Images are usually the heaviest part of a web page, and JPEG, while reliable, is no longer the most efficient way to store them. Converting your JPGs to AVIF can shrink file sizes by 30 to 50 percent at the same visual quality, which means faster page loads, better Core Web Vitals scores, and lower bandwidth bills. If you run a website and care about speed, this is one of the highest-impact optimizations available.
This guide explains why and how to convert JPG to AVIF, which quality settings to use, how to handle browser fallbacks so nobody sees a broken image, and a simple workflow to get started. The browser-based JPG to AVIF tool converts your files locally, so nothing uploads to a server. Let us start with what you actually gain.
Why Convert JPG to AVIF?
The core benefit is file size. AVIF's compression, built on the modern AV1 codec, packs the same image into far fewer bytes than JPEG's decades-old algorithm. Smaller images load faster, especially on mobile connections, and Google's page experience signals reward that speed. For an image-heavy site, switching to AVIF can cut total page weight substantially.
Beyond size, AVIF adds capabilities JPEG lacks: transparency, HDR, and wide color gamut. So even if your immediate goal is speed, you gain a more capable format in the bargain. To understand the technology behind these gains, see what is an AVIF file, and for the head-to-head numbers read AVIF vs JPEG.
How Much Smaller Will Your Images Be?
The savings depend on the image, but a useful expectation is 30 to 50 percent smaller than the equivalent JPEG at the same perceived quality. Photographs with smooth gradients and detailed textures benefit the most. A 200 KB JPEG might become a 100 to 130 KB AVIF with no visible quality loss, and the gap widens further at aggressive compression settings where JPEG would show artifacts.
Across an entire gallery or catalog, those per-image savings compound into meaningful reductions in total page weight and load time. The exact figure varies, so it is worth converting a representative sample and measuring before committing your whole library.
Choosing the Right AVIF Quality Setting
AVIF quality, like JPEG, is a balance between file size and fidelity. A quality setting in the range of 50 to 65 on AVIF's scale often matches the visual quality of a JPEG saved at 80 to 90 percent, because AVIF's compression is more efficient. Start there and adjust:
- For hero images and photography where quality is paramount, lean higher to keep every detail crisp.
- For thumbnails and background images viewed small, you can push compression harder for tiny files.
- For graphics with text or sharp edges, use a higher setting or AVIF's lossless mode to avoid fuzziness.
Always start from the highest-quality source you have. Converting an already-compressed JPEG to AVIF works, but starting from an original gives the cleanest result.
How to Convert JPG to AVIF Step by Step
Here is the complete workflow:
- Open the converter. Go to the JPG to AVIF tool in your browser.
- Add your JPG files. Drag in one image or a whole batch.
- Choose a quality level. Start around the mid-range and adjust after previewing.
- Convert. Let the tool encode your AVIF files locally.
- Download. Save the AVIF files, or the ZIP if you converted a batch.
- Compare sizes. Check the file size reduction against your originals before rolling out.
Because encoding AVIF is computationally heavier than JPEG, a large batch may take a little longer, but the resulting files are worth the wait.
Serving AVIF with a Fallback
AVIF is widely supported in modern browsers, but not universally, so you should never serve it alone in production. The standard technique is the HTML picture element, which offers AVIF first and falls back to WebP or JPEG for browsers that cannot display it:
- First source: the AVIF file for capable browsers.
- Second source: a WebP version for broader support.
- Final img tag: a JPEG that every browser can render.
This way each visitor automatically receives the smallest format their browser supports, with no broken images. To create the WebP layer, the PNG to AVIF and related tools help build out your formats, and our AVIF browser support guide explains exactly which browsers need the fallback.
JPG to AVIF vs JPG to WebP: Which Should You Use?
Both modern formats shrink your JPGs, but they differ:
- JPG to AVIF gives the smallest files and best quality per byte, ideal when maximum compression matters. Encoding is slower.
- JPG to WebP encodes faster and has marginally broader support, a good choice for high-volume pipelines.
Many sites use both, serving AVIF first and WebP as the fallback. For the full comparison, read AVIF vs WebP. And if you ever need to reverse course and make an AVIF universally openable, the AVIF to JPG tool converts it back to JPEG.
Should You Convert Your Whole Library?
Converting an entire image library to AVIF delivers the biggest cumulative speed gain, but weigh it against effort and your audience. If most of your visitors use modern browsers and you can implement fallbacks, the payoff is substantial. If your workflow cannot yet produce fallbacks, start with your heaviest, most-viewed images first, where the savings have the most impact. Our broader guide on whether you should use AVIF helps you decide.
Conclusion
Converting JPG to AVIF is one of the most effective ways to speed up an image-heavy website, cutting file sizes by 30 to 50 percent while keeping quality high. Choose a sensible quality level, always pair AVIF with a WebP or JPEG fallback, and start with your most-viewed images. Ready to make your pages lighter and faster? Open the JPG to AVIF converter, drop in your photos, and download dramatically smaller files. Explore the full avif.tools suite to convert in any direction.