You signed the PDF, then made a small edit. The signature is now invalid. You want to restore trust.
What's actually going wrong
Re-signing isn't restoration. The original signature stays invalidated forever. Re-signing adds a new signature on the current file state, providing fresh authentication from this point forward.
If the original signer's identity matters (legal contract from specific party), only that party can re-sign for valid authenticity. If your authentication is acceptable, you can re-sign.
The quick fix
Open the PDF in Flint's sign tool. Make any final edits first. Place your signature. Save the flattened result.
The new file has your signature committing to its current state. The old broken signature record may still appear in viewers; the new signature is what's currently valid.
If that didn't work
If the original signer's authentication is required, contact them. They sign a fresh version after your edits, providing renewed authentic signature.
For multi-party signed documents, every signer needs to re-sign after edits to restore full validity. Edits in mid-flow break the entire signature chain.
Prevent it next time
Finalise edits before any signing. Sign last. If edits are needed after, work from an unsigned copy and sign the new final version.
FAQ
Does re-signing remove the old signature warning?
Usually no — the old signature record stays, showing as invalid. The new signature shows as valid for current state. Both visible in signature-capable viewers.
Can multiple signatures coexist?
Yes, with caveats. Each subsequent signature commits to the file state including prior signatures. Order matters; edits between signatures break later ones.
Is re-signing legally valid?
It's a new signature, treated as such legally. If your authentication is sufficient for the use case, re-signing works. Some contexts require the original signer's authentication; for those, only they can re-sign.
Should I always re-sign after edits?
If signature validity matters and you can sign legitimately, yes. If the file doesn't need ongoing signature validation, you can leave it as-is.
Fresh signature for current state: Sign with Flint. Add your authentication after edits.