Repair PDF Online Free — Fix Corrupted PDF Files

A corrupted PDF can be frustrating — especially when it contains important information. Our free online PDF repair tool rebuilds damaged PDF files, recovering your content whenever possible.

What Causes PDF Corruption?

PDFs can become corrupted due to incomplete downloads, failed disk writes, transmission errors, software crashes, or file conversion issues. Common symptoms include error messages when opening, garbled content, or the file refusing to open entirely.

How to Repair a PDF in 3 Steps

1. Upload — Go to our Repair PDF tool and select the corrupted file.
2. Repair — The tool analyzes and rebuilds the PDF structure automatically.
3. Download — Get your repaired, working PDF file.

The repair process uses pdf-lib to re-parse and reconstruct the PDF internal structure. Best results are achieved with mildly to moderately corrupted files.

Tips

• Always keep backups of important PDFs
• Try the repair tool even if your PDF viewer shows an error
• If repair fails, the file may be too severely damaged
• 100% free — no file size limits for premium users