How to Repair a Corrupted PDF File
A PDF that will not open is frustrating — especially if it is important. Often the file is only slightly damaged and can be rebuilt. KOIAE's Repair PDF tool tries to fix the file structure so your document opens again — free.
How to repair a corrupted PDF
- Open the Repair PDF tool. Go to the KOIAE Repair PDF page.
- Upload the damaged PDF. Drag and drop the file that will not open.
- Repair the file. KOIAE rebuilds the internal structure of the PDF.
- Download the fixed PDF. Download a version that should open normally.
Tips for the best results
- Repair works best on lightly-damaged files.
- Always keep a backup of the original.
- If a download was interrupted, try downloading it again first.
Why use KOIAE Repair PDF?
KOIAE Repair PDF is completely free — there is no account to create, no watermark on your files and no daily limits for everyday use. Most processing happens right in your browser, so your documents stay private, and it works on any device from Windows and Mac to Android and iPhone.
Frequently asked questions
Can every corrupted PDF be fixed?
Lightly-damaged files usually can; severely corrupted files may be unrecoverable.
Will I lose content?
KOIAE tries to preserve as much of the document as possible.
Is it free?
Yes, with no watermark.
Related tools: Merge PDF · Compress PDF · Compare PDF · All PDF tools