How to Add a Signature to a PDF

Before You Begin

• Keep an untouched copy of the original PDF.
• Confirm that the recipient accepts an inserted signature image.
• Use a private device for sensitive documents.
• Choose a transparent PNG to avoid a visible white box.

Add the Signature

1. Create or select your signature PNG.
2. Open a copy of the PDF in a trusted editor.
3. Choose the editor’s image, fill, annotate, or sign feature.
4. Select the PNG and place it on the intended signature line.
5. Resize from a corner to preserve its proportions.
6. Save as a new PDF and reopen it to confirm the image remains visible.

Avoid Blurry or Misplaced Signatures

Do not stretch the image wider from one side. Start with a reasonably large transparent PNG and reduce its size inside the document. Zoom in after placement to check edges and alignment.

Understand the Limitation

Placing an image into a PDF does not by itself prove identity or prevent later edits. If the transaction requires an audit trail, certificate, identity check, or tamper evidence, use a service designed for that process.