Two people signed the contract. Three. Five. You open the file and see only the first one. The others are missing from view.
What's actually going wrong
Flattening order. An earlier signer flattened the file, locking subsequent signatures into a layer that later signers couldn't overlay. Annotation layer confusion. Each signer placed in a different annotation layer; only some render. Wrong field assignment. Multi-signer templates assign each signer to a specific field; signers placed in wrong fields appear elsewhere or invisibly.
The quick fix
If signing is in progress, don't flatten until the last signer. Each signer adds without flattening; final signer flattens.
For PDFs where flattening already happened mid-process, the missing signatures may be unrecoverable. Get the last unflattened version (the file as it existed before flattening) and have everyone sign that version.
Use Flint's sign tool for multi-signer workflows — Flint handles multiple signature layers cleanly without premature flattening.
If that didn't work
If signatures genuinely don't exist in the file (signers thought they signed but the action didn't take), they need to sign again on a fresh version.
For multi-party legal documents where signature evidence matters, audit the file's signature record carefully. Each signature should appear in the signature panel of a capable viewer (Acrobat, Foxit).
Prevent it next time
Use signing platforms designed for multi-signer workflows (DocuSign, HelloSign, Flint). Don't flatten mid-process. Always verify all signatures appear before treating the document as complete.
FAQ
Can multiple signatures stack on one PDF?
Yes — PDFs support multiple sequential signatures. Each commits to the file state at signing including prior signatures.
Why does flattening cause missing signatures?
Flattening locks the file. Subsequent edits (including additional signatures) either invalidate the locked signature or appear in a separate layer some viewers don't render.
Should I use a dedicated multi-sign tool?
For 3+ signers, yes — managing flattening, signature order, and validation manually is error-prone. Flint or similar tools handle the orchestration.
How do I verify all signatures are present?
Open in Acrobat or another signature-aware viewer. The signature panel lists every signature with status. If a signer says they signed but the panel doesn't show it, their signature didn't take.
Multi-signer PDFs need careful handling. Sign with Flint for clean layered signatures.