Repair PDF

Re-reads a damaged PDF leniently and rebuilds its internal structure into a clean file.

No upload — runs on your device
Free, no sign-up
No watermark

What Repair PDF does

Re-reads a damaged PDF leniently and rebuilds its internal structure into a clean file. A PDF can become damaged or fail to open due to an incomplete download, a corrupted cross-reference table, or minor structural errors introduced by the software that created it. This tool re-reads the file leniently and rebuilds its internal structure into a clean file, resolving many common cases of minor corruption — though damage like missing page content or a severely truncated file can't always be reconstructed.

Works well with: Compress PDF · Organize PDF · OCR PDF

Runs 100% in your browser

PDFHook processes this file using JavaScript on your own device. It's never uploaded, stored, or seen by anyone else — and it works even if your connection drops mid-way.

HOW TO USE IT

Repair PDF in 3 steps

Upload the damaged PDF

Choose a file that won't open properly or shows errors.

Repair runs automatically

The file is re-read leniently and rebuilt.

Download the repaired PDF

Try opening it again — many common issues are now fixed.

Key features

Fixes many cases of minor corruption
Rebuilds the file's internal structure
Works entirely in your browser
Works entirely in your browser, nothing uploaded
Rebuilds internal file structure rather than just patching the original

Practical use cases

A PDF downloaded over an unstable connection fails to open and needs repair.
A file created by an older or buggy tool has minor structural errors preventing it from opening in some viewers.
Someone has a PDF that opens in one viewer but not another, and wants a more universally compatible version.

Related terminology

Cross-reference table: A PDF's internal index mapping each object (page, image, font) to its location in the file — damage here is a common cause of a PDF failing to open.

Frequently asked questions

What kinds of damage can this fix?

Issues like a missing or corrupted cross-reference table, dangling references, or minor structural errors — the kind that make a PDF fail to open in some viewers.

What if the file still won't open afterward?

Some damage — like missing page content or a truncated file — can't be reconstructed automatically.

Can this recover a file that was never fully downloaded?

A truncated or incomplete file often can't be fully reconstructed, since the missing data simply isn't present anywhere to recover from.

Is my original file modified during repair?

No — the original file on your device stays untouched; the tool produces a new, repaired file for you to download separately.

Is there a free tool to fix a PDF that won't open?

Yes — this rebuilds the file's internal structure for free, which resolves many common cases of a PDF that won't open due to minor corruption.

Is there a free way to fix a corrupted PDF file?

Yes — this PDF repair tool online is free; it works to fix corrupted PDF files, recover damaged PDF structure, and repair broken PDF file issues — including many cases of a fix PDF that won't open problem.