Is my data sent to a server?

No. This tool runs 100% in your browser. Nothing is uploaded, tracked, or stored remotely.

What extra features does this tool have?

Extras: (1) Drag-and-drop file upload; (2) Bulk processing; (3) Live preview; (4) Multiple format support; (5) Quality/size controls; (6) Preset configurations; (7) Export as ZIP; (8) Copy to clipboard; (9) History (localStorage); (10) PWA offline; (11) Privacy-first; (12) WCAG compliant.

Does this work offline?

Yes — install as a PWA and use it without network.

Are my documents uploaded?

No. The merge happens in this tab using your own browser, there is no network request in this tool, and it works offline. Your files are held in memory only for as long as the merge takes.

Why did this tool not work before?

It was published from an unfinished template. It had no file input and its processing function returned whatever you typed straight back, so it never merged anything. This version does the real work.

How do I write page ranges?

Like 1-3, 7, 10- for pages one to three, seven, and ten to the end. Use -1 for the last page. If a range is impossible, you get a sentence explaining why instead of an empty result.

Can I merge a password-protected PDF?

Not directly. It is detected and named, and the other files still merge. Remove the password in your PDF reader first, then add it again.

One of my files is broken. Does everything fail?

No. A file that cannot be opened is named and skipped, and the rest are merged. The receipt lists what was left out.

My pages are different sizes. Is that a problem?

It is normal, and the tool warns you before merging. If you want one size throughout, turn on making every page the same size and pick the source.

Does rotation replace what the file already had?

No, it is added to the existing rotation, so a page already turned sideways ends up where you expect.

Can I use the same file twice?

Yes. Add it again for a cover or a divider. You get a note in case it was an accident.

What is the size limit?

One hundred megabytes per file and three hundred for one merge, with a maximum of fifty files. These keep the tab responsive, and you are told the real numbers if you go over.

PDF Runs in your browser

Merge PDF

Merge multiple PDF files into one. Reorder pages, drag-drop, range selection.

100% Private Works Offline Instant Coming Soon

Upgrade coming soon

This preview template is being upgraded with extra features — 100% local, zero network requests.

Your PDFs

Drop them here, or choose them. Up to 50 files, 100.00 MB each, 300.00 MB in total.

This merge cannot run yet

There is nothing to merge yet. Add at least one PDF that opened successfully.

How to merge them

A bookmark for each file

Named in the receipt so you can check it.

Use each PDF's own title for its bookmark

A blank page between files

Pad each file to an even page count

For double-sided printing, so no section starts on the back of another.

Make every page the same size

Which size

Keep the file small

Uses object streams. Turn off only if a reader complains.

Remove all metadata from the result

Title

Author

Subject

Keywords

Separated by commas.

File name

Saved as merged-2026-09-15.pdf

Save these settings as

Write today's date into the file

Turn this off if you would rather not record when it was made.

How to use this

Add your PDFs. Drop them anywhere on the tool, or use the button. Each one is checked and its page count read.
Put them in order. Drag them, or use the up and down buttons, or sort by name, size, date or page count.
Choose pages if you need to. Per file you can take a range such as 1-3, 7, 10-, take only odd or even pages, rotate, or leave a file out.
Merge and take it. You get a real PDF, plus a receipt listing exactly which pages came from which file, in order.

Questions

Are my documents uploaded?: No. The merge happens in this tab using your own browser, there is no network request in this tool, and it works offline. Your files are held in memory only for as long as the merge takes.
Why did this tool not work before?: It was published from an unfinished template. It had no file input and its processing function returned whatever you typed straight back, so it never merged anything. This version does the real work.
How do I write page ranges?: Like 1-3, 7, 10- for pages one to three, seven, and ten to the end. Use -1 for the last page. If a range is impossible, you get a sentence explaining why instead of an empty result.
Can I merge a password-protected PDF?: Not directly. It is detected and named, and the other files still merge. Remove the password in your PDF reader first, then add it again.
One of my files is broken. Does everything fail?: No. A file that cannot be opened is named and skipped, and the rest are merged. The receipt lists what was left out.
My pages are different sizes. Is that a problem?: It is normal, and the tool warns you before merging. If you want one size throughout, turn on making every page the same size and pick the source.
Does rotation replace what the file already had?: No, it is added to the existing rotation, so a page already turned sideways ends up where you expect.
Can I use the same file twice?: Yes. Add it again for a cover or a divider. You get a note in case it was an accident.
What is the size limit?: One hundred megabytes per file and three hundred for one merge, with a maximum of fifty files. These keep the tab responsive, and you are told the real numbers if you go over.

What this tool assumes

Files are merged in the order shown in the list, top to bottom.
A file that cannot be opened is named and skipped; it never stops the others.
Page numbers you type are counted from 1, and −1 means the last page.
Rotation you choose is added to any rotation the page already had.
Nothing is uploaded, and no document is ever stored. Only your settings are remembered.

Related tools

Split PDF — The opposite job: pull one document apart.
Compress PDF — Shrink the merged file before sending it.
Images to PDF — Turn scans into a PDF first, then merge.
PDF to Images — Check the merged result page by page.

Your documents stay here

The merge runs in this tab using your own browser. There is no network request in this tool, it works offline, and your files are held in memory only for as long as the merge takes. Only your settings are remembered, in this browser.

Merge multiple PDF files into one. Reorder pages, drag-drop, range selection. Everything runs locally in your browser — your data never leaves your device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

All tools