📧 Resize Image for Email Attachment in Minutes

Avoid undeliverable messages and sluggish inboxes. Here’s exactly how to resize images for email attachments while keeping your visuals sharp.

Source: Unsplash

📚 Table of Contents

• 🎯 Ideal dimensions & file sizes
• 🛠️ Quick resizing workflow
• 💡 Compression & sending tips
• 🚀 Next steps

🎯 Ideal dimensions & file sizes

• Keep email images within 600–900 px width to match most email body containers and maintain readability across devices (Mailmodo).
• Aim for <1 MB per image (preferably under 500 KB) so attachments stay below the typical 25 MB total limit (WikiHow).
• For hero banners, 600 × 400 px or 750 × 500 px works well; thumbnails and logos can be 100–300 px square (Simple Image Resizer).

🛠️ Quick resizing workflow

1. Upload to an online resizer like SimpleImageResizer.com or Imageresiz.com to shrink width/height and file size simultaneously (Simple Image Resizer; ImageResiz).
2. Set target width (e.g., 800 px) or percentage reduction and lock aspect ratio.
3. Download the resized version, then optionally run it through a lightweight compressor (TinyPNG, Squoosh) for extra savings.

💡 Compression & sending tips

• In Outlook or Gmail, enable built-in Compress Pictures or insert via cloud links when files are large (WikiHow).
• Use JPEG for photography at 70–80% quality; PNG or WebP for graphics with transparency.
• If your campaign relies on inline images, host the resized file on your ESP/CDN and reference it in HTML so inboxes load it faster.

🚀 Next steps

Once your assets are email-ready, keep a folder of preset sizes (600 px hero, 300 px icons) for future campaigns. Need to expand these images later for web or print? Head to ImageStretcher.com to add background space without blowing up your email-friendly files.