Signature PNG Maker: Create a Digital Signature Image

A signature PNG is a small image of your handwritten signature on a transparent background. Drop it into a contract, paste it into an email signature, overlay it on a PDF — it looks like you signed by hand. The transparent background means no white rectangle around your name, regardless of what sits behind it.

Two paths to get one: photograph your real signature and remove the background, or draw a new one digitally. This guide covers both methods, compares the tools, and walks through making your signature transparent with Pixotter.

What Is a Signature PNG and Why You Need One

A signature PNG is a small image (typically 300-600px wide) saved in PNG format with an alpha channel. The alpha channel makes the background invisible, so only your signature ink is visible when placed on a document.

Common use cases:

• Email signatures. Embed a handwritten signature below your sign-off in Gmail, Outlook, or Apple Mail. For sizing guidance, see email signature image size best practices.
• PDF contracts and agreements. Insert your signature without printing, signing by hand, and scanning. Most PDF editors accept PNG overlays.
• Google Docs and Word. Drop the image inline to sign letters, invoices, and proposals.
• Branded templates. Add a signature to newsletters, blog posts, or company announcements for authenticity.

Why PNG specifically? JPEG does not support transparency — your signature would sit inside a white box. PNG's alpha channel lets the background show through cleanly. For more on creating PNG images, see our PNG maker guide.

How to Create a Signature PNG from a Photo

Step 1: Write and Photograph

Sign your name on white paper using a dark felt-tip pen (black or dark blue). Photograph in bright, even lighting — overhead daylight works best. Avoid shadows crossing the signature.

Step 2: Crop and Remove the Background

Crop tightly to just the signature with a small margin on each side. Then make the white paper transparent using one of these methods:

Pixotter (browser-based, free). Open Pixotter's converter, drop your cropped image, and export as PNG. See the Pixotter workflow section below for background removal details.

GIMP 2.10.38 (GPL-3.0, free). Open your image, go to Colors > Color to Alpha, select white (#ffffff), and adjust the threshold until the paper disappears but ink stays solid. Export as PNG. See how to make a PNG transparent for full steps.

ImageMagick 7.1 (Apache 2.0, free). From the command line:

magick signature-photo.jpg -fuzz 20% -transparent white signature.png

The -fuzz 20% value controls how aggressively off-white pixels are removed. Start at 15% and increase if paper texture remains.

Step 3: Verify

Open the result on a dark background to confirm full transparency. If white remnants remain around the strokes, increase the fuzz/threshold and reprocess. Resize to 300-400px wide for email signatures or 400-600px wide for documents.

Drawing a Digital Signature as PNG

If you prefer to draw your signature digitally, several tools handle this:

Best free desktop option: Krita 5.2 or GIMP 2.10.38. Both support pressure-sensitive tablets for natural-looking strokes. Create a new image with a transparent background, draw your signature in black, and export as PNG.

Best quick browser option: CreateMySignature.com lets you draw with a mouse or finger and download a transparent PNG. No account required.

For typed signatures: If you want a script-font signature, see our text PNG maker guide.

Making Your Signature Transparent with Pixotter

Pixotter processes images entirely in your browser using WebAssembly. Your signature never leaves your device — important when handling personal signatures.

1. Open Pixotter's converter and select PNG as the output format.
2. Drop your signature image onto the page (JPG, HEIC, WebP, or any supported format).
3. Convert to PNG. If your source was JPEG, the output is now lossless PNG.
4. Remove the background. Use Pixotter's background changer to replace the solid background with transparency.
5. Compress if needed. Signature PNGs should stay under 30KB for email use. Use Pixotter's PNG compressor to reduce file size without visible quality loss.
6. Download. Your transparent signature PNG is ready.

The entire process takes under 30 seconds. No account, no upload, no watermark.

Adding Signature PNGs to Documents, Emails, and PDFs

Here is how to insert your transparent signature PNG across common platforms.

Gmail and Outlook

Gmail: Go to Settings > Signature, click the Insert Image icon (mountain icon), upload your PNG, and resize to roughly 200-300px wide. The signature appears on every email you send.

Outlook (Desktop, v2404+): Go to File > Options > Mail > Signatures, click New, then click the image icon and select your PNG. Outlook respects transparency in HTML-mode emails.

Google Docs, Word, and PDFs

Google Docs / Word: Place your cursor where the signature should go, then Insert > Image > Upload from computer. Set wrapping to In front of text and position over a signature line.

Adobe Acrobat Pro 2024: Tools > Fill & Sign > Sign yourself > Add Signature > Image. Upload your PNG and place it on the document.

macOS Preview 14: Click Markup, then drag your signature PNG directly onto the PDF page.

To convert a signature image into a standalone PDF, see our convert image to PDF guide.

HTML Email Templates

Embed the signature as an inline image with explicit dimensions:

<img src="signature.png" alt="Signature of [Your Name]" width="250" height="80" style="display:block;">

Host the image on a CDN or embed as base64. See our image to base64 guide.

FAQ

What size should a signature PNG be?

For email signatures: 250-400px wide, 80-150px tall. For document insertion: 400-600px wide at 150 DPI. Keep the file under 30KB for email and under 100KB for documents.

Can I use a JPEG signature instead of PNG?

You can, but the white background will be visible. JPEG does not support transparency. If you place a JPEG signature on a colored or textured background, you get a white rectangle around your name. PNG avoids this entirely.

Is it legally valid to use a signature PNG on contracts?

In most jurisdictions (including the US under the ESIGN Act of 2000 and the EU under eIDAS), an electronic signature is legally binding if both parties consent to electronic signing. A signature PNG qualifies. For high-value transactions, consider a dedicated e-signature service (DocuSign, HelloSign) that provides audit trails.

How do I make the background fully transparent?

Re-process with a higher fuzz or threshold value. In ImageMagick 7.1, increase -fuzz from 15% to 25%. In GIMP 2.10.38, increase the Color to Alpha transparency threshold. Verify by viewing on a dark background.

Can I convert my signature PNG to PDF?

Yes. If you need your signature as a standalone PDF (some legal workflows require this), see our convert image to PDF guide. Place the PNG on a standard page size and export.

Does Pixotter store my signature image?

No. Pixotter processes everything in your browser using WebAssembly. Your image never leaves your device — nothing is uploaded to a server. This is particularly important for signature images, which are sensitive personal data.