Best Image Format for Email and Newsletters in 2026
- JPG is the safest choice for photos in email — universal support
- PNG is best for logos and graphics with transparency or text
- GIF is the only option for animation in email
- AVIF and WebP are not supported in Outlook, Apple Mail, or most email clients
Table of Contents
The best image format for email in 2026 is JPG for photographs, PNG for logos and graphics, and GIF for animation. AVIF and WebP — the clear winners for web pages — are not supported by Outlook, Apple Mail, or Gmail in most contexts. Email is one place where you stick with the classics. Here is exactly which format to use and why, platform by platform.
Why AVIF and WebP Are Not Good Choices for Email
Email clients do not function like web browsers. They use their own rendering engines to display HTML email, and most have not added support for AVIF or WebP. The main clients and their format support:
| Email Client | AVIF Support | WebP Support | JPG/PNG/GIF |
|---|---|---|---|
| Outlook (desktop) | No | No | Yes |
| Gmail (webmail) | No | Limited | Yes |
| Apple Mail (iOS/macOS) | Limited | Yes | Yes |
| Thunderbird | Partial | Yes | Yes |
| Samsung Email | No | No | Yes |
If you send an AVIF image in an email to an Outlook user, they will see a broken image. There is no graceful fallback mechanism in email like the HTML <picture> element on web. JPG is the safe choice.
JPG vs PNG for Email — When to Use Each
Use JPG when:
- The image is a photograph (product photo, team photo, lifestyle image)
- File size matters — large emails trigger spam filters and load slowly
- Export at quality 80–85 for email — it looks excellent and keeps file size under 200 KB
Use PNG when:
- The image is a logo, icon, or graphic that needs a transparent background
- The image contains text or sharp lines that look blurry or artifact-heavy as JPG
- PNG file size is acceptable — logos are usually under 50 KB as PNG
For email signatures specifically: use PNG for your logo (transparent background composites cleanly over any email theme) and JPG for any photo.
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Oversized emails cause problems beyond slow loading:
- Gmail clips emails over 102 KB — recipients see a "show full message" prompt, and your call-to-action may be hidden below the clip.
- Spam filters flag heavy emails — email marketing platforms recommend keeping total email size (HTML + images) under 100 KB for best deliverability.
- Load time on mobile — a 1 MB image in an email on mobile data is a bad experience.
Best practices for email image sizes:
- Hero images: JPG at quality 75–80, under 200 KB
- Logos: PNG, under 30 KB
- Product thumbnails: JPG at quality 75, 200–300 pixels wide, under 50 KB each
Host images externally (on your website or a CDN) rather than embedding them — embedded images inflate total email file size dramatically.
Best Format for Email Signature Images
Email signatures have specific requirements:
- Logo in signature: PNG with transparent background — renders cleanly on both light and dark email themes without a white box around it.
- Headshot photo: JPG, 100–200 pixels wide, quality 80. Higher resolution is unnecessary for a small headshot.
- Banner image: JPG for photographic banners, PNG for graphic banners with text.
Avoid GIFs in email signatures unless you specifically need animation — they are much larger than equivalent static images. A GIF version of a logo or headshot is 3–10x larger than a static PNG with no benefit.
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Open Free JPG to AVIF ConverterFrequently Asked Questions
Can I use AVIF images in email newsletters?
Not safely. Outlook — still the dominant email client in enterprise — does not support AVIF. Sending AVIF images in email means Outlook users see broken image boxes. Stick with JPG and PNG for emails until AVIF gains universal email client support, which is not expected soon.
What format does Gmail use for images?
Gmail displays JPG, PNG, and GIF natively. Gmail strips AVIF and most WebP images in many contexts. For Gmail-targeted emails, JPG and PNG are the reliable choices.
How do I make an email image smaller for Gmail's 102 KB clip limit?
The 102 KB Gmail limit applies to the total HTML of the email, not individual images. Email images should be hosted externally (on your website) and referenced by URL — they do not count toward the 102 KB HTML limit. The limit covers your email's text and code, not externally hosted images.
Should my email signature logo be JPG or PNG?
PNG with a transparent background. Email signature logos need to look clean on both light and dark backgrounds — a transparent PNG adapts to whatever background the recipient's email client uses. A JPG with a white background will show a white box on dark-themed email clients.
