How to sign a PDF for free — typed, drawn, or uploaded — that recipients accept
Signing a PDF is two different things: drawing your name on the page (a visual signature) and applying a cryptographic seal (a digital signature). Most online tools only do the first. The visual signature is what 99% of business workflows actually require, and it's what we offer for free. Here is how to sign correctly so the result is accepted by counterparties, courts, and contract platforms.
Visual signatures vs. digital signatures
A visual signature is a graphical mark on the page — typed in a script font, drawn with a mouse or finger, or uploaded as an image of your hand-signed name. It's legally binding for nearly all business transactions in most countries (US ESIGN Act, EU eIDAS for simple e-signatures, UK ECA, similar laws elsewhere). It does not, by itself, prove the file hasn't been tampered with after signing.
A cryptographic digital signature uses a certificate (issued by a CA, or self-signed, or via a workflow service) to lock the file's bytes at the moment of signing. Tampering after signing is detectable. Required only for high-stakes scenarios: court filings in some jurisdictions, regulatory submissions, certain financial transactions. Our free tool produces visual signatures; for cryptographic signing we recommend integrating with DocuSign, Adobe Sign, or our API's certificate workflow.
When the free signer is enough
The free visual signer covers most everyday needs:
- NDAs, MSAs, and standard business contracts. Counterparty just needs your signed copy back. Visual signature is fine.
- Employment paperwork, offers, onboarding. HR systems accept signed PDFs as proof.
- Vendor agreements and quotes. Procurement workflows usually only require a signed PDF on file.
- Internal policies and acknowledgments. Read-and-sign policy attestations, code of conduct sign-offs, etc.
- Permission and consent forms. School trip forms, photo releases, etc. — most don't require cryptographic signing.
Common mistakes
Patterns that come up repeatedly in rejected or invalidated signed PDFs:
- Signing a flattened PDF you can't unflatten. Once flat, you can't move or remove the signature. Sign on the working copy, then flatten if needed.
- Date doesn't match. If your signature shows today's date but the document is dated last week, recipients sometimes reject. Use the date field that matches the document, or leave the date blank.
- Signing on the wrong page. Most contracts have a specific signature block. Use the form-fill detector to find it rather than placing your signature manually.
- Initialing every page when the contract only requires the last. Initials on every page is a habit, not a requirement. Read the agreement's signature instructions before initialing 30 pages.
- Trusting the visual signature alone in disputes. Visual signatures are legally binding but not tamper-proof. For high-value contracts, use a cryptographic signing service.
Tips for clean signatures
Signatures that look professional in business contexts:
- Upload a real handwritten signature. Sign on white paper, take a phone photo, upload. The result looks more legitimate than a script-font typed name.
- Save your signature for reuse. Once uploaded, save it to your account so you can sign future PDFs with one click. Keep your saved signature in a private profile, not shared.
- Match signature size to surrounding text. A 200-pt signature on a 10-pt contract looks unprofessional. Drag-resize so the signature is roughly the same height as the printed name beneath it.
- Sign last, after all other edits are final. Any edit after signing visually is fine, but it makes the signature look hastily added. Make all edits first, sign last.
- Flatten and save with a clear filename. filename-signed-2026-04-25.pdf is more useful than filename-final-final-3.pdf.
Limits and compatibility
Free tool: any PDF up to 100 MB, unlimited signatures per document, unlimited documents per day. Output opens in every reader. For cryptographic signing, see the API docs or the AI Sign & Fill tool which integrates with certificate workflows.