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Fix a PDF that won’t open, shows errors or looks broken, by rebuilding its internal structure.
QUICK ANSWER
To repair a PDF, add the damaged file and choose Repair this PDF. StackPDF rebuilds the file’s structure and saves a clean copy. It works when the PDF can still be read in part; a file that’s mostly missing can’t be recovered. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
StackPDF checks what’s wrong first. It stays in this browser.StackPDF checks what’s wrong first. It stays in this browser.
PDF files · Runs in your browser
QUICK ANSWER
To repair a PDF, add the damaged file and choose Repair this PDF. StackPDF rebuilds the file’s structure and saves a clean copy. It works when the PDF can still be read in part; a file that’s mostly missing can’t be recovered. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
HOW TO
Drop it here, or choose it from your computer, your phone or My files.
StackPDF checks the file and tells you what it found.
A rebuilt PDF that opens normally. Your original isn’t changed.
GOOD TO KNOW
Repair rebuilds the parts of a PDF that tell readers where everything is.
| PROBLEM | CAN IT BE FIXED? | WHY |
|---|---|---|
| Broken cross-reference table | Usually | The index can be rebuilt from the file’s contents |
| Download cut short | Sometimes | Pages that arrived are kept, the rest are lost |
| Forgotten password | No | Remove PDF password needs the password |
| File isn’t really a PDF | No | There’s nothing to rebuild |
If the file opens fine, there’s nothing to repair, and StackPDF tells you so.
PRIVACY
Yes. Repair PDF runs in your browser, so the file never leaves your device.
StackPDF opens the PDF in your browser tab and does the work there.
Close the tab and it’s gone. Free results download to your device. Premium can also keep them in My files.
pdf-lib, PDF.js and qpdf do the work, inside your browser.
FAQ
Add it here and choose Repair this PDF. StackPDF rebuilds the file’s structure and gives you a copy that opens normally.
Yes. The free plan includes 1 PDF export a day, with no account. Premium removes the daily limit for $5.99 a month or $39.99 a year.
No. The file is rebuilt in your browser, so it stays on your device.
No. Repair works when part of the file can still be read. A file that’s mostly missing, or isn’t really a PDF, can’t be recovered.
No. Repair rebuilds the structure that tells readers where everything is, and keeps the pages as they are. Your original isn’t changed.
Then there’s nothing to repair, and StackPDF tells you so. To make the file smaller, try Compress PDF.