Resize an Image for an Email Signature
A crisp, tiny signature logo or photo that loads instantly: resize and compress so it never slows an email down.
An email signature image should be small: about 300–400px wide (100–150px tall for a logo) and well under 100KB, so it loads instantly and doesn't bloat every email. Resize to the display width and compress hard. Host the image and link to it rather than embedding a huge file. Our tools do it in your browser.
| Logo width | ~300–400 px (100–150 px tall) |
|---|---|
| Headshot | ~100–150 px square |
| File size | Well under 100 KB |
| Format | PNG (logo) or JPG (photo) |
3 tools for this
Free, private and in your browser. No sign-up, no watermark.
Image Resizer
Resize any image to exact pixel dimensions with an optional aspect-ratio lock and ready-made social presets, free and fully in your browser.
Image Compressor
Shrink JPG, PNG and WebP images without a visible quality drop. Set the quality yourself, or compress to an exact target size like 100 KB. Free, entirely in your browser.
PNG to JPG
Convert PNG images to JPG in your browser: pick a background color for transparent areas, set the quality, and download a much smaller file.
How to do it
- 1
Resize small
Set the width to ~300–400px for a logo, or ~100–150px for a headshot, in Image Resizer.
- 2
Compress hard
Signatures repeat on every email, compress well under 100KB so they never slow things down.
- 3
Use the right format
PNG keeps a logo crisp with transparency. JPG is smaller for a photo.
- Host the image on your site or a service and link to it, embedding large images bloats every message.
- Keep it small. Oversized signature images are a common reason emails feel slow or get flagged.
- A transparent PNG logo sits cleanly on both light and dark email themes.
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