Sign PDF

Use Sign PDF in a reliable PDF workflow

The signing tool places a drawn or uploaded signature image on a chosen page. It is useful for visible approval and routine forms, but it is not the same as a certificate-based digital signature that cryptographically verifies identity and detects later changes.

When this tool is useful

Use it for permission slips, acknowledgements and documents where the recipient accepts an image signature. Position and resize the mark carefully, and add the date or printed name separately when the form requests them.

What to check before downloading

Download and reopen the PDF to confirm that the signature appears on the correct page and does not cover important text. For regulated contracts, qualified signatures or identity verification, follow the recipient’s required signing process.

Private browser processing and practical limits

Processing runs locally in the current browser tab, so the selected document is not sent to PDF Online Free for editing. Performance depends on the device, available memory, document complexity and browser. Large or unusual PDFs may take longer or may exceed the memory available on a phone. Work on a copy, allow the process to finish before closing the tab, and review the downloaded result before relying on it.

Continue your PDF workflow

A PDF task often needs more than one step. Use the related tools below only after checking the output from the current step; this makes it easier to identify where a change occurred. Organize PDF, Compress PDF, Password Protect PDF and all PDF tools.

Place a visible signature without confusing it with a digital signature

This tool places a drawn, typed or image signature visibly on the page. It is useful when a recipient asks for a signed-looking copy, but it is not the same as a certificate-based digital signature that cryptographically identifies a signer and detects later changes.

• Confirm that the recipient accepts this type of signature before submitting.
• Place the mark inside the intended signature field without covering nearby text.
• Add the date or printed name separately when the form requires them.

Consent, authority and reusable signature images

Only sign for yourself or when you have clear authority to act for another person or organization. A saved signature image is sensitive because anyone who obtains it may reuse it. Prefer drawing it for the current task, protect stored images, and do not leave them in shared download folders or devices.

Review the complete document after signing

Read the document before adding a signature and keep a copy of the version you agreed to. After export, reopen the downloaded file and verify the correct page, position, scale and orientation. Check that no text was covered and that all pages are present. If identity assurance, audit trails, timestamps or tamper evidence are required, use the certificate-based signing service specified by the recipient or responsible institution.