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This repeats the pages you choose inside the document. Copies are references to the same underlying content, so duplicating a page ten times costs far less than ten times the file size.

The common cases are printing: several copies of a single-page form on one print run, a registration sheet that needs one per attendee, or padding a document out to a multiple of four so it can be folded into a booklet.

كيف تعمل

1. Drop the PDF onto this page.
2. Name the pages to repeat and how many extra copies of each you want.
3. Choose collated, where copies sit next to the original, or appended, where the whole selection repeats as a block at the end.
4. Press Duplicate.
5. The download starts immediately.

The two placements are the same distinction a printer dialog makes between collated and uncollated output, and picking the wrong one is annoying rather than harmful. Collated gives 1, 1, 1, 2, 3 - three copies of page one, in place. Appended gives 1, 2, 3, 1, 1 - the original document followed by the extra copies. For printing separate handouts, appended is usually right; for a form that repeats within a document, collated is.

Duplication is cheap because PDF pages can share the objects they draw. Ten copies of a page with a large embedded photograph add ten page entries, not ten photographs, so the file grows by a few kilobytes rather than several megabytes.

This is also the tool for padding a booklet. Saddle-stitched booklets need a page count that is a multiple of four; if yours is not, Insert blank pages is usually the better fit, but duplicating a cover or a notes page works too when you want something on the extra sheets.

Bookmarks point at the first occurrence of a duplicated page, since a bookmark can only lead to one place.