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Filesvo

JPG to AVIF Converter

Re-encode JPG photos as AVIF, the most space-efficient image format the web currently supports. No browser can write AVIF, so Filesvo ships an AV1 encoder that runs on your own machine — your photos still never leave it.

or drag and drop JPG/JPEG files here — you can also paste from the clipboard

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

  1. Select or drop JPG files, or paste an image from your clipboard.
  2. Set the AVIF quality — 60% already looks close to a high-quality JPG.
  3. Click Convert to AVIF. The first file waits for a one-time encoder download.
  4. Download the results.

Why AVIF instead of JPG

AVIF stores an image using AV1, a video codec, and it is dramatically better at compression than the 1992 JPEG algorithm. The same photo at a comparable appearance typically lands well under half the size, which is why image-heavy sites have been moving to it.

The catch is encoding. Browsers can display AVIF but none of them can create it — ask a canvas for AVIF and it quietly hands back a PNG instead. Filesvo therefore carries the libaom AV1 encoder compiled to WebAssembly. It downloads once per visit, is then cached by your browser, and does the work locally.

Because it is a real video-grade encoder, AVIF takes noticeably longer than saving a JPG or WebP — expect a second or two per large photo rather than an instant. Keep the JPG originals as your masters and publish the AVIF copies.

Private by design

Your files are processed directly in your browser using open-source codecs compiled to WebAssembly that run inside the page and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

The engine is a static file your browser downloads once and then caches — the only network request this tool makes. It is used exactly as its authors published it; see the engines and their licences.

Frequently asked questions

Why does the first conversion take longer?
No browser can encode AVIF, so the first conversion downloads the libaom AV1 encoder — a 3.5 MB file that arrives as roughly 1.1 MB once your connection compresses it. Your browser caches it, so every conversion after that starts immediately — including on your next visit.
How much smaller are the AVIF files?
It depends entirely on the photo and the quality you pick. AVIF is usually a large improvement on JPG at matched appearance, but Filesvo doesn't guess — it shows the exact before-and-after size for every file, and says so plainly if an output comes out larger.
Which browsers can display AVIF?
Chrome, Firefox, Edge and Opera have supported it for years, and Safari since 16.4 (macOS Ventura and iOS 16.4). Older software — desktop editors, office suites, some upload forms — often still can't open it, so keep a JPG copy for anything outside a browser.
Are my photos uploaded?
No. The encoder itself is downloaded to you; your images are never sent anywhere. Decoding and encoding both happen inside your browser.

Related Filesvo tools

PNG to AVIF

Convert PNG images to AVIF with transparency preserved — encoded on your device, never uploaded.

AVIF to JPG

Convert AVIF images to universally supported JPG right in your browser — no upload needed.

JPG to WebP

Convert JPG photos to smaller WebP files for faster websites — processed in your browser.