Signature Image Resizer
Create a consistently sized email signature logo, portrait, banner, or handwritten signature with precise dimensions and clean background handling.
Build a clean, dependable email signature asset
Useful signature presets
Start with common logo, retina logo, headshot, and horizontal banner canvas sizes.
Fit, fill, or stretch
Preserve the whole image, crop it to fill the canvas, or use exact stretching only when appropriate.
Transparency support
Keep transparent logo edges in PNG or flatten the image onto a selected color for JPG.
Email signature image choices
| Setting | Result | Best use |
|---|---|---|
| 300 x 100 | Standard logo | Compact display in many email clients |
| 600 x 200 | Retina logo shown at half size | Sharper text and marks on high-density screens |
| 120 x 120 | Headshot or avatar | Square portrait beside contact details |
| 500 x 150 | Horizontal banner | Campaign, award, or company strip |
How it works
- 1
Upload a signature image
Choose a logo, portrait, handwritten signature, or promotional strip.
- 2
Set size and fit
Select a preset or exact dimensions, then choose fit, crop, or stretch.
- 3
Export PNG or JPG
Keep transparency when needed and download the finished signature asset.
Email signature image size best practices
Email signature graphics should be readable without dominating the message. Use a compact displayed size, and consider generating a two-times pixel version for high-density screens while setting the visual width in your email signature editor.
PNG is a strong choice for logos with transparency or sharp text. JPG suits rectangular photos without transparency. Avoid oversized files, remote tracking images you do not control, and critical contact information embedded only inside the image.
Frequently asked questions
What size should an email signature logo be?
About 300 x 100 pixels is a practical starting canvas, but the ideal size depends on the logo proportions and signature layout.
Should I use PNG or JPG?
Use PNG for transparent logos and sharp graphics. Use JPG for rectangular photos when transparency is unnecessary.
What is a retina signature image?
It uses roughly twice the pixel dimensions and is displayed at half size for greater sharpness on high-density screens.
Does this tool upload my company logo?
No. The image is processed locally in your browser.
Signature Image Resizer last reviewed: Aug 2, 2026.