How to Reduce Image File Size for Email (2026)

Most email providers cap attachments at 20–25 MB. A handful of modern phone photos blows past that immediately. Here's the no-nonsense way to fit any image batch under the limit without uploading your files to a sketchy site.

The provider limits

• Gmail: 25 MB total per email (attachments combined). Beyond that, files convert to Google Drive links.
• Outlook.com / Microsoft 365: 20 MB total.
• Apple iCloud Mail: 20 MB.
• Yahoo Mail: 25 MB.

Note "total per email": that's the sum of all attachments and the message body. Practical headroom is about 90% of the cap.

The size of a typical photo

A batch of 10 modern phone photos easily exceeds Gmail's 25 MB cap.

The two-step solution

Step 1: Convert / re-encode if needed

If you have HEIC files (any iPhone photo), convert to JPEG first. Many email providers display HEIC as a broken icon. Drop the files into HEIC to JPG. Output goes to JPEG q90 by default, which is visually identical to the source.

Step 2: Compress to target size

Open Image Compressor and drop the JPEGs. Pick a quality level:

• Quality 80: ~50% smaller than the source. Perfect for most email use, no visible quality loss at normal viewing.
• Quality 70: ~65% smaller. Minor compression artefacts visible only on close inspection.
• Quality 60: ~75% smaller. Use only if 70 doesn't fit under the cap.

Everything runs in your browser, your photos are never uploaded anywhere.

Real numbers

Batch of 10 iPhone JPEGs (original total: 28 MB):

Quality 90 is usually plenty. If you also need to resize (e.g. 4000×3000 → 1920×1440 is fine for screen-only viewing), savings stack.

When you should NOT compress

• Sending originals to a designer / editor. They need the full-resolution source.
• Archival or insurance documentation. Keep originals; send compressed copies if you must.
• Print-ready files. Print at q60 will reveal compression banding.

For these cases, share a cloud-storage link (Google Drive, Dropbox, iCloud) instead of compressing.

Why use OmegaPix specifically

Three reasons over the typical online compressor:

1. No uploads. Your photos stay on your device. For family photos, IDs, or anything personal, this is the only safe option.
2. No account required. No signup wall, no email-for-access trick.
3. Batch processing. Drop 50 photos, get a ZIP back.

Recommendation

For a typical email of ~10 photos: convert HEIC to JPG if needed, then run Image Compressor at quality 85. You'll be safely under any provider's limit with no visible quality loss.