Eliminar Páginas de PDF

Implementation & Processing Pipeline

Deleting pages from a PDF involves modifying the internal "Page Tree" structure without destroying the validity of the file. The resulting PDF maintains all other content intact while excluding the deleted pages.

This tool uses PDF-lib for browser-based PDF manipulation. It performs a "clean" removal, ensuring that:

1. Structure: The Kids array in the PDF catalog is updated to remove references to the deleted pages.
2. Resources: Unused fonts or images associated only with the deleted pages are strictly orphaned (though not always fully garbage collected until optimized).
3. Validity: The cross-reference table (XREF) is rebuilt to ensure the file opens correctly in all readers.

How It's Tested

We ensure that deleting a page doesn't corrupt the rest of the document.

1. The "Range" Logic Check:
   • Action: Request to delete pages 2-4 from a 10-page document.
   • Expected: The output file must have exactly 7 pages (Original 1, 5, 6, 7, 8, 9, 10).
2. The "First/Last" Boundary Test:
   • Action: Delete Page 1 (Cover) and Page 10 (Back).
   • Expected: The document opens without "File Corrupted" errors, starting immediately at old Page 2.
3. The "Metadata" Preservation:
   • Action: Delete a page from a signed or tagged PDF.
   • Expected: The global metadata (Author, Title) remains intact.
4. The "Zero-Page" Prevention:
   • Action: Attempt to delete all pages (e.g., 1-10 of 10).
   • Expected: The tool should show an error or prevent the action, as a PDF must have at least one page.

The History of PDF Editing

Originally, removing pages required expensive desktop software like Adobe Acrobat. The PDF specification (ISO 32000) is complex; simply cutting bytes from the file destroys it. Tools like pdftk brought this to the command line, and now libraries like PDF-lib bring this capability securely to the browser.

Deletion Methods

Impact on Document

• ⚠️ Table of contents page numbers (not updated)
• ⚠️ Internal links to deleted pages (become broken)
• ✅ Remaining content is fully preserved