🔀 Merge Odd and Even Pages

For scanners that only do one side

Most home and office scanners with a document feeder only scan one side at a time. The usual trick is to scan every front, turn the stack over and scan every back. That leaves you with the pages in the wrong order: all the odd pages, then all the even pages, and the even ones usually backwards.

This tool pairs each back with its front and gives you a single PDF that reads 1, 2, 3, 4. It works whether the backs are in a second file or at the end of the same file.

Blank backs and missing pages

If the last sheet has a blank back that your scanner skipped, that is fine: the document simply ends on that sheet's front. If the counts are further apart than that, a page is missing from one of the scans, and the tool says so instead of pairing the wrong pages together.

Kept every blank back and want them gone? Run the result through Remove Blank Pages. Pages scanned upside down can be fixed in Rotate PDF Pages.

Private by design

Double-sided scans are often contracts, medical forms or tax papers. Everything here runs in your browser, so the pages are never sent to a server, and there is no sign-up or limit on file size beyond what your device can hold.