Email clients and servers often limit attachment sizes. Compress images to under 100–200 KB locally in your browser—private, fast, and free. Perfect for email attachments and signatures.
Why email limits matter
Most email providers cap attachment sizes at 10–25 MB total, but smaller images (100–200 KB each) load faster, don't bounce, and look great in both desktop and mobile email clients. Email signatures should stay under 50–100 KB to avoid rendering issues.
Quick start
- Open the Under 100 KB tool or Under 200 KB tool
- Drop your image into the compressor
- The tool automatically targets your chosen size limit
- Download the compressed image
- Attach to your email or add to your signature
Compress your email images now:
Target sizes
Email signatures: under 100 KB
Signatures display in every email you send. Keep images (headshots, logos) under 50–100 KB and around 200–400 px wide. This prevents slow loading and rendering issues across email clients.
Inline images: under 200 KB
For photos, charts, or graphics inside email bodies, target 200 KB and 800–1200 px wide. They'll look sharp on all devices without triggering attachment warnings.
Attachments: under 200 KB per file
If you're sending multiple images, keep each one under 200 KB to stay well below most email limits and ensure fast delivery.
Best settings
- Format: Use JPEG for photos; PNG for logos/signatures that need transparency
- Quality: Start at 78–85% for JPEG; reduce 2–3% at a time until you hit your target
- Width: 800–1200 px for inline images; 200–400 px for signatures
- Resize first: Scale down large images before compressing for better results
Troubleshooting
Image looks blurry in email: Try keeping width around 1000 px and reducing quality gradually (2% at a time). Test in your email client before sending.
Signature image not displaying: Some email clients block images by default. Keep signatures under 50–100 KB and use common formats (JPEG, PNG).
Attachment bounced back: If your total email size exceeds 25 MB, compress all images or send in multiple emails.
FAQ
What size is best for email attachments?
100–200 KB per image is ideal. Email signatures should be even smaller, around 50–100 KB.
Will my images look blurry?
Keep width around 1000 px and reduce quality in 2–3% steps. Test on your email client to find the sweet spot between size and clarity.
PNG or JPEG for email?
JPEG for photos; PNG for logos or signatures with transparency. JPEG is usually smaller for photos.
Start compressing your email images: