Merge and Split PDF Files Without Uploading Them

Merge and split PDFs without uploading them

Most free PDF websites work by uploading your file to their server, doing the work there and sending the result back. That is fine for a menu, but not for a signed contract, a payslip or a client's tax form. This tool does the same jobs inside your browser. The files are opened by your own computer, the new PDF is put together there, and the download comes straight from your browser. Nothing is sent anywhere.

It also does not re-draw your pages. Each page is copied into the new file exactly as it was, so text stays selectable, links keep working and the quality does not drop.

When it comes in handy

• Expense claims. Put a claim form and a pile of receipt scans into one PDF, in the order your finance team wants them.
• Contracts. Add the signed signature page back into the full contract, or swap an old page for the corrected one.
• Job applications. Join a cover letter, a CV and certificates into the single file an application form asks for.
• Scans that came out wrong. Turn the pages that were fed in sideways, and drop the blank backs of single-sided sheets.
• Sharing only what is needed. Pull the two relevant pages out of a 40-page report instead of sending the whole thing.

How to merge PDFs

1. Add your files. Drop them on the box above or press Choose PDF files. You can add more at any time.
2. Put them in order. Use the arrows next to each file, or drag the page thumbnails to move single pages.
3. Tidy up. Rotate a page that was scanned sideways, or press the cross on a page to leave it out. Press it again to bring the page back.
4. Download. Give the file a name and press Download merged PDF.

How to split a PDF

Switch to Split and choose how:

• Every page saves each page as its own PDF, all together in one ZIP file.
• Page ranges makes one PDF per range. For example 1-3, 4-6, 7- gives three files: pages 1 to 3, pages 4 to 6, and page 7 to the end.
• Pick pages lets you click the pages you want and saves them together as one new PDF. This is the quickest way to pull a single page out of a long document.

Good to know

• Password-protected PDFs cannot be opened here. Open the file in your PDF reader, remove the password (you need to know it), save a copy and add that copy instead.
• Big files are fine, but everything happens in your computer's memory. A few hundred pages is no problem on a normal laptop; very large scans may be slow on an older phone.
• Forms and signatures. Filled-in form fields are kept on the copied pages. A digital signature is not valid after merging, because any change to a signed PDF breaks the signature. That is how signatures are meant to work.
• Bookmarks from the original files are not carried over.

How this tool was tested

Before publishing, I ran 58 automated checks on the finished page in a Chromium-based browser (the engine behind Chrome and Edge). Last full run: 14 November 2026.

• Page ranges: 15 checks of how ranges like 1-3, 7-, last or 8-end are read, including mistakes such as backwards ranges and pages that do not exist, plus 300 random ranges compared with a simple count.
• The new PDF: pages come out in the chosen order, rotations add up correctly (a page already turned 90 degrees and turned 270 more ends up straight), text on a copied page is still selectable, and a 200-page file is rebuilt in reverse order in well under 8 seconds.
• Using the tool: the sample files, moving files and pages with the buttons and by dragging, leaving pages out, rotating, cleaning up the file name, and all three ways of splitting. Every download was opened again and its pages counted and checked.
• Problems: a text file, a damaged PDF and a password-protected PDF each get a clear message instead of an error.

What the tests did not cover: the test PDFs were made by the same PDF library the tool uses, not collected from the wild, and the real file-save dialog was replaced by a recorder. I did not run the tests in Firefox or Safari. If a PDF does not work, please tell me on the contact page.

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