PDFページ並べ替え
Reorder PDF Pages rearranges a document in your browser by writing the order you want: 3, 1, 2 produces a file in that order. It also fixes the two orderings a sheet-fed scanner produces — a reversed stack, and the interleaved front-then-back-in-reverse result of scanning a double-sided document in two passes.
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How does Reorder PDF Pages work?
Most reordering needs come from a scanner rather than from an editorial decision, and two scanner behaviours account for nearly all of them.
The reversed stack
A feeder that takes the stack face-up and outputs face-down gives you the document backwards. The fix is a straight reversal, which is one button rather than typing out forty page numbers.
The double-sided two-pass scan
A single-sided feeder cannot scan both sides, so the usual procedure is: scan the whole stack, turn it over, scan it again. That produces all the odd pages in order followed by all the even pages in reverse — pages 1, 3, 5, 7 then 8, 6, 4, 2. A document like this reads correctly for its first half and then runs backwards, which is a very recognisable kind of broken.
Interleaving is the fix and it is fiddly by hand: you need the first page, then the last, then the second, then the second-to-last. The button does it, including the odd-page-count case where the final sheet has no back.
Typing an order
For everything else, write the page numbers in the order you want them: 3, 1, 2, or 1, 5-8, 2-4. Ranges work. Duplicates are allowed — repeating a page is occasionally deliberate, for a cover sheet or a form that needs two copies of one page. Omitting a page removes it, which makes this the general case of the delete tool.
Pages are copied, not shuffled in place
The reordered document is built by copying each page, in the order you gave, into a new document with its full dependency graph. That is what keeps the output a clean file rather than the original with a rewritten page tree — and it is why omitting a page genuinely removes its content rather than leaving it unreferenced in the file.
Input
scan.pdf (8 pages) scanned as 1,3,5,7 then 8,6,4,2
Output
reordered.pdf interleave → 1,2,3,4,5,6,7,8 each page copied with its resources
What options and edge cases does Reorder PDF Pages support?
| Parameter | Type | Default | Behaviour & edge cases |
|---|---|---|---|
| 3, 1, 2 | explicit order | — | Pages appear in the order written. One-based, as printed on the page selector. |
| 1, 5-8, 2-4 | ranges | — | Ranges expand in ascending order. Mix them freely with single pages. |
| Reverse | preset | — | The whole document backwards. For a feeder that outputs face-down. |
| Interleave | preset | — | For a double-sided document scanned in two passes: fronts in order, then backs in reverse. Handles an odd page count, where the last sheet has no back. |
| Duplicates | allowed | — | Repeating a page number repeats the page. Occasionally exactly what you want. |
| Omissions | removed | — | A page you do not list is not in the output, and its content is not in the file either — the survivors are copied into a new document. |
| Content | preserved | — | Each page is copied with its fonts, images and vector content. Nothing is re-rendered, so quality and searchability are unchanged. |
Frequently asked questions
My scan reads correctly and then runs backwards. What happened?
You scanned a double-sided document on a single-sided feeder: all the fronts in one pass, then the stack turned over for all the backs — which come out in reverse. So you have 1, 3, 5, 7 followed by 8, 6, 4, 2. The interleave button fixes exactly this, including the case where the page count is odd and the last sheet has no reverse side.
Can I repeat a page?
Yes. Writing 1, 1, 2 gives you two copies of page one. This is occasionally deliberate — a cover sheet that needs duplicating, a form where the same page is submitted twice — and there is no reason to forbid it.
What happens to a page I do not list?
It is not in the output, and its content is not in the file. The reorder is done by copying the pages you listed into a new document, so anything you left out was simply never copied — which makes this a superset of the delete tool rather than a different operation.
Does reordering change quality or file size?
Quality, no — each page is copied with its content stream and resources intact, not re-rendered. Size can change slightly: the new document is written fresh, so unreferenced objects and old incremental-save revisions from the original are not carried across. A file that has been edited many times can come out noticeably smaller.
Will the page numbers printed on the pages update?
No. A page number printed on a page is part of that page's content, not metadata, so moving the page moves the number with it. Renumbering is a layout operation that requires knowing where on each page the number sits and what typeface it is in — which is a word processor's job, not a PDF tool's.
Is my document uploaded?
No. Pages are reordered in this tab and the result is saved locally. connect-src 'self' in the page's Content-Security-Policy means the browser would block an upload attempt regardless.