How to Compress an Image for Email
Sending a photo that's "too large to send" is frustrating. Here's how to quickly reduce image size for any email client.
What File Size Should Email Images Be?
The safe target depends on what you're sending:
| Use Case | Target Size | Max Width |
|---|---|---|
| Email attachment (general) | Under 1MB | 2000px |
| Email to mobile recipient | Under 500KB | 1200px |
| Inline newsletter image | Under 200KB | 600px |
| Multiple attachments | Under 5MB total | 1200px each |
Step 1: Resize the Pixel Dimensions First
A photo straight from a modern smartphone is typically 4000–8000 pixels wide and 5–15MB. That's far more than any email needs.
- 1.Go to ImageResizer.org/resize.
- 2.Upload your image.
- 3.Set width to 1200–1600px (keep aspect ratio on).
- 4.Download the resized image.
Step 2: Compress to Reduce File Size Further
After resizing, compress the image for maximum size reduction:
- 1.Go to ImageResizer.org/compress.
- 2.Upload your resized image.
- 3.Set quality to 75–80% for photos. The visual difference is minimal.
- 4.Download and attach to your email.
Tip: Using these two steps together — resize then compress — typically reduces a 10MB phone photo to under 300KB with no visible quality loss.
Try it now — free
Resize then compress. No signup. Instant download.
Best Format for Email Images
- JPG — Best for photos. Smallest file size for photographic content.
- PNG — Best for screenshots, graphics, logos with text. Larger than JPG for photos.
- Avoid WebP for email — Some email clients don't render WebP correctly.
Frequently Asked Questions
What is the maximum image size for email attachments?
Most email providers (Gmail, Outlook, Yahoo) allow up to 25MB total. However, keeping images under 1MB each ensures reliable delivery.
What image size is recommended for email?
For attachments: under 1MB per image. For images inside newsletters: 600px wide, under 200KB each.
Should I compress or resize to reduce email image size?
Both. First resize the pixel dimensions, then compress quality. This combination gives the smallest file size without visible quality loss.
Sources & Further Reading
- → Google web.dev — Compress images: Best practices for image compression including quality vs. file size trade-offs.
- → Litmus — Email Image Size Guide: Email client rendering and recommended image dimensions for newsletters.
- → MDN Web Docs — JPEG format: How JPEG lossy compression works and how quality settings affect output.