What kinds of PDF corruption can this fix?

This tool targets structural issues — a malformed cross-reference table, truncated file data, or an incomplete write from an interrupted download or save — by attempting to rebuild the file's internal object structure from whatever valid data remains.

Will repair always fully recover the file?

Not always — recovery depends on how much of the original file structure is intact. Files with severe or extensive corruption may only be partially recoverable, and the tool will show you which pages it was able to reconstruct.

Why won't my PDF open in a normal viewer, but this tool can still read it?

Many PDF viewers refuse to open a file at all if its structure doesn't perfectly match the specification, even if most of the content is actually intact and readable. This tool attempts a more permissive parse to recover what it can rather than rejecting the whole file outright.

Is there a specific cause of PDF corruption this can't handle?

If the underlying file data itself is missing or overwritten (as opposed to just structurally malformed), no repair tool can recreate content that no longer exists in the file — repair works with whatever bytes are actually present.

Does repairing change the content of pages that weren't damaged?

No, undamaged pages and content are preserved exactly as they were — the repair process only rebuilds structural elements that were broken, not content that was already fine.

Is my file uploaded to a server?

No. Every operation on this page runs locally in your browser using JavaScript and WebAssembly. Your file is never transmitted anywhere, which also means it works without an internet connection once the page has loaded.

Repair PDF

Attempt structural recovery of a damaged or corrupted PDF file.

Processed entirely in your browser — your file is never uploaded anywhere.

Why repair PDFs with Tools Root

A PDF that won't open — because of an interrupted download, a corrupted transfer, or a bug in whatever software created it — is a genuinely stressful problem when the file matters. Repair attempts to reconstruct enough of the file's structure to get the document usable again, rather than leaving you with nothing.

A more permissive parse than standard viewers

Many mainstream PDF readers are strict: any deviation from the exact specification and they refuse to open the file at all, even if 95% of the content is intact. This tool takes a different approach, attempting to recover whatever valid structure and content remains rather than failing outright.

Common use cases

Recovering a PDF that got corrupted during an interrupted download, fixing a file that a buggy export tool wrote incorrectly, salvaging content from a PDF damaged during file transfer, or attempting recovery on an old file that no longer opens in modern software.

How to repair a corrupted PDF

1Upload the damaged or corrupted PDF.
2The tool attempts to parse and rebuild the file's internal structure.
3Review which pages were successfully recovered.
4Download the repaired PDF.

Frequently asked questions

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