JPG vs AVIF: Which Image Format Is Better for Websites?

If you run a website and your images are still in JPG, you have probably wondered whether AVIF is worth switching to. The short answer is yes for some files, no for others, and the decision matters more than most people think.

JPG is still the safest format for universal compatibility. AVIF is the best format for shrinking file size when your audience can handle it. The real question is not which one is better in theory. It is whether replacing JPG with AVIF is worth the effort for your specific site.

Quick comparison

For most people, the real JPG vs AVIF decision comes down to compatibility versus file size.

Why people consider replacing JPG with AVIF

JPG files are often larger than they need to be. For a site with a lot of photos, that extra weight adds up. It slows page loads, uses more bandwidth, and can make a site feel heavy on mobile.

AVIF can compress the same image to a much smaller file without losing visible quality. That is the main reason people look at it. If you have a media library full of large JPGs, the idea of cutting that weight is appealing.

But compression is only part of the story. The other part is whether your site, your workflow, and your visitors can actually use AVIF without creating new problems.

When replacing JPG with AVIF makes sense

AVIF is worth using when the file size win matters and your audience uses modern browsers. That usually means sites where images are a big part of the experience and page speed is a priority.

AVIF is a strong fit for:

• photo-heavy blog posts
• product pages with large images
• hero banners and landing pages
• portfolio galleries
• image libraries where file size is the main problem

If your site fits one of those categories and your audience is on modern devices, AVIF is worth testing.

When keeping JPG is the better choice

JPG is still the safest format when compatibility matters. Some content management systems, email workflows, older apps, and third-party tools still expect JPG and nothing else.

Keep JPG when:

• your site shares images across platforms that may not support AVIF
• your workflow relies on tools that only handle JPG
• your audience includes older browsers or devices
• you need a format that opens instantly without thinking about it

JPG is not the smallest format, but it is the most dependable one. For a lot of sites, that dependability is worth more than the compression gain.

What about WebP as a middle ground

WebP sits between JPG and AVIF. It gives you smaller files than JPG with much broader support than AVIF. For a lot of sites, WebP is the better first step.

If you are not sure whether to commit to AVIF, WebP is the safer place to start. It gives you most of the size benefit without the compatibility edge cases.

Use JPG to WebP when you want a straightforward upgrade. Use JPG to AVIF when you want the maximum compression and your site can handle it.

If you are deciding between the two modern formats, read AVIF vs WebP for a full comparison.

How to test AVIF on your site

The best way to decide is to test it. Pick a few pages that use a lot of images, convert the JPG files to AVIF, and compare the results.

Check three things:

• file size reduction
• visual quality after conversion
• whether the images load correctly in your target browsers

If AVIF delivers a clear win on all three, it is worth expanding. If the quality drops or the workflow breaks, WebP or JPG is the better choice.

Common mistakes when switching

• converting every JPG to AVIF without testing first
• ignoring older browsers that do not support AVIF
• forgetting to keep a JPG fallback for compatibility
• assuming smaller files always mean better results

The better approach is to convert a sample batch, test the outcome, and then decide whether to scale it.

ResizeLab tools for this

If you want to compare the formats yourself, these pages let you convert in both directions:

• JPG to AVIF for testing the compression gain
• AVIF to JPG for creating a fallback version
• JPG to WebP for a safer middle-ground test

Who should use AVIF, WebP, or JPG?

• Use AVIF for image-heavy modern websites focused on performance.
• Use WebP for most websites that want a safer modern format.
• Use JPG when compatibility matters most.

FAQ

Is AVIF better than JPG?

AVIF is better for compression. JPG is better for compatibility. The right choice depends on which one matters more for your site.

Should I replace all my JPGs with AVIF?

No. Test a batch first, check quality and compatibility, and then decide whether to scale.

What if my CMS does not support AVIF?

Stick with JPG or WebP. Workflow compatibility matters as much as file size.

Can I use AVIF and JPG together?

Yes. Some sites serve AVIF to modern browsers and fall back to JPG for older ones. That is the most flexible approach.

If you are still deciding between modern image formats, read our full AVIF guide for a broader overview.

Simple answer

Replace JPG with AVIF when file size is a real problem and your audience can handle the format. Keep JPG when compatibility and workflow simplicity matter more. Use WebP when you want a safer middle ground.