JPG to AVIF Converter

Convert JPG to AVIF directly in your browser with nothing uploaded to any server. Most people reach this page to shrink JPEG photos for faster-loading websites or smaller storage, because AVIF reaches the same visual quality in roughly 30-50% fewer bytes (work that matters for hero images, product shots, and Core Web Vitals). The catch with every server-based converter is that you have to hand personal or client photos to a stranger's machine first. Here the AVIF encoder runs locally, so your JPG (or JPEG, the two are the same format and extension) is read straight off your disk and converted on your own CPU.

What this conversion actually does (and does NOT do)

This is a lossy, quality-controlled re-encode, and you should keep it that way. AVIF reuses the AV1 video codec's intra-frame compression, which is why an AVIF at equivalent perceived quality is typically 30-50% smaller than the JPEG it came from (some real-world tests report close to 50% savings). AVIF is technically a strict superset of what a JPEG can hold: it supports lossy and lossless modes, alpha transparency, 10/12-bit color depth, wide color gamut, and HDR, where JPEG is lossy-only, 8-bit, opaque, and SDR. So converting never costs you a capability.

The counterintuitive part for this specific pair is that the extra capabilities buy you nothing. Because the source JPEG carries no transparency and only 8-bit color, the AVIF output gains no real benefit from alpha or higher bit depth (and this encoder writes 8-bit AVIF anyway). The win is purely file-size and compression efficiency, not added color or transparency data. There is also a quality nuance: re-encoding an already-compressed JPEG is generational lossy compression, so any existing JPEG blocking, ringing, or blur is baked in and can compound. Best practice is to convert from the highest-quality original you have. If all you have is the JPEG, AVIF's efficiency usually still yields a smaller file that looks as good or better at a sensible quality setting, partly because the artifacts differ: JPEG fails as blocky 8x8 distortions at high-contrast edges, while AVIF degrades later and more gracefully as soft blur, so AVIF at matched file size generally looks cleaner on sharp edges and flat gradients. This page always encodes lossy AVIF at the slider quality, which is the right mode here: lossless AVIF produces poor file sizes for photographic content.

When to choose JPG to AVIF vs the alternative

Choose AVIF when the target is a website. Browser support is roughly 94% globally as of early 2026 (Chrome, Edge, Firefox, Safari, Opera, and Samsung Internet all render AVIF), so it is safe to ship with a JPEG or WebP fallback chain. Keep the original JPEG, on the other hand, when the destination is a document, print workflow, or email, because AVIF support outside browsers is still spotty in 2026 (Microsoft Office, some editors, and many email clients still cannot open it). If you later need an AVIF back in a universally compatible form, the reverse direction is available at AVIF to JPG. If your source already lives in a modern format, WebP to AVIF is the sibling path.

How to convert

1. Drop one or many JPG/JPEG images into the tool; they are read locally and never uploaded.
2. The output format is pre-selected to AVIF; use the quality slider (90-95 for near-lossless, 75-85 for the web sweet spot).
3. AVIF keeps your image as-is here: there is no transparency to flatten because JPEG has none to begin with.
4. Convert; a single file downloads directly, and multiple files download as a ZIP with no count cap.

No upload. It runs on your device.

The conversion logic is Rust compiled to WebAssembly and runs inside your browser tab. There are zero network requests for the file itself, the tool works offline once the page has loaded, and there is nothing to delete afterward because nothing was ever sent. You can confirm this yourself by opening your browser's DevTools Network tab and watching it stay silent while you convert. JPEGs are often personal photos, client deliverables, or proprietary product imagery, and none of that ever touches a server here.

No limits

Unlimited batch conversion, no file-size or file-count cap, no watermark on the output, no sign-up, and no ads. When there is no server doing the work, there is nothing to meter.

Frequently asked questions

Does converting JPEG to AVIF lose quality?

It is a lossy re-encode, so technically yes, but at a sensible quality setting the result usually looks as good as or better than the source. Because you are re-encoding an already-compressed JPEG, any existing artifacts are baked in, which is why starting from the highest-quality original you have gives the cleanest result.

Is AVIF actually smaller than JPEG, and by how much?

Yes. At equivalent perceived quality, AVIF files are typically 30-50% smaller than JPEG, and some real-world tests report close to 50% savings. The efficiency comes from AVIF reusing the AV1 video codec's intra-frame compression rather than JPEG's older DCT scheme.

Are my photos uploaded anywhere when I convert JPEG to AVIF here?

No. The encoder is Rust compiled to WebAssembly and runs entirely in your browser tab, so the file never leaves your device. You can verify there are zero network requests for your image by watching the DevTools Network tab during conversion.

Can I convert multiple JPG files to AVIF at once (batch)?

Yes, drop as many JPG or JPEG files as you like and they convert in one pass. A single image downloads directly, while multiple images come back as a ZIP, with no file-count cap because there is no server quota to enforce.

Do all browsers support AVIF in 2026?

Browser support is roughly 94% globally as of early 2026, including Chrome, Edge, Firefox, Safari, Opera, and Samsung Internet. It is safe to ship AVIF on the web as long as you provide a JPEG or WebP fallback for the small remaining share.

Should I convert an already-compressed JPEG to AVIF, or use the original?

Use the highest-quality original whenever you can, because re-encoding a compressed JPEG is generational lossy compression and stacks new artifacts on top of old ones. If the JPEG is all you have, AVIF's efficiency still usually produces a smaller file that holds up well at a reasonable quality setting.

What quality setting should I use when converting JPG to AVIF?

This page always encodes lossy AVIF, which suits photos (lossless AVIF produces poor sizes for photographic content). A setting of 90-95 is near-lossless, while 75-85 is the practical web sweet spot that captures most of the size savings.

Is it worth converting JPEG to AVIF for my website?

For web delivery it usually is, since the 30-50% size reduction directly improves load time and Core Web Vitals on image-heavy pages. Reserve it for website images though, because AVIF support outside browsers is still limited, so keep JPEG for documents, print, and email.

Can I open or use an AVIF file in Photoshop, Word, or other apps?

Support outside browsers is still spotty in 2026, so apps like Microsoft Office and some editors and email clients may not open AVIF. If you need broad compatibility, keep the JPEG for those workflows and use AVIF only for website images.

How do I convert AVIF back to JPEG if I need to?

Use the reverse direction at AVIF to JPG, which decodes the AVIF and writes a standard JPEG. Note that going back to JPEG is another lossy step and will not recover detail that the AVIF encode already discarded.

Related tools: explore the full image tools hub, or batch-shrink existing files with image compress.