To use Sign PDF to add a handwritten signature to a PDF, select the file, draw the signature, choose its position and page, apply it, and download the signed copy.
The browser-based Sign PDF tool performs that workflow locally. Your document and drawn signature are processed with JavaScript inside the page, so the files are not uploaded to a server. There is no account to create, no email address to provide, and no watermark added to the finished document.
“Fill” can be misleading in this context. The supported operation is adding a visual handwritten signature to an existing PDF. It is not a general PDF form filler: the tool does not type into text fields, select form checkboxes, collect signatures from other people, or issue certified electronic signatures. Blank fields must be completed separately before you add your signature.
What the PDF signing tool can complete
The complete supported workflow covers four tasks:
- Select a PDF: Browse for a document and view its page count after it is read locally.
- Create a signature: Draw with a mouse, trackpad, stylus, or finger, and adjust the ink color and pen width.
- Choose a target: Select one of five preset positions and the page that should receive the signature.
- Save the result: Apply the signature and download a standard PDF containing the document and the transparent signature image.
Those limits make the tool suitable for personal letters, approvals, internal sign-offs, simple agreements, and other documents that can accept a visible signature image. A document that requires typed form responses, several independent signatories, identity verification, or a certified signing record needs a different workflow.
Sign a PDF from start to finish
- Browse for the document. Open the Sign PDF page and click Browse PDF. Choose the PDF you want to sign. The tool reads the file locally and displays its page count, giving you a chance to confirm that you selected the correct document without sending it anywhere.
- Draw the signature. Use your mouse, trackpad, stylus, or finger in the signing box. Adjust the ink color and pen width until the stroke looks natural. If the result is not right, click Clear and draw it again before applying it.
- Select the page and placement. For a multi-page PDF, choose the specific page that should be signed. Then select bottom right, bottom left, top right, top left, or center. The tool translates the selected preset into the corresponding location on the chosen page.
- Apply and download. Click Apply signature. The transparent signature image is embedded into the PDF and scaled automatically so that it fits within the page. Download the finished file from the link provided by the tool.
The downloaded PDF retains the document content with the signature image added. It has no white signature box, no watermark, and no branding from the tool. You can print it, attach it to an email, or save it with your other records.
Choose a practical signature position
The placement controls use fixed positions rather than manual page coordinates. Choose the preset that best matches the intended sign-off area before applying the signature.
| Selected position | Where the signature appears | Typical use |
|---|---|---|
| Bottom right | Near the lower-right corner | A conventional end-of-document sign-off |
| Bottom left | Near the lower-left corner | A left-aligned footer sign-off |
| Center | In the middle of the selected page | A prominent approval or initials area |
| Top right | Near the upper-right corner | A sign-off positioned in the header area |
| Top left | Near the upper-left corner | A left-aligned sign-off in the header area |
Because the available choices are preset areas, check the document layout before applying the signature. The page selector is especially useful when a PDF contains several pages but only one needs approval.
Complete form fields before adding a signature
If the PDF contains blank text boxes, checkboxes, or other form fields, use a PDF form-filling editor to complete those fields first. Save the completed document, open that saved PDF with Sign PDF, and then draw and apply your signature. This separates form completion from the signature-adding step without suggesting that the signing tool can populate the fields itself.
| Task | Handled by Sign PDF? | Appropriate workflow |
|---|---|---|
| Add a handwritten visual signature | Yes | Browse for the PDF, draw the signature, choose a page and position, and download it. |
| Fill text fields or select form checkboxes | No | Complete the fields in a PDF form editor, save the file, and then sign the result. |
| Request another person’s signature | No | Use a dedicated electronic-signature workflow that supports sending and collecting signatures. |
| Create a certified, identity-verified signature | No | Use a dedicated e-signature platform that issues a digital certificate. |
The signature workflow also places one selected visual signature on the chosen page. It does not provide a documented method for adding several different signers to multiple pages in the same document.
Check privacy and the finished file
The privacy behavior is built into the workflow rather than presented as a separate upload setting. The PDF is read, the signature is drawn, and the signature image is embedded entirely within your browser. Nothing is sent to the tool’s server, and no account or email address is required.
- No upload: The selected PDF and signature remain on your device during processing.
- No account: There is no login or registration step.
- No persistent storage: Nothing is stored after you close the tab, so download the finished PDF before closing the page.
- Offline use after loading: The page works offline once it has loaded.
- Clean output: The downloaded PDF contains the original document plus the signature image, with no watermark or site branding.
These properties make the browser workflow appropriate for sensitive contracts, agreements, forms, and letters that require a handwritten mark but not a certified signing service.
Know when a visual signature is appropriate
The signature produced by this tool is an image of a handwritten signature. It is not a certified digital signature or a cryptographic PKI signature. It contains no digital certificate, private key, tamper-evident hash, or audit trail, and it does not verify the signer’s identity or lock the document against later changes.
A drawn signature image can still carry legal weight in many everyday approvals, personal letters, internal sign-offs, and simple agreements. The result depends on your jurisdiction, the document being signed, and whether all parties accept that form of signature. The legal effect comes from the surrounding agreement and applicable law, not from the image file itself.
Use a dedicated e-signature platform when the transaction requires certified signing, identity verification, a certificate, a tamper-evident record, or a formal audit trail. For ordinary visual sign-offs, the local drawing-and-placement workflow provides a direct way to finish the PDF without sending the document to an unfamiliar server.
Review the PDF before sending it
Before distributing the completed document, confirm the following:
- You opened the intended PDF and checked its page count.
- The signature stroke, color, and pen width look clear and natural.
- The correct page and preset position were selected.
- The signature was applied without any remaining form fields that still need attention.
- The signed PDF downloaded successfully and opens as expected.
- The receiving party and applicable agreement accept a visual handwritten signature rather than requiring certified e-signing.
For repeated use, keep the tool page available for quick local signing. Once it has loaded, the complete process stays in the browser, and the downloaded copy is ready to print, email, or archive.