Right-Size the Image in Your Email Signature

No platform enforces a signature size — but inboxes punish oversized ones. The preset below keeps yours sharp and light.

Last updated: July 2026

Drop your images here or click to select

Supports JPG, PNG, WebP and AVIF

There is no official standard for email-signature images — Gmail and Outlook will happily embed whatever you paste, and that's exactly the problem: a 3000-pixel logo renders enormous in some clients, pushes messages toward Gmail's clipping threshold, and rides along on every single email you send. The working convention among email designers is small and wide: banner-style signatures around 600×200 pixels, standalone logos 150–300 px wide, headshots 100–150 px square. The resizer above is pre-set to 600×200 for a banner; change the numbers for a logo or headshot.

How to resize a logo or photo for your email signature

  1. 1

    Drop your image

    Drop it into the box above — it's resized on your device, so company assets and headshots stay local.

  2. 2

    Pick the size for your element

    600×200 (pre-set) for a banner, ~250 px wide for a logo, ~120 px square for a headshot. Enable the aspect-ratio lock for logos so nothing stretches.

  3. 3

    Choose the right format

    PNG for logos (keeps transparency over any background), JPG for photos.

  4. 4

    Download and insert

    Add it via your mail client's signature settings — insert the image file itself rather than dragging it into the compose window.

Pro tip: Export at exactly the pixel size you want displayed. Most email clients render images at their native dimensions, so a "retina" double-size logo shows up double-size in Outlook instead of sharper. If crispness on high-DPI screens matters, test the doubled version in your own client before rolling it out to a team.

Troubleshooting: If your signature image arrives blurry, it was probably inserted oversized and scaled down in the compose window — resize to the final display size first, then insert without dragging the corners. If recipients see a broken image icon instead, the image was linked from a server rather than embedded; insert the file itself so it travels with the email.

Finishing the signature? Compress JPG for Email keeps any attachments light, Crop Photo for Avatar squares up a headshot before resizing, and the main Resize Image tool handles any custom dimensions.

Frequently asked questions

What size should an email signature image be?

There's no enforced standard, but the widely used convention is 600×200 pixels for banner-style signatures, 150–300 px wide for logos, and 100–150 px square for headshots. Small native sizes render predictably across Gmail, Outlook, and Apple Mail.

Why does my signature image look huge in Outlook?

Outlook tends to render embedded images at their native pixel dimensions, ignoring display scaling other clients apply. An image saved at 2000 px wide shows up 2000 px wide. Resize the file itself to the intended display size before inserting it.

Should my signature image be PNG or JPG?

PNG for logos and graphics: it keeps sharp edges and transparency, so the logo sits cleanly on any background color. JPG for photographic headshots, where it produces smaller files with no visible difference at signature sizes.

Is my logo uploaded when I resize it here?

No. The resize happens entirely inside your browser on your own device — company logos and headshots are never uploaded, stored, or logged. They go straight from your disk to the resizer to your downloads folder.

Looking for the full-featured version? Open the main Resize Image tool.

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