How to Fix a Corrupt or Unreadable PDF File
To fix a corrupt PDF, upload it to the Repair PDF tool, which attempts to rebuild the document's internal structure (its cross-reference table and object streams) from whatever valid data remains — this recovers many PDFs damaged by an interrupted download, a failed save, or a buggy export. It cannot recover data that was never written to the file in the first place, such as pages lost during a genuinely incomplete save.
Common causes of a corrupted PDF
An interrupted download or file transfer, a crash during export from another program, a disk error during save, or an email attachment corrupted in transit are the most frequent causes. The symptom is usually the same: your PDF viewer shows an error like "file is damaged" or simply refuses to open it.
Step-by-step
1. Open the Repair PDF tool and upload the affected file.
2. The tool scans the file's internal structure and attempts to rebuild what's readable.
3. Download the repaired file and check whether all expected pages and content are present.
Setting realistic expectations
A repair tool can often recover a PDF that's structurally damaged but whose page data is still physically present in the file. It cannot invent missing pages or reconstruct data that was truncated before it was ever saved — if repair doesn't fully restore the document, going back to the original source (the scanner, the export, or a backup) is the next step.