Compress image for Email Signature (Under 50 KB)
Signatures render at ~ 100 px in most email clients. 50 KB is generous.
Your images stay on your device. Nothing is uploaded.
Email signatures render at 100 px on most clients, 200 px on retina. Anything above 50 KB is wasted bytes — but many signature templates ship 500 KB images that inflate every outbound message.
This preset produces a 400 px JPEG at quality 78 — retina-safe for signatures, well under 50 KB.
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Frequently asked questions
- What's the attachment size limit for Email signature?
- Email signature caps attachments at the size the preset on this page targets. Anything above the cap either gets rejected or gets converted to a link-share fallback (like Gmail's Drive attachment).
- Why compress before attaching to Email signature?
- Recipients may be on slow mobile connections, and their servers may enforce lower caps than yours. Compressing before send maximises deliverability and speeds up download for recipients on mobile.
- Does Email signature compress images automatically?
- Email signature does not re-compress attachments the same way social media platforms do — what you send is what the recipient receives. So the size at send equals the size at receive.
- What format is best for Email signature?
- JPEG is the safest universal choice for email attachments — every email client can preview it inline. WebP support varies (Outlook desktop can't preview WebP), so JPEG remains the default.
- Is my image uploaded to a server?
- No. Compression runs entirely in your browser. Only when you attach the compressed result to your email does it leave your device.
Compress an image for Email signature.
Land under the target size in seconds. Nothing uploaded — runs entirely in your browser.
Start compressing