Compress Images for Email — Under Attachment Limits
Email providers impose strict attachment size limits — Gmail allows 25MB, Outlook 20MB, and many corporate servers limit to 10MB. Compressing images before attaching them ensures delivery without bounced emails. This tool reduces image file size in your browser.
Drop an image here or click to browse
JPEG, PNG, WebP, etc.
All processing happens in your browser. No files are uploaded.
Tips & best practices
- Gmail: 25MB total attachment limit. Compress large photos to 500KB-1MB each for multiple attachments
- Outlook: 20MB limit. Corporate Outlook servers often restrict to 10MB — compress to under 500KB per image
- JPEG quality at 70-80% typically produces images that look identical to the original but are 50-70% smaller
- For screenshots and documents, PNG compression can often halve the file size without any quality loss
- Consider resizing images to 1920px width before compressing — most email clients don't display larger
Frequently Asked Questions
What is the maximum email attachment size?
Gmail: 25MB total, Outlook: 20MB, Yahoo: 25MB, most corporate servers: 10-15MB. These limits apply to the total of all attachments combined, not per file.
How much can I compress photos for email?
Most phone photos (3-8MB each) can be compressed to 200-500KB with no visible quality loss at email viewing sizes. That's a 90% size reduction, letting you attach 20+ photos in a single email.
Will compressed images look bad in email?
No — email clients display images at screen resolution, not print resolution. A photo compressed from 5MB to 500KB looks identical when viewed in Gmail, Outlook, or Apple Mail.
Should I resize or compress images for email?
Both. First resize to 1920px maximum width (emails rarely display wider), then compress quality to 70-80%. This two-step approach gives the smallest file size with the best visual quality.
All processing happens in your browser. No files are uploaded to any server.