How to Reduce Photo File Size for Email (Under 10 MB)

Most email providers cap attachments at 25 MB (Gmail) or 10 MB (Outlook). A single iPhone photo can be 5-8 MB as JPEG, making it impossible to attach more than 2-3 photos. Here’s how to fix that.

Why Photos Are Too Large for Email

A typical 12 MP iPhone photo:

Format	Quality	File Size	Emailable?
HEIC	Original	~2.5 MB	Yes
JPEG	100%	~8 MB	1-2 photos max
JPEG	92%	~4 MB	Yes
JPEG	85%	~2.5 MB	Yes, recommended
JPEG	70%	~1.5 MB	Yes, ideal

Method 1: Reduce JPEG Quality

Convert or re-encode at 80-85% quality:

1. Go to heicgo.com
2. Drag in your photos (HEIC or JPEG)
3. Set quality to 80%
4. Convert and download

At 80% quality, a 4 MB photo becomes ~1.5 MB — you can attach 6-7 photos per email with barely perceptible quality difference.

Method 2: Resize Before Sending

Most email clients display photos at 600-800 px wide. A 4032 px photo is overkill:

1. Convert with heicgo, set “Max Width” to 1920 px
2. File size drops 60-80% even at high quality
3. Still looks perfect on any screen

Method 3: ZIP Multiple Photos

Instead of attaching 10 individual files, ZIP them:

1. Batch convert on heicgo
2. Click “Download All (ZIP)”
3. Attach the single ZIP file

Many email clients have per-file size limits but ZIP counts as one file.

Method 4: Use Cloud Sharing Links

For large batches, skip email entirely:

• iCloud Photo Link: Select photos → Share → Copy iCloud Link
• Google Drive: Upload → Get link → Paste in email
• WeTransfer: Free up to 2 GB, link expires in 7 days

This is better than email for 20+ photos.

Method 5: Convert to HEIC

Ironically, converting JPEG back to HEIC can shrink files:

1. HEIC achieves better compression than JPEG
2. Converting JPEG → HEIC can reduce size 30-40%
3. Only works if recipients use Apple devices

The Recommended Workflow

Multiple photos to email
        │
        ▼
Batch convert (heicgo, 80% quality, 1920px)
        │
        ▼
Download ZIP
        │
        ▼
Attach single ZIP file to email

This typically shrinks a 40 MB set of photos to a 3-5 MB ZIP, well under any attachment limit.

Further Reading

• Compress JPEG Without Losing Quality — compression techniques
• Batch Convert HEIC to JPG — process multiple files at once
• How to Convert HEIC to JPG — convert before compressing