A PDF that won't open, throws an error, or shows blank pages often has a damaged internal structure rather than lost content. PDF Cubby rebuilds that structure to recover as much of the file as possible — worth attempting before you give up on it. Nothing is kept afterward.
How to repair pdf
Add the broken PDFChoose the file that won't open or behaves strangely.
RepairRun it — the internal structure is rebuilt and cross-references are salvaged.
Check the resultOpen the recovered file and confirm the pages are back.
DownloadDownload the repaired PDF. It's gone from our side the moment you do.
What you can do
- Open a file that shows “cannot be opened”
- Recover a PDF that downloaded incompletely
- Fix a document with blank or garbled pages
- Salvage an old archived file that stopped working
- Rescue a PDF a program exported badly
What happens to your file
Your files are never stored. Nothing is parked, queued, or kept — the moment your download is ready, it's gone, and no one ever sees it.
Plenty of online tools store your file on their servers and delete it later. PDF Cubby doesn't keep it at all — there's nothing left behind to clean up afterward.
Features
- Rebuilds structure and cross-reference tables
- Recovers what's recoverable from a damaged file
- No install — just add the file and go
- 5 free a day — unlimited with Pro ($4.99/mo, cancel anytime)
- Never stored — nothing kept afterward
Tips
- Repair can't invent content that's truly gone — but structural damage is very often fixable.
- If it opens but looks heavy afterward, run Compress.
- Recovered a big file in pieces? Put them back with Merge.
Frequently asked questions
- Are my files kept after a repair?
- No. Your file is never stored — the instant your recovered PDF is ready, everything is gone and no one sees it.
- What kinds of damage can it fix?
- Structural problems — broken cross-reference tables, bad exports, incomplete downloads. These are the most common reasons a PDF won't open.
- Can it always recover my file?
- Not always. If page content is genuinely lost it can't be recreated, but structural damage is very often repairable — it's worth attempting.
- Will the repaired file look the same?
- When recovery succeeds, yes — the pages come back as they were.
- Is there a size limit?
- No hard limit — larger files just take a little longer.
- Do I need an account?
- You get 5 free uses a day with no account. For unlimited use, sign in and upgrade to Pro — $4.99/month, cancel anytime. The 6 core tools (merge, split, extract, rotate, compress, convert) are always free and unlimited.
- Is my original changed?
- Never — you download a new recovered file and the source stays as it was.