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Put two or more documents back into one stream, taking one page from each in turn. This is the repair for a scanner that saved odd and even pages as separate files, and it works for three or more sources as well as two — a 30-page batch scanned in three splayed stacks interleaves back into reading order. You choose where to start and which file goes first, so the cycle can be offset if a run started on an even page. Nothing is uploaded, no watermark, and no sign-up.
To alternate and mix PDFs free, add two or more files and they are interleaved one page at a time. Fixes odd-pages and even-pages files from a duplex scanner. Runs in your browser with no upload and no watermark.
Scanner set to single-sided output on a duplex-feeder machine gives you front-pages.pdf and back-pages.pdf, both in page order but with half the document missing. Interleave them and the document returns. Check the first few output pages afterwards: a one-page offset means the first sheet was misfed, and the offset control fixes it.
Three stacks, three files, all in page order. Add all three and the cycle takes page 1 of each, then page 2 of each, and the batch reads correctly. This is why the tool is not limited to two files — three-splayed-run scanning is common on shared office machines.
If the pages are good and only the order is wrong, re-scanning wastes an hour and produces slightly worse pages. Interleaving rebuilds the document from pages you already have, losslessly, in a few seconds.
If the two files are separate halves of a document — a cover and a body, or two chapters — the pages belong in blocks, not alternating. Use Merge PDF for that. Interleaving is specifically for pages that should alternate one for one.
A scanner configured for single-sided output on a duplex machine produces two files — all the odd pages and all the even pages. Interleaving them one at a time restores the original reading order. It is also how you combine a batch that was scanned in several splayed runs.
It still works. The cycle continues with whichever files still have pages and stops contributing the ones that have run out, so a 20-page and a 7-page file interleave into 20 pages with the short file used up partway through. For a clean result, match the lengths first.
The order of files in the list is the cycle order, and you can start the cycle at any file. If the document should begin with page 2 of file one, put file two first.
Yes. Three or more files cycle in list order, one page from each in turn. This is the fix for a batch that was scanned in three or four splayed stacks and has to be reassembled.
Yes. Pages are copied across unchanged, so a text layer stays selectable and each page keeps its own size. If the odd and even files came from the same scan they are identical in size anyway.
Yes — an offset control lets the cycle start one page late, which is the case where the first page of the document was consumed by a misfeed. Setting the offset shifts everything back into place.
Yes. The full interleaved page order is displayed, mapping each output page to its source file and page number, before the file is built.
Yes. Free, no sign-up, no watermark, and the whole operation happens locally so it works offline.
More essential pdf tools — all free, no upload.