Compress image for Newsletter (Generic Email Template)
Most newsletter platforms render images at 600 px max. 400 KB retina JPEG is the safe default.
Your images stay on your device. Nothing is uploaded.
Every major newsletter platform (Mailchimp, ConvertKit, ActiveCampaign, Beehiiv, Substack, Kit) renders images at 600 px max width in default templates. That means the sensible upload size is 1200 px for retina rendering.
This preset produces a 1200 px JPEG at quality 82 — safe for any modern newsletter platform.
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Frequently asked questions
- What's the attachment size limit for Newsletter (generic)?
- Newsletter (generic) 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 Newsletter (generic)?
- 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 Newsletter (generic) compress images automatically?
- Newsletter (generic) 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 Newsletter (generic)?
- 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 Newsletter (generic).
Land under the target size in seconds. Nothing uploaded — runs entirely in your browser.
Start compressing