How to repair a corrupted PDF
A PDF that won't open is usually not gone — it's structurally damaged. Interrupted downloads, email mangling, a full disk, or a crashed export can corrupt the file's internal index while leaving most of the actual content intact. Repair rebuilds that structure and recovers what's still there.
Open Repair PDFStep by step
- Open the Repair PDF tool and drop the damaged file in.
- The tool rebuilds the PDF's internal structure and recovers the readable content.
- Download the repaired file and check it page by page.
Why PDFs break
A PDF ends with a cross-reference table telling readers where every object in the file lives. If a download is cut off or a program crashes mid-save, that table is missing or wrong, and viewers give up even though the pages themselves are mostly fine.
Repair reconstructs the file: it scans for the surviving objects and rebuilds the index around them. If the content bytes survived, you get the document back; if parts are truly missing, you get everything that's left.
What recovery can and can't do
Structural damage (won't open, 'file is damaged' errors, viewer crashes) has good odds. Truncated files recover up to the point of truncation — a download that stopped at 80% can often yield most of its pages.
No tool can recover bytes that were never written or were overwritten. If repair returns little, try re-downloading from the source or checking for an earlier copy — and if the file was important, keep the damaged original in case a specialist tool does better.
FAQ
- Will I get all my pages back?
- If the damage is structural, usually yes. If part of the file's data is actually missing (a truncated download), you recover what survived, which is often most of it.
- What happens to my file?
- It's repaired on the server in a temporary folder, returned to you, and deleted right after. Nothing is kept.
- The repaired file is still broken — now what?
- Re-download or re-export from the original source if you can. Keep the damaged original; different tools recover different things, and a second attempt costs nothing.