No upload, 100% local, no account

Repair a damaged PDF

Load a PDF and rebuild it into a clean copy. Everything stays in your browser, no file is sent to a server.

How Repair PDF works

PDF Repair rebuilds a damaged or bloated PDF by reading its structure and writing a clean, standards-compliant copy. The result is a file that opens reliably in any viewer, with redundant or corrupted cross-reference tables rewritten, unused objects removed and linearisation applied for faster page-by-page loading.

It is not a magic fix for every broken PDF, severely truncated or encrypted files whose keys are missing cannot be recovered, but it resolves the most common issues: files that fail to open, display blank pages, or were inflated by repeated saves. It is not a compression tool, so for dedicated size reduction use PDF compress instead.

Frequently asked questions

What kinds of damage does it fix?

Corrupt or out-of-date cross-reference tables, unreferenced objects left by editing tools, structural bloat from repeated saves without garbage collection, and minor header/trailer inconsistencies. Severely truncated files or those with missing encryption keys cannot be recovered.

Will the repaired PDF look identical to the original?

Content is preserved; the repair rewrites structure and removes garbage. In rare cases a corrupt object that was previously masked by a viewer's error-handling may become visible once structure is corrected.

My PDF is huge but not broken, can repair reduce its size?

Repair removes unreferenced objects and may help, but it is not a compression tool. For dedicated size reduction, image downsampling, font subsetting, use PDF compress instead.

Are my files uploaded to a server?

No. Every operation runs inside your browser tab using JavaScript and WebAssembly. Your file is read into memory on your own device, processed there, and the result is offered as a local download. Nothing is transmitted to Sunasty or any third party. You can verify it yourself: open your browser DevTools, go to the Network tab, and watch, no request carries your file.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.