delete-pages tool so they do not carry into the combined document. Merging first and cleaning up second usually gives a smaller, neater file than trying to optimize each piece in isolation.

Frequently asked questions

Can I reorder files after I have already added them?
Yes. Every file and every page shows as a thumbnail, and you can drag them into any sequence right up until you export. Nothing is committed until you download the finished PDF.
What happens to files of different page sizes, like A4 and Letter?
Each source page keeps its own dimensions in the merged file, so an A4 report and a Letter attachment sit side by side without being stretched or cropped. If you need one uniform size afterward, run the crop or add-margins tool.
Do internal links and hyperlinks still work after merging?
Clickable web links stay live because they travel with the page. Cross-references that pointed to a spot inside the same original document keep working; a link aimed at a separate file will not follow into the merged result, since that target is a different document.
Are my files kept private during merging?
Your uploads are processed only for the session and then deleted automatically, and no account or signup is required. The originals on your device are never altered, so you always keep a clean copy.

Related tools

All tools

Organize PDF

Reorder, rotate and remove pages on a visual board.

Alternate & mix PDF

Interleave pages from two documents into one file.

Delete PDF pages

Remove blank sheets, adverts or drafts from a document.

Split PDF

Cut a document into separate files by page range.