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# Description of Changes **What was changed** - Reworked Multi-Tool export to **group page copies per source PDF** and reuse them during assembly. - Eliminates repeated embedding of identical resources (fonts, XObjects, images) that previously occurred when copying pages one-by-one. - Keeps original vector content whenever possible instead of rasterizing unchanged pages. - Minor internal refactor to reduce repeated `copyPages` calls and add pages from a pre-copied cache. **Why the change was made** - Users reported that exporting a PDF via Multi-Tool—without making any edits—could inflate file size by 5x+. - Root cause: exporting pages individually caused duplicated resources in the output document, dramatically increasing size. - Grouping and reusing copied pages avoids redundant embeddings and yields output sizes much closer to the original. Closes #4681 --- ## Checklist ### General - [x] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [x] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md) (if applicable) - [x] I have performed a self-review of my own code - [x] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing) for more details. |
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