How to Convert JPG to AVIF for Faster Websites

To convert a JPG to AVIF, upload the photo to a browser-based AVIF converter, pick a quality between 60 and 75, click convert, and download the .avif file — you will typically end up with an image about half the size for the same visual quality. AVIF is the AV1-based format that modern performance-focused sites reach for when they want smaller pages and better Core Web Vitals.

This guide walks through the conversion, explains when AVIF is the right call, and shows how the savings translate into faster load times and cleaner PageSpeed reports.

Why convert JPEG to AVIF at all?

JPEG has served the web for three decades, but its compression is dated. AVIF uses the same intra-frame technology as the AV1 video codec, so it squeezes far more detail into fewer bytes. For photographers publishing galleries, developers chasing a green Lighthouse score, or anyone shipping a media-heavy landing page, that difference is the gap between a sluggish site and a snappy one. Smaller images mean a faster Largest Contentful Paint, and LCP is a ranking signal — so this is as much an SEO task as a design one.

How to convert JPG to AVIF in your browser

1. Upload the JPG or JPEG you want to shrink. It stays on your device the entire time.
2. Drag the quality slider. A setting of 60 to 75 is the sweet spot — most viewers cannot tell it apart from the source, yet the file drops sharply.
3. Click Convert to AVIF and read the before/after size comparison so you can see the exact savings.
4. Click Download to save the finished .avif file, then drop it into your project.

AVIF vs WebP vs JPEG: which format when?

The three formats overlap, but each has a clear niche. This table sums up the trade-offs so you can decide without guessing.

The professional pattern is to serve AVIF with a WebP or JPEG fallback using the HTML <picture> element, so every visitor gets the smallest file their browser understands. One honest caveat: creating AVIF in the browser needs a recent Chromium-based browser like Chrome or Edge. If yours cannot encode it, the tool says so clearly rather than failing silently.

Key features and benefits

• Converts JPEG to the modern AVIF format with one click
• Adjustable quality slider to balance size against fidelity
• Before/after size comparison so you can prove the savings
• Typically 40-60% smaller than the source JPG
• Clear notice if your browser cannot encode AVIF
• Fully local — your images are never uploaded, and it works offline as a PWA

Try the JPG to AVIF Converter now — it's free and runs entirely in your browser.

Frequently asked questions

Is AVIF really better than JPEG?

For compression, dramatically so — an AVIF file is commonly half the size of a JPEG that looks identical, and it adds transparency, HDR and wide color support that JPEG lacks. JPEG only keeps the edge in very old software that predates AVIF.

Which browsers can create AVIF files?

In-browser AVIF encoding currently works in recent Chrome, Edge and other Chromium browsers. Firefox and Safari can display AVIF but usually cannot encode it through the canvas, so switch to Chrome or Edge if conversion fails.

What quality setting should I use?

AVIF stays crisp at surprisingly low values. Start around 60 for web photos, and only climb to 70-80 if you spot smoothing in fine textures. Above 80 you gain little but file size.

Should I choose AVIF or WebP for my site?

AVIF compresses roughly 20-30% smaller than WebP but encodes more slowly and needs newer browsers to create. The ideal setup serves AVIF first and falls back to WebP, giving you the best of both.

Does the conversion lose quality?

Both formats are lossy, so re-encoding discards a little data — but AVIF is so efficient that at moderate settings the loss is invisible while the file halves. Always keep the original JPG as your master copy.

Related free tools

• AVIF to JPG Converter — go the other way when software can't open AVIF.
• Convert to WebP — create the fallback image for your picture element.
• Image Compressor — shrink JPG and PNG files without changing format.
• JPG to PNG Converter — when you need lossless output with transparency.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio that builds web apps, SaaS platforms and custom software for businesses. If you need a performance-tuned website or a bespoke tool built for your team, explore ByteVancer's services and get in touch about your next project.