Repair a damaged PDF
Interrupted downloads, broken email attachments and buggy generators produce PDFs with structural errors. This tool re-parses the file in tolerant mode, skips invalid objects, and writes a fresh, standards-compliant copy. It can’t recover data that is physically missing, but it fixes many “file is damaged” errors.
How to use the Repair PDF tool
Select or drag the PDF that won’t open.
Click “Repair PDF” — the file is re-parsed in tolerant mode.
Download the rebuilt copy and try opening it.
Your files stay on your device
This tool runs entirely in your browser using JavaScript and WebAssembly. There is no upload step and no server processing — open your network panel and check: zero document data is transmitted. It even keeps working offline once the page has loaded.
Frequently asked questions
Can every broken PDF be repaired?
No tool can promise that. If bytes are physically missing (truncated download), the lost content cannot be invented. But errors in cross-reference tables, object numbering and metadata — the most common corruption — are usually fixable.
What exactly does the repair do?
It parses your file with error tolerance enabled (skipping invalid objects instead of failing), then rebuilds the document structure from scratch: new cross-reference table, clean object tree and valid header/trailer.
My PDF opens but behaves strangely — does repair help?
Often yes. Rebuilding normalizes duplicated objects, bad page trees and malformed annotations that cause odd behavior in some viewers.
Is it safe to use this tool with confidential documents?
Yes — and verifiably so. PDFAgent has no upload step: your file is processed by JavaScript running in your own browser and never leaves your device. You can open your browser’s network panel (or even go offline after loading the page) and confirm that no document data is transmitted.