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VellumPDF

Find duplicate pages

Double feeds from the scanner show up at a glance.

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How to remove duplicate pages from a PDF, step by step

Detection compares how pages look against one another, not just their text, and proposes a first sort for you to confirm.

  1. Drop in the PDF

    Analysis starts automatically, with a cancellable progress bar.

  2. Look over the proposed groups

    Pages judged identical are grouped together; the first occurrence of each group stays kept by default, the rest are ticked for removal.

  3. Adjust the tolerance if needed

    A higher number brings more visually different pages closer together.

  4. Check each group

    Original on the left, proposed duplicates on the right: correct the checkboxes by hand if a match is wrong.

  5. Click “Remove”

    At least one page must remain in the document.

On a scan that was never run through OCR, no text is available to confirm a duplicate: visual resemblance alone then decides, and two identical forms filled in differently can be mixed up. Check the thumbnails before confirming.

Frequently asked questions

How does VellumPDF compare two pages?

It computes a perceptual fingerprint: the page is shrunk to a thumbnail, converted into frequencies, and only the lowest of them — the overall structure of the page, not its detail — produce a 64-bit signature. Two pages are grouped when their signatures differ by only a few bits. This shrugs off scanner noise, a slight offset or a different contrast setting, where a byte-for-byte comparison would fail.

Could two forms filled in differently be mistaken for duplicates?

That is the limitation to know about. Two copies of the same form look almost pixel for pixel alike; only a few handwritten or typed values set them apart. When the PDF has a text layer, VellumPDF compares that too and refuses to group two pages whose text differs. On a scan that was never run through OCR, that safeguard does not exist: review the thumbnails before confirming the removal.

Which page is kept in a group of duplicates?

The first occurrence, in document order. The later ones are shown ticked and ready to be removed, and any tick box can be cleared with a click if you would rather keep two copies. The tolerance slider also lets you tighten or loosen what counts as “identical pages”.

Is the analysis free and private?

Yes. Computing the fingerprints, grouping the pages and building the final PDF all happen in your browser, with no page sent to a server and no account to create.