Weave two PDFs together page by page — the fix for a scanner without a duplexer, which gives you all the fronts in one file and all the backs in another. Free in your browser — no sign-up, no watermarks.
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A sheet-fed scanner that cannot do both sides at once leaves you with two files: pages 1, 3, 5 in one and 2, 4, 6 in the other. Merging them end to end gives a document with every front followed by every back, which is not the document. Interleaving alternates them so the pages come back in the order they were printed. And because a scanned stack comes out of the tray upside down, the second file is usually in reverse — which is a checkbox here rather than a re-scan.
PDF is the universal document format: it locks layout, fonts and images so a file looks identical on every device and printer. Scans, invoices, forms, e-books and reports all travel as PDF. Because a PDF is a container rather than an image, turning its pages into JPG or PNG pictures — or bundling pictures into a PDF — are among the most common file tasks there are.
A sheet-fed scanner that cannot capture both sides at once leaves you with a specific and very annoying problem. You feed the stack through, get a file with pages 1, 3, 5, 7. You turn the stack over, feed it again, get a second file with the other sides. Merging them gives you a document with every front followed by every back — which is not the document, and is unreadable as one.
Interleaving takes one page from each in turn, so the document comes back in the order it was printed.
This catches people out every time. When a stack comes out of the scanner tray it is upside down, so feeding it back through captures the last sheet first: the backs arrive as pages 8, 6, 4, 2. Interleaving that as-is pairs the front of page one with the back of page eight and produces nonsense that looks almost right.
That is what the reverse option is for, and it is the normal case rather than the exception — if the result reads oddly, this is the first thing to change.
Pages are alternated for as long as both files have them, and anything left over is added at the end rather than dropped. The result says the counts did not match, which is nearly always a blank final side or a sheet that failed to feed. Check the end of the document.
Scanned backs are frequently blank, and a document that is half blank pages is worth thinning — remove them with Remove PDF Pages. If the whole scan came out sideways or upside down, fix that first with Rotate PDF.
Yes — completely free, with no sign-up, no watermarks and no daily quota. Processing happens in this browser, so the practical limit is the memory available on your device.
Yes. Add as many files as you like — each one is processed in sequence with its own progress status, and you can download the results individually or all together as a ZIP archive.
No. Pages are copied at the object level — text, fonts, images and vector content are carried over as-is, without re-rendering. The output keeps the same sharpness and searchable text as the original.
The pages are alternated for as long as both files have pages, then whatever is left over is added at the end, and the result says the counts did not match. That is usually a sign the last sheet was blank on one side — check the end of the document.
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