Private PDF tool

PDF Merge

Combine several PDFs into one document. Arrange the files in the order you want before merging.

No uploadNo sign-upLocal processing

No Upload: PDFs are merged on your device, 0 bytes sent
Free: $0, no account, no sign-up
Privacy: your files are never stored or sent; pdf-lib is self-hosted
Modes: merge 2+ files, custom order

Last updated: October 2026

Choose PDFs or drop them hereAdd two or more files · use arrows to change order

Merge faster: get paper into PDF

Disclosure: As an Amazon Associate I earn from qualifying purchases. The links below are affiliate links to Amazon search results, not products KokoroFlow has tested. Prices and availability change, so check the current price and compatibility on Amazon.

If your PDFs start as paper, scanning is usually the slow step. These help if you digitize documents regularly.

Portable document scannerSheet-fed and scans straight to PDF — worth it if you scan every week.See options on Amazon →Phone document scanner standHolds your phone steady over the page for sharper, faster phone scans.See options on Amazon →Expanding file folderKeeps paper originals organized after scanning, in the same order as your merged PDF.See options on Amazon →

What problem does PDF Merge solve?

It combines several PDF documents into one file in the order you choose. This is useful for joining scanned pages, reports, receipts, application documents, or chapters without uploading them to a remote service.

How to merge PDFs

Choose two or more PDF files.
Use the controls to place them in the required order.
Enter a clear output filename.
Select Merge PDFs.
Download and verify the complete document.

Privacy, formats, and limits

Upload: PDFs are processed locally in your browser.
Input/output: PDF only.
Size: No server limit; total pages, embedded images, and available device memory determine practical capacity.
Password-protected or damaged PDFs may fail.
Digital signatures, forms, attachments, links, or other interactive features may not survive unchanged.

Example

Combine cover-letter.pdf, resume.pdf, and portfolio.pdf in that order to create one application PDF. Open the result and check every page before sending it.

Frequently asked questions

Are my PDFs uploaded?

No. Processing is designed to happen on your device. Closing or refreshing the page clears the current selection.

Can it unlock a protected PDF?

No. The tool does not remove passwords or access restrictions.

Will a digital signature remain valid?

Creating a new combined PDF can invalidate signatures. Keep the originals and verify signed or regulated documents separately.

What's the fastest way to turn paper documents into PDFs before merging?

For a few pages, a phone scanning app is enough. If you digitize receipts, contracts or reports every week, a sheet-fed document scanner with an automatic document feeder can scan a whole stack straight to PDF, which you can then combine here in the order you need.