Repair PDF: What It Can and Can’t Recover

A PDF can become unreadable for a few reasons: a broken cross-reference table, a truncated download, or minor structural corruption. Repair PDF works by loading the damaged file, copying every page it can still read into a brand-new, cleanly structured document, and saving that as your repaired file.

Step-by-step: repairing a PDF

1. Upload the corrupted or damaged PDF.
2. Repair to rebuild the file.
3. Check the summary — it reports how many pages were recovered.
4. Download the repaired file.

What this can and can't fix

Rebuilding the document from scratch works well for structural issues — broken cross-reference tables, redundant or malformed internal objects, files that a strict PDF reader rejects but that still contain readable page data. It cannot recover data that's genuinely missing, such as a file truncated mid-download where entire pages were never saved, and it cannot repair or bypass real encryption on a password-protected file.

How to tell if the repair worked

The recovered page count shown after processing tells you directly how many pages the tool could actually read and rebuild — if that number matches what you expected, the repair worked completely; if it's lower, some pages couldn't be recovered.

Troubleshooting

• "The recovered page count is lower than expected." Some pages were too damaged to read — this reflects a real limit on what can be recovered, not a tool malfunction.
• "The file still won't open after repair." If the original file is password-protected or encrypted, this tool can't process it — remove protection first if you have the password, or the corruption may be too severe for structural repair alone.
• "Repair succeeded but some formatting looks different." Rebuilding from scratch can occasionally lose non-essential structural elements even while text and images are preserved — compare the result against what you need before relying on it.

Ready to try it? Open the free Repair PDF tool.