Merge PDF
Drop in several PDFs, set the order, and get one file. For contracts, receipts and assignments.
Order and rotation
Files are sorted by name (01, 02 …) when added. Use ↑ ↓ to move them and ↻ to rotate a landscape scan in 90° steps. Rotation applies to the whole file.
Does the file get bigger?
Pages are copied as they are, so the merged file is usually about the sum of the originals. Fonts repeated across files can add a little. To shrink an image-heavy document, export it with PDF → image at a lower quality and rebuild it with images → PDF.
Password-protected PDFs
They will not open. A viewing password should only be removed by someone entitled to read the document, so remove it in the original program first.
Forms and signatures
Fillable form fields and digital signatures may not survive page copying. If a document is signed, check the signature area after merging.
Tips for common situations
Arrange Tax Forms by Filing Order
Place W-2s and 1099 forms in chronological order before deduction receipts using the reorder buttons, and rotate any sideways-scanned pages. All merging runs locally in your browser, so sensitive financial documents are never uploaded to an external server.
Package Rental Application Neatly
Position your cover letter or application form first, then arrange pay stubs, bank statements, and reference letters in the order your landlord expects. Rotate any sideways-scanned pay stubs before merging so landlords receive a professionally oriented document.
Merge on iPhone Without Extra Apps
Open the tool in Safari and select PDFs directly from the Files app, then reorder them with touch controls. Processing runs entirely within the browser with no server upload, saving mobile data and letting you save the merged file straight to the Files app.
Tried with a sample file
Screens and numbers from actually running this tool with a sample file with no personal data (2026-10-06, Chromium-based browser on a Mac). Results vary with your input and device.
Two 3-page sample PDFs (1.86 MB and 1.86 MB) showed as '2 files · 6 pages', and the merged download was 3.73 MB — about the sum of the originals (3.73 MB). Merging joins pages as they are, so quality is unchanged and size does not shrink.
Frequently asked
Are my documents uploaded?
No. Reading and rebuilding the PDF happens inside your browser. It keeps working if you go offline after the page has loaded.
How many files can I merge?
There is no limit. Several very long documents can use a lot of memory on a phone, though.
Can I interleave individual pages?
This tool orders whole files. Extract the pages you need with Split PDF first, then merge.
Can I merge password-protected PDF documents?
No, encrypted or password-protected PDF files cannot be opened or merged.
Can I rotate an entire PDF before merging it?
Yes, you can rotate files in 90-degree increments, reorder them, or remove individual files from the list.
Will digital signatures and fillable form fields remain intact after merging?
Digital signatures and interactive form fields may not be preserved during the merge process.
Is it safe to merge confidential documents on Keepdesk?
Yes, all processing happens entirely within your browser without uploading your files to any server.