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Free private PDF signature tool
Sign PDF Online – Add Your Signature Privately
Place a visible signature on a PDF directly in your browser. Create, draw, type or upload a signature when supported, position it on the correct page and download the signed document without creating an account.
Free to use
No signup required
Local browser processing
Files stay on your device
Approval document
✓ Signature placed
Your Signature
Add your signature now
Upload a PDF and Place the Signature
Select the document, create or add the signature using the available method, then position it through the tool below.
How to add a signature
Sign a PDF in Three Simple Steps
The workflow adds a visible signature element without requiring desktop software.
Create or Add the Signature
Use the available drawing, typing or image method offered by the live tool.
Position and Download
Place the signature correctly, review the page and save the signed PDF.
Common signing situations
When Can a Visible PDF Signature Help?
A visible signature is useful when a document needs a clear sign-off, acknowledgment or approval mark.
Approval Forms
Add a visible sign-off to a form or internal approval document.
Agreements and Letters
Place a signature where a recipient expects your acknowledgment.
Consent Documents
Add a visible signature to a document when the receiving party accepts this method.
Internal Records
Mark reviewed or approved documents for routine organizational workflows.
Private browser processing
Place Supported Signatures Without an Unnecessary Server Upload
AOI PDF Tools processes compatible documents locally inside your browser. This helps the selected PDF and signature element remain on your device during placement.
What stays local?
- The PDF selected for signing
- The signature you draw, type or upload
- The signed output before download
What should you verify?
- The signature belongs on the selected document
- The correct person is authorized to sign
- The placement and size are clear before saving
Use the method available in the tool
Common Ways to Create a Visible Signature
The live interface may support one or more methods. Use only the options that actually appear in the tool.
Draw a Signature
Use a mouse, trackpad, touchscreen or stylus when drawing is supported.
Type a Signature
Enter your name and choose an available signature style when provided.
Upload a Signature Image
Add a prepared signature image only when the live tool supports image uploads.
Review before finalizing
Tips for a Clean and Clear Signature
Correct placement and readable sizing make the signed document easier to understand and review.
Before placing the signature
- Confirm the document is complete and final
- Check the correct signer name and role
- Find the intended signature line or field
- Review every page for missing information
Before downloading
- Keep the signature inside page boundaries
- Use a size that remains readable at normal zoom
- Check that no text is covered accidentally
- Open the downloaded file before sending it
Important:
This tool adds a visible signature element. It does not claim to verify identity, issue a digital certificate, provide a qualified electronic signature or guarantee legal enforceability. Requirements vary by document, recipient and jurisdiction.
Understand the signing method
Visible Signatures and Certificate-Based Digital Signatures
These methods are not automatically the same. Choose the process required by the receiving organization.
| Signing feature | Guidance |
|---|---|
| Visible signature placement | Adds an image, drawing or styled text element to a page when supported. |
| Identity verification | The tool does not claim to verify the signer’s identity. |
| Digital certificate | A certificate-based cryptographic signature is not claimed unless the live tool explicitly provides it. |
| Legal acceptance | Acceptance depends on the document, parties, organization and applicable law. |
| Document integrity | Review the finished PDF carefully and protect it when further changes should be discouraged. |
| Existing password protection | Use Unlock PDF first only when you know the password and have permission. |
Continue the document workflow
Related PDF Tools
Use these tools to edit, protect, flatten, redact or organize the document before or after signing.
Questions about signing PDFs
Frequently Asked Questions
Clear answers about privacy, signature methods, legal acceptance, certificates and mobile use.
Can I sign a PDF online for free?
Yes. AOI PDF Tools lets you place a supported visible signature without purchasing software or creating an account.
Are my PDF and signature uploaded to your server?
Supported files are processed locally inside your browser. The PDF and signature element are not intentionally uploaded for signing.
Can I draw, type or upload a signature?
Use whichever methods are offered by the current live interface. Not every method may be available.
Is the signature automatically legally binding?
No universal guarantee can be made. Acceptance depends on the document, parties, organization and applicable law.
Does this create a certificate-based digital signature?
Not unless the live tool explicitly provides and identifies certificate-based signing. A visible signature image is different.
Can I sign a password-protected PDF?
The file may need to be unlocked first. Only remove protection when you know the password and have permission to modify the document.
Does Sign PDF work on mobile devices?
Yes. The page is responsive, and a touchscreen can be useful for drawing a signature when that option is supported.
Add Your Signature to the Correct PDF Page
Create or add the signature, place it carefully and download the signed document through a private browser workflow.