Merge PDF Files
Combine several PDF files into one in the order you choose, optionally picking page ranges from each — merged on your device, never uploaded.
In short
Merging PDFs copies the selected pages of each file into a new document in the chosen order without re-rendering, so quality is unchanged and the output size is roughly the sum of the inputs; page ranges like 1-3,7 pick specific pages, and password-protected files must be unlocked first.
Who this is for: Anyone assembling documents — visa and job applications, invoices, reports — into one PDF.
How merging works
Each PDF is opened in your browser with the pdf-lib library, the pages you select are copied into a new document in the order you set, and the result is saved as a single file. Page content, fonts, images, links and form fields are copied as they are — nothing is re-rendered, so quality is unchanged and the merged size is roughly the sum of the inputs.
- Page ranges let you merge only the pages you need: 1-3,7 takes pages 1, 2, 3 and 7 of that file.
- Password-protected PDFs cannot be read; remove the password first. Scanned PDFs merge fine.
- Typical uses: combining a visa application with passport and bank-statement scans, assembling an invoice pack, or joining chapters of a report.
Assumptions
- pdf-lib copies the selected pages into a new document in list order.
- Page ranges parsed as comma-separated numbers and ranges; blank = all.
- Encrypted PDFs fail with a message; outlines are not copied.
Worked example
Application form (4 pages) + passport scan (1) + bank statements (pages 1–3 of a 12-page PDF) + employment letter (1) → one 9-page PDF named visa-pack.pdf, in that order, in a few seconds.
Frequently asked questions
Is there a file size or page limit?
No fixed limit; browsers handle files of 100 MB+ on a desktop. Very large scans on a phone may run out of memory.
Does merging reduce quality?
No — pages are copied, not re-rendered. To shrink the result, use the compress-PDF tool afterwards.
Can I merge JPG images with a PDF?
Convert the images to PDF first with the JPG-to-PDF tool, then merge.
Will bookmarks and form fields survive?
Form fields and links on copied pages are kept; document-level bookmarks (outlines) are not carried across.
How do I combine PDF files into one for free?
Select the files, set the order with the arrows, optionally type page ranges, and click Merge — the combined PDF is created in your browser.
Can I merge only certain pages?
Yes — enter a range such as 1-3,7 next to each file.
Related calculators
Found an error? Report it — tell us the inputs, the result you got, what you expected and the rule or source. Confirmed corrections are published within a week.
Ready to build your next digital solution?
Send the brief and you get a scoped response with approach, milestones and a fixed price range. Not a sales call.
A 30-minute call with the engineer who would run your project
Within 2 business daysA written scope: approach, module breakdown, milestones, fixed price range
Within 5 business daysYou decide. No retainer, no obligation, and the scope document is yours to keep either way
Your timelineSend your brief
Three fields to start. Add project details if you have them.