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Email signature image resizer

Small, sharp logos and headshots for Gmail, Outlook and Apple Mail signatures.

Preset

Drop images here, or paste with Ctrl+V

JPG, PNG, WebP, GIF or HEIC. Several at once is fine.

Settings size, KB limit, format, DPI
1 to 100, empty = automatic

    Your images are processed on this device and never uploaded.

    Crop image

    Drag the box to move it and the corners to resize. With the box focused, arrow keys move it and Shift+arrow keys resize it.

    Example with a real photo

    We ran this tool on the photo below. These are the real results.

    Original4032 × 2929 px · 403.5 KB · JPG
    Result300 × 218 px · 26.5 KB · PNGThis is the actual file the tool made.

    Photo: Unsplash

    What this page does
    Logo300 px wide, PNG, under 50 KB
    Headshot200 × 200 px, under 30 KB
    Banner600 × 100 px, under 50 KB

    Platform sizes change from time to time. These are the commonly recommended sizes as of November 2026; check the platform's help centre if an upload is rejected.

    How to use it

    1. Pick the preset that matches where the image goes.
    2. Drop your image and check the preview.
    3. Download and upload it.

    Getting the email signature image size right

    Large images in a signature make every email heavy, and some mail apps shrink or block them. Signature images are shown small, usually 100 to 300 pixels wide.

    Saving at twice the display size keeps them sharp on high-resolution screens while staying light.

    Questions

    Should the logo be PNG or JPG?

    PNG for logos with flat colours or transparency, JPG for photos. The presets choose for you.

    Is my photo uploaded to a server?

    No. The resizing runs inside your browser with JavaScript, so the image never leaves your device. Once the page has loaded, resizing keeps working even if you go offline.