Free tool
Resize your logo and photo for an email signature
Drop an image, pick what it is for, and download a version sized for email: twice the display size so it stays sharp, light enough to load fast, in a format Outlook displays. Your image never leaves your browser.
Processed in your browser. Nothing is uploaded.
Recommended sizes at a glance
| Element | Display size | Export (2x) | Max weight | Format |
|---|---|---|---|---|
| Logo | 200 px wide (5.3 cm) | 400 px wide | 50 KB | PNG |
| Photo | 100 × 100 px (2.6 cm) | 200 × 200 px | 40 KB | JPG |
| Banner | 600 × 150 px (15.9 cm) | 1200 × 300 px | 100 KB | JPG |
| Social icon | 24 × 24 px (0.6 cm) | 48 × 48 px | 5 KB | PNG |
Why export at 2x
Most laptops and phones have high-resolution screens that draw two pixels for every pixel of your layout. A logo exported at exactly its display size looks soft on them. Export it twice as large, then tell the email client its display size with width and height in the HTML: it stays sharp everywhere.
Keep each image under 100 KB
Heavy images slow down every email you send, eat your recipients' mobile data and can be attached instead of displayed. A logo rarely needs more than 50 KB and a banner more than 100 KB. The tool compresses until it fits.
PNG, JPG, GIF, SVG or WebP: what works where
PNG for logos and icons: sharp edges and transparency. JPG for photos and banners: much lighter for the same quality. GIF only for simple animations: older versions of Outlook show only the first frame. Avoid SVG and WebP in signatures: classic Outlook for Windows shows neither, and Gmail blocks SVG.
Transparent logos and dark mode
In dark mode, email clients darken the background but keep your image as is. A black logo on a transparent background then disappears. Add a subtle light outline, use a light version of the logo, or give it a white background with rounded corners.
Sizes by email client
Classic Outlook for Windows scales images with the Windows display setting when width and height are missing, which makes them huge or tiny: always set both. Gmail and Apple Mail respect the HTML size and use the extra pixels of a 2x image on sharp screens.
Frequently asked questions
What size should a logo be for an email signature?
Display it at about 200 px wide and export it at 400 px, under 50 KB, as a PNG.
What pixel size should an email signature be?
Keep the whole signature within 600 px wide and about 150 to 200 px tall, so it fits any screen without scrolling.
Why is my email signature image blurry?
It was exported at its display size, or scaled up by the email client. Export at twice the display size and set width and height in the HTML.
Why is my email signature image so big in Outlook?
Classic Outlook uses the real size of the file when width and height are missing. Set both attributes, as EmailSign templates do.
Should I use PNG or JPG?
PNG for logos and icons, JPG for photos and banners.
Liked this tool? It is a small part of EmailSign.
EmailSign resizes, compresses and hosts your images automatically, then builds a signature that stays intact in Outlook, Gmail and Apple Mail. Free, 16 templates, ready in two minutes.
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