Is my image uploaded to a server?

No. Resizing and compression happen entirely in your browser using the HTML5 Canvas API. The image is never sent anywhere.

What width should I use for an email signature image?

Most email clients render signature logos and headshots well between 150 and 300 pixels wide. A logo mark works fine near 150px, while a headshot or wider logo usually looks better around 250-300px.

Why does the file size matter for a signature image?

Signature images are attached to or embedded in every outgoing email. A large file adds weight to every message, can slow sending on a poor connection, and some mail servers strip or downgrade inline images above a size threshold.

Should I use JPEG or PNG?

Use JPEG for photos and headshots, since it compresses photographic detail to a much smaller file size. Use PNG for logos with flat colors or a transparent background, since PNG keeps sharp edges and transparency that JPEG cannot.

Will the resized image look stretched or distorted?

No. The tool always scales height in proportion to the width you choose, so the original aspect ratio is preserved.

Does this tool crop my image?

No. It only resizes the full image down to the target width and compresses it. If you need to crop first, use a cropping tool before resizing here.

Email Signature Image Resizer

Resize a logo or headshot to a small, email-safe pixel width and download it ready to paste into your email signature.

Upload Image

Logo or headshot for your email signature

Click to upload or drag and drop PNG, JPEG, or WebP

Resize Settings

Target Width (px)

Height scales automatically to keep the image proportional.

Output Format

Max File Size (KB)

JPEG quality is lowered automatically to fit this limit.

Upload an image to preview the resized version

Done!

Summary

This tool resizes a logo or headshot photo down to the small pixel width that email clients expect in a signature block, then compresses it to keep the file size low so the signature does not bloat every outgoing message or get stripped by a mail server's attachment limit. Pick a width between 150 and 300 pixels, or enter a custom value, and the height scales automatically to keep the image from looking stretched. Everything runs in your browser with the Canvas API; the image is never uploaded anywhere.

How it works

Click the upload zone or drag a logo or headshot image onto it.
Pick a width preset (150, 200, or 300px) or enter a custom width.
Choose JPEG or PNG output and set a target maximum file size in KB.
Preview the resized image and its estimated file size.
Click "Download Resized Image" to save the file to your device.

Use cases

Shrink a company logo so it does not dominate an email signature block.
Resize a headshot photo to the width most email clients render signature images at.
Cap a signature image under a mail server's attachment or inline-image size limit.
Convert a large PNG export from a design tool into a small JPEG for a signature.
Standardize logo width across a team so every signature looks consistent.
Re-resize an old signature image that displays too large in some email clients.

Frequently Asked Questions

Last updated: 2026-09-09 · Reviewed by Nham Vu