Repair PDF
Fix corrupted or damaged PDF files that fail to open, display errors, or render blank pages. If your PDF opens partially or crashes, try this tool to recover it.
How to Repair a PDF
1.
Upload PDF – Drop the corrupted or damaged PDF file into the upload area.
2.
Repair – Click the Repair PDF button. The tool scans the file structure and attempts to fix internal errors.
3.
Download – Save the repaired PDF with recovered content.
What Causes PDF Corruption
PDFs can become corrupted for several reasons: interrupted downloads, failed email attachments, storage drive errors, or software crashes during file creation. A corrupted PDF may refuse to open entirely, display an error message in your PDF reader, render blank or garbled pages, or crash your viewer. The repair tool analyzes the internal structure of the file and attempts to reconstruct the damaged components so the content can be accessed again.
What the Repair Process Can Fix
The tool targets structural issues in the PDF file format — broken cross-reference tables, damaged page trees, invalid object streams, and missing end-of-file markers. It rebuilds these internal structures from whatever valid data remains in the file. Text, images, and page layout are preserved when the underlying data is intact. However, if the actual content data (image bytes, font data, text streams) has been physically overwritten or zeroed out, that content cannot be recovered.
When Repair Won't Work
Severely truncated files (e.g., a download that stopped at 10% completion) contain too little data to reconstruct. Encrypted PDFs that are also corrupted may need to be unlocked before repair can be attempted. If the repair succeeds but the output still looks wrong, the file may need manual inspection. For PDFs that simply won't open due to password restrictions rather than corruption, use the unlock PDF tool instead.
Frequently Asked Questions
What types of PDF damage can this tool fix?
The tool repairs structural damage: broken cross-reference tables, damaged page trees, invalid object streams, and missing end-of-file markers. It cannot recover content data that has been physically overwritten or zeroed out.
My PDF opens but shows blank or garbled pages. Can this fix it?
Possibly. Blank or garbled pages often indicate a damaged page tree or broken content stream references. The repair tool rebuilds these structures. If the underlying content data is intact, the pages should render correctly after repair.
Can I repair a password-protected PDF?
If the file is both encrypted and corrupted, try unlocking it first. If the file won't open at all due to corruption, the repair tool may be able to fix the structure before you attempt to remove the password.
Will the repair process change my document's content?
No. The tool only fixes internal PDF structures. It does not modify, add, or remove any text, images, or page content. What you get is the original content reconstructed from the valid data remaining in the file.
My PDF was only partially downloaded. Can it be repaired?
This depends on how much of the file was downloaded. If the download stopped very early (e.g., under 20%), there is likely insufficient data to reconstruct the document. Re-downloading the file is the best option in this case.
Is my PDF corrupted or just locked?
If your PDF reader shows a 'password required' dialog, the file is locked — not corrupted. Use the unlock PDF tool instead. If the reader shows an error message or crashes, the file is likely corrupted and should be repaired.
Can I repair PDFs that crash my viewer on opening?
Yes. Crashes on opening are typically caused by structural errors such as broken cross-reference tables or circular page references. The tool scans for these issues and attempts to reconstruct a clean, openable file.
Does the tool guarantee full recovery?
No. Recovery depends entirely on the extent and type of damage. The tool maximizes recovery from the valid data remaining in the file, but severely damaged or truncated files may not be fully recoverable.