📧 Email
Best Image Format
Best Image Format
for Email in 2026
Choosing the best image format for email in 2026 comes down to one problem: WebP — the best web format — is still not safe to use in email. Outlook continues to block it. This guide tells you exactly which format to use for every email situation, with a full client compatibility table and file size targets for better deliverability.
📋 Table of Contents
Quick Answer — Best Image Format for Email
The best image format for email depends on the type of image you’re sending. Here’s the short version:
- Photos and hero images: JPG — universal support, good compression, works in every email client
- Logos and images with transparency: PNG — the only format with transparent background support that works everywhere
- Animations: GIF — works everywhere (Outlook desktop shows first frame only)
- WebP: Do not use — Outlook does not support it and it’s still the best image format for email clients to reject
According to Litmus Email Client Market Share data, Outlook desktop still accounts for roughly 9% of all email opens globally — and significantly more in B2B contexts. This is why format choice still matters in 2026.
Email Client Support Table
Before picking the best image format for email, check which formats your recipients’ clients actually support:
| Email Client | JPG | PNG | GIF | WebP | Market Share |
|---|---|---|---|---|---|
| Gmail (web + app) | ✅ | ✅ | ✅ | ✅ | ~30% |
| Apple Mail (macOS + iOS) | ✅ | ✅ | ✅ | ✅ | ~19% |
| Outlook 365 (web) | ✅ | ✅ | ✅ | ✅ | ~10% |
| Outlook desktop (2016–2024) | ✅ | ✅ | ⚠️ First frame | ❌ | ~9% |
| Samsung Email | ✅ | ✅ | ✅ | ✅ | ~8% |
| Yahoo Mail | ✅ | ✅ | ✅ | ⚠️ Partial | ~5% |
| Thunderbird | ✅ | ✅ | ✅ | ⚠️ Partial | ~2% |
Outlook Desktop Is Still the Problem
Outlook desktop accounts for roughly 9% of all email opens globally — but in B2B email, that number is often much higher (20–40%+). If you’re sending marketing emails to business professionals, WebP will be broken for a significant portion of your audience. The best image format for email in those contexts remains JPG or PNG.
JPG — Best Image Format for Email Photos
JPG
Use JPG for: hero images, product photos, lifestyle photography, background images, and any photo-realistic content in your email.
JPG is universally supported in every email client and is the best image format for email photos. It produces small file sizes — typically 50–150KB for a properly optimized 600px-wide email image. The main limitation is no transparency support, but that rarely matters for email photos. The Google WebP documentation confirms JPG remains the universal fallback standard for images where transparency isn’t needed.
JPG is universally supported in every email client and is the best image format for email photos. It produces small file sizes — typically 50–150KB for a properly optimized 600px-wide email image. The main limitation is no transparency support, but that rarely matters for email photos. The Google WebP documentation confirms JPG remains the universal fallback standard for images where transparency isn’t needed.
PNG in Email
PNG
Use PNG for: logos with transparent backgrounds, screenshots, infographics, icons, and any image with sharp text or flat colors.
PNG is the best image format for email logos and graphics. It supports transparency and renders text crisply — important for logos placed on colored email backgrounds. The downside is larger file sizes than JPG for photos. Keep PNG files under 150KB each in email — compress them using our Image Compressor before uploading to your email platform.
PNG is the best image format for email logos and graphics. It supports transparency and renders text crisply — important for logos placed on colored email backgrounds. The downside is larger file sizes than JPG for photos. Keep PNG files under 150KB each in email — compress them using our Image Compressor before uploading to your email platform.
GIF in Email
GIF
Use GIF for: animated elements — animated CTAs, product rotation, loading effects, countdown timers.
GIF is the best image format for email animation, though with a key caveat: Outlook desktop shows only the first frame of an animated GIF. Always design your first frame to work as a standalone static image — it should communicate your core message even without animation. Keep animated GIFs under 500KB to avoid slow loading on mobile connections.
GIF is the best image format for email animation, though with a key caveat: Outlook desktop shows only the first frame of an animated GIF. Always design your first frame to work as a standalone static image — it should communicate your core message even without animation. Keep animated GIFs under 500KB to avoid slow loading on mobile connections.
WebP in Email — Why to Avoid It
WebP
Do not use WebP in email — even in 2026. Despite 97%+ browser support for websites, Outlook desktop still renders WebP images as broken. Since you can’t control which email client your subscribers use, WebP is too risky for mass email — it is simply not the best image format for email at this time.
The exception: if your analytics confirm your audience is 100% on Gmail, Apple Mail, or webmail — but this is extremely rare in practice. For web landing pages linked from email, WebP is absolutely the right choice. Just not inside the email itself. The Can I Email compatibility database documents WebP’s ongoing lack of support in Outlook.
The exception: if your analytics confirm your audience is 100% on Gmail, Apple Mail, or webmail — but this is extremely rare in practice. For web landing pages linked from email, WebP is absolutely the right choice. Just not inside the email itself. The Can I Email compatibility database documents WebP’s ongoing lack of support in Outlook.
File Size & Deliverability
Large images hurt email deliverability regardless of which best image format for email you choose. Spam filters flag emails over certain size thresholds, and large images increase bounce rates on slow mobile connections. Here are the targets to hit:
| Image Type | Max Width | Target File Size | Format |
|---|---|---|---|
| Hero / banner image | 1200px (displays at 600px) | Under 150KB | JPG |
| Product image | 600px | Under 80KB | JPG |
| Logo | 300px | Under 20KB | PNG |
| Icon / badge | 100px | Under 10KB | PNG |
| Animated GIF | 600px | Under 500KB | GIF |
| Total email weight | — | Under 500KB ideally | All images combined |
Best Image Format for Email — Checklist & Best Practices
✅ Email Image Checklist
✅Choose the best image format for email by content type: JPG for photos, PNG for logos/graphics, GIF for animation — never WebP
✅Use 2× resolution for retina: If image displays at 600px, export at 1200px wide and set HTML width=”600″ — sharp on retina screens
✅Always include alt text: Many users have images disabled by default — alt text is all they see until they enable images
✅Host images externally: Always link to images hosted on a server — never embed base64 images in email (bloats size enormously)
✅Use absolute URLs: Email image src must be a full URL (https://…) not a relative path
✅Compress before upload: Run all images through a compressor before adding to your ESP — especially JPGs
✅Test with images off: Send test emails and view them with images disabled — your email must still make sense
✅Don’t use images for text: Important text (offers, CTAs, legal) must be HTML text, not embedded in images
✅GIF first frame rule: First frame of any GIF must work as a standalone static image for Outlook users
🗜️ Compress Email Images Before Sending
Run your JPG and PNG email images through our free compressor to hit the file size targets above — no sign-up, instant download.
Frequently Asked Questions
The best image format for email is JPG for photos in 2026. Use PNG for logos and transparent images. Avoid WebP in emails — Outlook desktop still doesn’t support it and accounts for a significant portion of business email opens. GIF is fine for animation as long as the first frame works on its own for Outlook users.
No — WebP is not safe to use in emails in 2026. Microsoft Outlook desktop (still widely used in business environments) does not support WebP. Gmail and Apple Mail support it, but since you can’t control which client your subscribers use, stick with JPG for photos and PNG for logos/graphics. JPG remains the best image format for email photos across all clients.
Email content is typically 600px wide. Export hero images at 1200px (2× for retina) and set width=”600″ in HTML. Target file sizes: hero images under 150KB, product images under 80KB, logos under 20KB. Total email size including all images should ideally stay under 500KB for best deliverability.
Yes — animated GIFs are the best image format for email animation and work in all major email clients except Outlook 2007–2024 desktop, which shows only the first frame. Always design the first frame to stand alone as a complete static image. Keep GIF files under 500KB to avoid loading issues on mobile connections.
Common causes: the image URL is not absolute (must start with https://), the image server has access restrictions, the file format isn’t supported by the recipient’s email client (e.g. WebP in Outlook — which is why JPG is the best image format for email), or the image was too large and timed out. Always host images on a reliable public server and use absolute URLs.
