01 / Fast steps
- Drop or pick the damaged PDF files.
- The structure is parsed and rewritten automatically.
- Download the repaired PDF and try opening it again.
Repair PDF
Drop a PDF that refuses to open or renders with errors: the file structure is parsed and rebuilt into a clean document.
drop your files anywhere in this area
Your files never leave your device.
PDF
02 / Best for
- Recover PDFs that viewers refuse to open.
- Fix files truncated by interrupted downloads or emails.
- Clean up PDFs produced by buggy generators.
03 / Why here
- Best-effort recovery: many structural problems (broken cross-reference tables, malformed objects) are fixed by a clean rewrite.
- Runs entirely in your browser, so the damaged file never leaves your device.
04 / Keep in mind
- Honest limits: if the page content itself is missing or destroyed, no tool can bring it back.
- Password-protected files cannot be repaired without the password.
Tool connections
Related tools
Just converted a file here? Click a tool that reads it and your new file is handed over automatically, no re-upload needed.
01Merge PDFCombine multiple PDF files into a single document, in the order you pick them, without uploading anything.02Sign PDFDraw your signature and place it on any page of a PDF, entirely in your browser: the document is never uploaded.03Rotate PDFRotate every page of a PDF by 90, 180 or 270 degrees, entirely in your browser.04Organize PDFReorder, rotate and delete PDF pages visually, entirely in your browser, so the file is never uploaded.05Watermark PDFStamp a diagonal text watermark like CONFIDENTIAL or DRAFT across every page of a PDF, in your browser.06PDF to TextExtract all text from PDF files, with automatic OCR fallback for scanned documents, right in your browser.
Good to know
Questions & answers
01What kind of damage can be repaired?
Structural damage: broken cross-reference tables, malformed objects, bad trailers. The parser reads what is recoverable and rewrites a clean file. Missing or overwritten page data cannot be reconstructed.
02What if the repair fails?
You get a clear error instead of a broken download. In that case the file is likely damaged beyond what any structural repair can recover.
03Is Repair PDF free to use?
Yes, Repair PDF is completely free, with no sign-up and no usage limits. It runs entirely in your browser, so your data never leaves your device.
04Why do PDF files get corrupted in the first place?
Almost always because the file was cut short: an interrupted download, a mail gateway that truncated the attachment, a USB stick pulled out mid copy, a cloud sync that stored a half written version. PDF is unusually sensitive to this because its table of contents, the cross reference table, lives at the end of the file. Lose the last few kilobytes and a reader no longer knows where any page starts, even though 99 percent of the document is still there. That is why a truncated PDF refuses to open at all instead of opening partially.
05Adobe Reader says the file is damaged and cannot be repaired. Is there still hope?
Often yes. Acrobat uses a strict parser: when the structure contradicts the specification it stops, it does not guess. This tool does the opposite on purpose: it reads leniently, collects every object that is still intact and writes a brand new structure around them. If the page data itself survived, the rebuilt file opens normally. If the bytes holding the pages are gone, nothing can bring them back, but the attempt costs nothing and runs in your browser.
06Does repairing change the content of my document?
No. The repair rewrites the scaffolding, meaning the cross reference table, the trailer and the object offsets, and keeps the objects themselves exactly as they were found. Nothing is re-rendered, re-compressed or invented: text, images and fonts that survived come out as they were, and anything lost stays lost rather than being silently replaced.