Merge PDF
Combine multiple PDFs into a single file. Drag to reorder. Everything happens locally in your browser - nothing is uploaded.
Drop PDF files here
or click to browse - add as many as you like
About this tool
Combine PDF Files
The accountant needs all twelve invoices in one file. The lawyer wants the contract, addendum, and signature pages merged. The student has scanned each chapter separately and needs a single thesis PDF. Every day, millions of people need to combine PDFs — and most end up uploading sensitive documents to a random website to do it.
KuroPDF merges your PDFs entirely in the browser. Drop them in, drag to reorder, click merge. The output is a proper, bookmarkable PDF with the correct page count and intact metadata. No server ever sees your contracts, tax returns, or medical records.
There is no file-count limit and no size cap. Merge two files or two hundred. A 500MB scan collection merges just as smoothly as a pair of one-page letters. The only constraint is your device memory.
The merge preserves everything: bookmarks, internal links, form fields, and annotations all carry through to the combined document. It is a true structural merge, not a "print to PDF" hack.
How to use
- Add your PDFs
Drop multiple PDF files into the tool or click to browse. Add as many as you need — there is no limit.
- Arrange the order
Drag files up and down to set the page order of the final document. Use A-Z sort for alphabetical/numeric ordering.
- Name your output
Set a filename for the merged PDF. The default is "merged.pdf" but you can name it anything.
- Merge and download
Click "Merge PDFs." The combined document downloads in seconds, ready to share or archive.
Join PDF Files
Stitch multiple PDFs together into a single file in a couple of clicks.
No account, no watermark, and nothing leaves your computer.
Combine Invoices into One PDF
Bundle a month of invoices or receipts into one PDF for bookkeeping and expense claims.
Because it runs locally, your financial documents never touch a third-party server.
Frequently asked questions
Is there a limit on how many PDFs I can merge?
No limit. Merging runs locally on your device, so you can combine hundreds of files in a single session. The only real constraint is your device memory.
Can I reorder files before merging?
Yes — drag files up or down to set the exact page order. You can also sort alphabetically with one click if your files are named sequentially.
Are bookmarks and links preserved?
Yes. The merge engine preserves bookmarks, internal links, form fields, and annotations from every source file.
Does this work offline?
Yes. Once the page loads, all merging happens entirely offline using WebAssembly. No internet connection required.
Is it really free with no watermark?
Yes — completely free, no watermark, no sign-up, no daily limit. Use it as much as you need.
Is this safe for financial or legal documents?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Is it really free?
Yes - free, no watermark, no sign-up.
Is this safe for financial documents?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Can I set the order?
Yes - drag invoices into chronological order before merging.
How many PDFs can I merge at once?
There is no limit. Users regularly merge 50-100 files in a single session. The only constraint is your device memory.
Will my files be uploaded to a server?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Can I merge PDFs on my phone?
Yes. KuroPDF works in any modern mobile browser (Safari, Chrome, Firefox). Just open the site, add files, and merge — same workflow as desktop.
Are bookmarks and form fields preserved?
Yes. The merge preserves bookmarks, hyperlinks, form fields, and annotations from all source files.
Can I merge password-protected PDFs?
You need to unlock them first. Use the Protect PDF tool to remove the password (you must know it), then merge the unlocked files.
Is there a way to merge PDFs offline?
Yes. Install KuroPDF as a Progressive Web App (your browser will offer this option), and the merge tool works without any internet connection.
How is this different from Adobe Acrobat?
Adobe Acrobat Pro costs $20/month and requires installation. KuroPDF is free, runs in your browser, requires no account, and processes files locally instead of uploading them to Adobe servers.
Can I reorder pages?
Yes - drag files into the order you want before merging.
Is it private?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Does this work on iPhone?
Yes - KuroPDF works in any modern browser on iPhone. No app download required.
Does this work on Android?
Yes - KuroPDF works in any modern browser on Android. No app download required.
Does this work on Mac?
Yes - KuroPDF works in any modern browser on Mac. No app download required.
Does this work on Chromebook?
Yes - KuroPDF works in any modern browser on Chromebook. No app download required.
Does this work on iPad?
Yes - KuroPDF works in any modern browser on iPad. No app download required.
Does this work on Windows?
Yes - KuroPDF works in any modern browser on Windows. No app download required.