Compress Images for Email Attachments — Stay Under Size Limits
Gmail caps total attachments at 25 MB. Outlook at 20 MB. Corporate email servers often cut it to 10 MB. One high-resolution photo from a modern phone can be 8–12 MB on its own. Compress your images before attaching and you'll never hit a bounce-back again.
Email Provider Attachment Limits
These limits apply to the total size of all attachments in a single email, not per file.
| Provider | Limit | Safe Target |
|---|---|---|
| Gmail | 25 MB | < 20 MB |
| Outlook / Hotmail | 20 MB | < 15 MB |
| Yahoo Mail | 25 MB | < 20 MB |
| Apple iCloud Mail | 20 MB | < 15 MB |
| Corporate / Exchange | 10 MB (typical) | < 8 MB |
Target File Size by Use Case
| Use Case | Target Size | Quality Setting |
|---|---|---|
| Inline newsletter header | < 100 KB | 65–70% |
| Product photo | < 200 KB | 70–75% |
| Portfolio screenshot | < 400 KB | 75–80% |
| Document scan | < 500 KB | 80% |
| High-res attachment | < 1 MB | 80–85% |
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How to Compress Images for Email (Step by Step)
- 1
Open FileCrisp Compress Image
No sign-up or installation. Works in Chrome, Safari, Firefox on any device.
- 2
Drop your image
Drag any JPEG, PNG, or WebP onto the tool. JPEG is recommended for email — smallest size, best compatibility.
- 3
Set the quality
For product photos or portfolio images, use 75–80%. For newsletter banners or thumbnails, 65–70% is enough. The preview updates instantly.
- 4
Download
Click Compress and download. The file size is shown before and after so you can confirm it fits your email limit.
- 5
Attach to your email
Attach the compressed file directly in Gmail, Outlook, or Apple Mail. It arrives looking exactly how you compressed it.
Pro Tips
Use JPEG for photos
PNG photos are 3–8× larger than JPEG with no visible quality difference at the email sizes most recipients view. Switch to JPEG for everything except logos and graphics that need transparency.
Resize before compressing
If your image is 4000×3000 pixels but will be displayed at 800×600 in the email, resize it first. Fewer pixels = smaller file, even at the same quality setting.
Check total attachment size
Email limits apply to all attachments combined. If you're attaching 5 images, make sure their total is under your provider's limit, not just individual files.
FAQs
Frequently Asked Questions
Everything you need to know — answered plainly.
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