Deleting, extracting, rotating and reordering PDF pages are the simplest PDF jobs, so guides rarely say what they do to the file. The sizes matter more than you would think: people extract one page to get under an upload limit and find the file barely shrinks. We ran the same operations our page tools use on two test PDFs and measured the results. One of them, a PDF whose pages share a letterhead image, behaved in a way that surprised us.
How the page tools work
Delete, extract, reorder and split all work the same way: they create a new, empty PDF, copy the pages you want into it in the order you want, and save it. Because the pages are copied, not rendered again, text stays selectable and quality is untouched. Rotate is different: it changes a rotation setting on each page in the original file and saves it. That is why the two behave differently when it comes to size.
What happened to two test PDFs
We used a 3-page PDF with a different photo on every page (571 KB), and an 8-page text PDF where every page shows the same screenshot as a small letterhead, stored once and shared (261 KB).
| Operation | 3 photo pages (571 KB) | 8 pages sharing a letterhead (261 KB) |
|---|---|---|
| Delete one page | 416 KB (−27%) | 260 KB (−0.3%) |
| Extract page 1 only | 208 KB (−64%) | 256 KB (−2%) |
| Extract pages 1–2 | 364 KB (−36%) | 257 KB (−2%) |
| Reverse the page order | 571 KB (no change) | 261 KB (no change) |
| Rotate every page 90° | 571 KB (no change) | 261 KB (no change) |
| Split into one file per page, total of all files | 572 KB (×1.0) | 2,049 KB (×7.9) |
Why shared resources matter
A PDF stores each image and font once and lets pages refer to it. A letterhead logo, a company watermark or an embedded font can sit in the file a single time and be used by every page. When you copy one page into a new file, that page needs the logo, so the logo comes with it. In our test the logo was nearly the whole file, so a single extracted page was 256 KB. Splitting all 8 pages produced 8 files that each carried their own copy of the logo, for 2,049 KB in total.
With unique content, such as the photo PDF, none of this happens: each page's image goes only into the file that has the page, so the parts add up to the original (572 KB against 571 KB).
Rotating and reordering
These are free in size terms. Rotating adds a setting to each page, and reordering copies the same pages into a new file in the new order, so the size stays the same. One thing to keep in mind is that rotating changes how a page is displayed, not the page itself, and viewers and print workflows differ in how they treat a rotated page, so open the result in the program that will use it. The Rotate PDF and Reorder PDF Pages tools do the work in your browser.
A sensible order of operations
- Delete or extract first, with Delete PDF Pages or Extract Pages, so you never process pages you will not send.
- Fix orientation and order next, with Rotate and Reorder.
- Merge if needed, with Merge PDF. Remember that merging drops form fields and keeps duplicates; see the merging guide.
- Compress last, only if the file is image-based, and sign after that (see the signing guide).
- Open the final file and page through it to check the order, orientation and page count.
To break a document into several files, use Split PDF, but weigh the shared resource effect above if the total size matters. For text changes and annotations, the PDF Editor is the right tool.
What we did not test
We tested two PDFs we built, so the numbers show the pattern rather than a prediction for your file. The letterhead file is an extreme case of sharing, made to show the effect. We did not test what happens to bookmarks, links, annotations, form fields or page labels when pages are copied, nor password-protected files, and we did not compare other programs. These tools run in your browser, so your files are not uploaded.
