Fix corrupted or damaged PDF files.
Fix corrupted PDF files by rebuilding their internal structure. All processing happens in your browser.
Free users limited to 10MB files.Upgrade for 100MB
The repair tool rebuilds a PDF that has become damaged, producing a fresh, valid file from whatever is recoverable inside it. If a document will not open, shows garbled pages, or throws an error in your viewer, this tool reloads it and writes a corrected version. Processing happens entirely in your browser, so the file never travels anywhere else.
A PDF is a structured container, and several ordinary events can leave it broken. Downloads that cut off midway, uploads interrupted by a closed tab, cloud clients that overwrite a file mid-write, a computer that shuts down while saving, and bugs in PDF-producing software can all damage the internal structure. The result is a file that looks normal in the folder listing but refuses to open, or opens with missing text, blank images, or scrambled pages. None of that means the content is gone; the parts are usually still there and simply need the container rebuilt around them.
The tool tries two passes at loading the file before giving up. If even the second attempt fails, it reports that the file may be too corrupted to fix rather than quietly producing a useless document. When the repair succeeds, the progress messages make it easy to tell which stage finished, so an unusually long analysis step does not look like a freeze.
Think of it as restoring the table of contents of a book whose pages survived a spill. The repair does not rewrite the pages; it puts the references back in order so readers can find and open them again.
Repair is the right first step when a file will not open at all. If the PDF opens but the content looks wrong, the trouble is more likely in the source, and re-exporting from the original document is usually faster than patching the result. When a file fails everywhere, run it through the repair tool once before you give up and redo the work from scratch. If the repaired copy is missing a page or two, compare it against a fresh download of the original before assuming the repair failed, since the source file may have been incomplete to begin with.
Pro tip
Keep a backup of the original file before you repair. The repaired version is a new file, so holding onto the original lets you try again later, compare the two versions, or fall back if the repair is incomplete.
The entire operation runs locally using a PDF library loaded into the browser. Your document is never transmitted or stored on a server, which matters when the damaged file contains personal data you would rather not send anywhere to be fixed. Free users can repair files up to 10 MB with a short wait; Premium subscribers get a 100 MB limit and no wait, which is useful when a large document needs to be back in service immediately.