The signed PDF refuses to open. The content might be important — possibly legally so. You need access but don't want to compromise the signature record.
What's actually going wrong
Signed PDFs can fail to open for the same reasons as any PDF — corruption, truncation, viewer issues. The signature adds complications: some recovery techniques (rebuilding via compression) invalidate signatures.
The goal is content access without permanently breaking signature evidence.
The quick fix
First, try multiple viewers. Open in Chrome, Edge, Acrobat, Preview. Browser viewers often open files desktop tools refuse. If any viewer succeeds, you have content access without modifying the file.
If no viewer opens it, you face a choice: prioritise access (rebuild via Flint, losing the signature) or prioritise signature record (keep file as-is, can't access). For most cases, content access wins.
If that didn't work
If you need the signature record preserved, keep the original file unchanged. Work from a copy for any recovery attempts. The original retains its evidence value even if currently unopenable.
For legal cases, consult counsel before any recovery action. The integrity of the original may matter more than current access.
Prevent it next time
Keep signed PDFs in multiple locations. Don't store only on cloud sync. And open signed PDFs immediately after receipt to verify they work — issues caught early are fixable through requesting resends.
FAQ
Will trying to fix a signed PDF destroy the signature?
Reconstruction (compression, OCR) breaks signatures. Read-only opening attempts don't. Try opening in different viewers first; only resort to rebuild if content access is essential.
Can I salvage just the content?
Yes, via rasterisation. PDF-to-JPG captures visible content regardless of signature state. The result has no signature but the content is preserved.
Is a broken signed PDF still legally valid?
Depends on jurisdiction and context. The signature evidence may be diminished. Consult counsel for legally significant documents.
Should I keep the broken original?
Yes, especially if the document is important. Even an unopenable file may have evidence value showing original state. Work from copies for recovery attempts.
Tread carefully with signed PDFs. Try Flint as a forgiving viewer first; rebuild only when access is essential.