JPG to AVIF Converter
Convert JPG to AVIF — often 50% smaller than JPEG at the same visual quality — all in your browser.
What Is AVIF?
AVIF (AV1 Image File Format) is a modern image format built on the AV1 video codec, developed by the Alliance for Open Media (AOMedia) — the same group behind Netflix, Google, and Amazon's video compression work. It typically produces files around 50% smaller than JPEG at comparable visual quality, and supports HDR, wide color gamut, and up to 12-bit color depth.
Google has indexed AVIF images since April 2024, and over 93% of browsers in use today can display it natively.
Why Convert JPG to AVIF?
If you're publishing images to the web, smaller files mean faster page loads — a factor search engines and Core Web Vitals scoring both reward. Converting your existing JPG photos to AVIF can meaningfully cut their file size without a visible drop in quality, which adds up quickly across a whole site's worth of images.
How This Tool Works
This converter runs entirely in your browser using a real libavif encoder compiled to WebAssembly — the same AV1-based encoding technology used to produce AVIF files elsewhere. Your JPG is decoded, re-encoded as AVIF at the quality level you choose, and never uploaded to any server. AVIF encoding is more computationally demanding than older formats, so larger images or higher quality settings take longer to process — often several seconds for large photos.
JPG vs AVIF — When to Use Each
| Feature | JPG | AVIF |
|---|---|---|
| File size | Larger | Smaller (roughly 50% of JPEG at similar quality) |
| Image quality | Good, but blocky artifacts at high compression | Excellent, especially at low bitrates |
| Transparency | Not supported | Supported |
| HDR / wide color | Not supported | Supported |
| Compatibility | Universal — every device, browser, and editor | ~93% of browsers, growing website adoption |
| Encoding speed | Fast | Slower, especially at high quality |
Keep JPG When
- Maximum compatibility matters more than file size
- Uploading to software or platforms without AVIF support
- Sending to a printing service or older device
Convert to AVIF When
- Serving images on your own website to modern browsers
- Page load speed and Core Web Vitals matter
- You want smaller files without a visible quality hit
- Storage space for a large photo library is a concern
Common Scenarios for JPG to AVIF Conversion
Speeding Up a Website
Replacing JPG images with AVIF versions can meaningfully cut page weight, which improves load times and Core Web Vitals scores — factors that affect both user experience and search ranking.
Shrinking a Large Photo Library
If you're archiving thousands of photos and storage space is a concern, converting to AVIF can significantly reduce total file size while keeping visual quality close to the original.
Reducing Bandwidth for Mobile Visitors
Smaller images load faster on slower mobile connections and use less of a visitor's data — worth doing for any image-heavy page aimed at a broad audience.
Preparing Images for a Modern CMS
If your content platform already supports AVIF, converting your JPG source images before upload lets you take advantage of the smaller file sizes from the start, rather than relying on the platform's own (often lower-quality) automatic conversion.
Testing Format Support
Before committing your whole site to AVIF, converting a handful of sample images lets you compare file size and visual quality directly against your originals — see Image Compressor if you want to try JPEG-side compression instead.
Other Ways to Convert JPG to AVIF
You can also convert JPG to AVIF using GIMP (with the AVIF export plugin) or Squoosh, Google's own in-browser image codec playground. FileCast is useful when you want a quick conversion without installing a plugin or leaving this page.
Frequently Asked Questions
Is it safe to convert my photos here?
Yes. This tool encodes your JPG as AVIF entirely in your browser, using a WebAssembly build of libavif. Your image is never uploaded to a server — when you close the tab, all data is gone.
What does the quality slider actually control?
It controls how much detail the AVIF encoder keeps versus how small the resulting file is. Higher quality produces a larger, more faithful file; lower quality produces a smaller file with more compression artifacts. The default (65%) is a reasonable balance for most photos — try 80–90% if you notice visible quality loss.
Why does conversion take longer than converting to JPG or WebP?
AVIF encoding is genuinely more computationally intensive than older formats — it's doing real AV1-based video-codec-derived compression, not a simpler algorithm. Larger images and higher quality settings both increase processing time, sometimes to several seconds for large photos. This all happens on your device; there's no upload involved.
Will everyone be able to open the AVIF file I download?
Most people, yes — AVIF is supported by all major browsers and is well over 93% of browsers in current use. Some older software, certain photo editors, and a handful of platforms still don't support it, so it's worth checking your intended destination if you're unsure.
Can I convert multiple JPG files at once?
Currently, this tool converts one file at a time. Drop a file, convert it, download, then click "Convert Another" for the next one. Batch conversion is planned for a future update.