Does reordering pages change the file size?

Usually not. Reordering just changes the sequence of pages in the document's internal structure — the page content is the same, so the file size stays similar. Slight increases or decreases can occur depending on how the tool rewrites the PDF structure.

Can I reorder pages and rotate them at the same time?

Most tools treat these as separate operations. Reorder first, then rotate any pages that need rotating (or vice versa). Some advanced tools combine the two into a single interface.

Is there a limit to how many pages I can reorder?

In a browser-based tool, the practical limit is whatever your browser can render comfortably as thumbnails — typically a few hundred pages before the UI gets slow. For extremely long documents, command-line tools are faster.

Can I undo a reorder?

Within the tool, yes — most reorderers have undo and can reset to the original order. Once you've downloaded the reordered file, undo requires keeping the original file and re-running the operation differently. Always keep the source PDF until you've verified the output.

Why does my reordered PDF look different after saving?

Most commonly because the tool re-rendered pages during the save. If visible quality dropped, try a tool that preserves the original page content exactly (pdf-lib-based tools do this by default) rather than one that rasterizes and re-saves.

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