What is Sign PDF?
Sign PDF places one PNG or JPEG signature image on one selected PDF page. You control the page, horizontal position, vertical position from the bottom, and image width as a percentage of page width.
This is an image-stamping tool, not a certificate-based digital-signature or e-signature service. It does not verify identity, create a cryptographic signature, request consent, timestamp activity, or produce an audit trail.
Why Use This Tool?
A visible signature image can be convenient when a workflow accepts a manually placed mark and does not require managed electronic-signature evidence.
- Place a prepared PNG or JPEG signature
- Choose a single page
- Adjust position and relative width
- Keep the PDF and image in the browser
How Does This Tool Work?
Upload the PDF and signature image, select a valid page, and adjust the sliders. The image is embedded in the PDF and drawn at the chosen page-relative coordinates while preserving its aspect ratio.
The current controls allow x and y positions from 0% to 90% and width from 5% to 60%. Placement is coordinate-based and has no visual drag preview.
Understanding Your Results
The downloaded PDF contains a visible image. Its presence does not prove who placed it, when it was placed, whether the signer consented, or whether the document changed later.
Why Tracking This Matters
Signature requirements vary by transaction, organization, and jurisdiction. If identity, intent, integrity, certificates, timestamps, or audit evidence matter, use an appropriate signing system and obtain legal guidance.
Benefits of Using Sign PDF
- Supports PNG and JPEG images
- Preserves image aspect ratio
- Page-relative sizing and placement
- Does not upload the document
- Creates a separate stamped copy
- Makes no false certificate claim
How Is the Result Calculated?
Image width equals page width times the selected width ratio. Height is calculated from the image’s original aspect ratio.
Draw height = image height ÷ image width × draw width
- Draw width
- Selected fraction of the PDF page width.
- Image dimensions
- The source PNG or JPEG pixel aspect ratio.
Tips for Better Results
- Use a tightly cropped signature image.
- Prefer transparent PNG when a clean background matters.
- Check the selected page before downloading.
- Keep signature image files secure.
- Use a qualified signing platform when audit evidence is required.
- Review the final PDF at normal zoom.
Conclusion
Sign PDF is appropriate for placing a visible signature image when that is all the workflow requires. It is not identity verification or certificate signing, so use a dedicated e-signature or digital-signature platform for higher-assurance transactions.