PDF Merger

Combine multiple PDF files into one.

Drop PDF files here or

How to use

  1. Drop or browse to select two or more PDF files.
  2. Reorder them with the ↑ ↓ buttons. Top of the list becomes the first page of the output.
  3. Remove any file with the ✕ button if you change your mind.
  4. Click Merge PDFs.
  5. Click Download to save the combined file.

What does it do?

The tool reads each PDF you add, copies every page into a new document in the order you specify, and saves the result as a single PDF. Page content — text, images, vector graphics, and page-level annotations — is preserved. Document-level features like bookmarks and named form fields are not copied; this is a known limit of the page-level copy the tool performs.

Example

Input — three files dropped into the list:

1. cover-letter.pdf   (1 page)
2. resume.pdf         (2 pages)
3. references.pdf     (1 page)

After clicking Merge PDFs:

merged.pdf  (4 pages)
  page 1: cover-letter page 1
  page 2: resume page 1
  page 3: resume page 2
  page 4: references page 1

Common errors and pitfalls

Most merge failures come from one of a handful of problems with the source files. The file list flags the specific issue next to each file name.

  • Encrypted PDF. Encrypted PDF — cannot be merged means the file has a password. Unlock it in your PDF viewer first, then re-add the unprotected copy.
  • Wrong file dropped. A .docx or .pages file is skipped with "No PDF files selected." Convert to PDF first — the tool only accepts real PDFs.
  • Bookmarks disappear. The merged file will not contain the outline/bookmarks from the originals. If bookmarks matter, add them in a dedicated editor after merging.
  • Mixed page sizes. Merging an A4 file with a Letter file produces a PDF with both sizes. Some viewers fit-to-page, others show the smaller page centered. Resize in your editor if you need uniform sizing.
  • Corrupted PDF. Could not read: ... means the tool could not parse the file. Try re-exporting the source, or open and re-save it in your PDF viewer.
  • Form fields collide. If two PDFs have form fields with the same internal name, the merged file may behave oddly — editing one field updates the other. Flatten forms before merging if you are combining filled forms.

Is my data private?

Yes. We don't save any of the PDFs you add to the merge, and we don't keep the combined file either. Nothing is stored, logged, or retained — everything is discarded the moment you close or refresh the tab. There's no record on our side of what you merged. Feel free to verify in your browser's developer tools.

Frequently asked questions

Will merging preserve bookmarks, form fields, and annotations?

Page content, text, images, and annotations that live on a page are preserved. Document-level features — the outline/bookmarks tree, interactive form fields with names, and attached files — are not copied to the merged file. This is a limitation of page-level copying in the browser. If you need bookmarks preserved, flatten forms and export bookmarks separately before merging.

Can I merge password-protected PDFs?

No. If any file is encrypted, you will see an "Encrypted PDF — cannot be merged" error next to it. Open the file in your PDF viewer, enter the password, then use File > Save As to export an unprotected copy. Load that copy here instead.

Does the order of files in the list match the merged output?

Yes. Files are concatenated in the order shown in the list, top to bottom. Use the up and down arrows next to each file to reorder before clicking Merge. The preview count shows the total number of pages so you can sanity-check before merging.

What is the maximum number of files or total size I can merge?

There is no hard cap on file count, but the combined output must fit in browser memory. On a modern laptop that is roughly 1–2 GB for the output PDF. Dozens of small PDFs merge in seconds. Very large scanned documents over 500 MB combined may slow the tab or fail in low-memory browsers.

Will merging change the visual layout or page sizes?

No. Each page is copied at its original size and orientation. If one PDF uses A4 and another uses Letter, the merged file contains pages of both sizes. If you need a uniform size, resize pages in your PDF editor first or use a tool like pdf-organize to rotate after merging.

Do you save the PDFs I merge here?

No. We don't save the PDFs you add, and we don't keep the merged file you download either. Everything is discarded as soon as you close or refresh the tab — no logs, no record on our side of what you combined. You're welcome to verify in your browser's developer tools.

Related tools

  • PDF Split — pull specific pages out of a merged file, or split by range.
  • PDF Organizer — after merging, rotate or reorder individual pages.
  • PDF Compress — shrink a merged document before emailing or uploading.
  • Images to PDF — convert JPG or PNG files to PDF first so they can be merged here.
  • PDF Page Numbers — add consistent numbering across the combined document.
  • All PDF tools