Resize AVIF Image Online

AVIF is the newest of the modern web image formats, designed to deliver the same quality as JPEG at roughly half the file size, with extras like HDR color and full transparency. Photographers, developers, and performance teams adopt it precisely because it squeezes the most quality out of the fewest bytes. Yet even AVIF files exported from cameras or converters often arrive larger than needed for a specific frame, and resizing them usually means opening heavy software. For a quick shrink or a transparent asset at an exact size, that overhead is unnecessary, and shooting in AVIF already saves card space so a tight resize keeps that efficiency all the way to the web. Performance budgets reward small assets, so sizing AVIF correctly is a real win.

UnoIMG’s free AVIF resizer makes the job effortless in the browser. Drop a single image or a whole folder of AVIFs and every file is queued at once. Choose how to size them: scale by a percentage, set an exact target width while the height follows the ratio, enter precise width and height, or snap to a social preset like Instagram Square 1080×1080 or YouTube Thumbnail 1280×720. By default the tool keeps the AVIF format where the browser supports it, so the alpha channel and every transparent pixel survive the resize untouched; you can also pick PNG for maximum compatibility, WEBP for broad support, or JPEG if a solid background is fine. A quality slider fine-tunes JPEG/WEBP output while the resize uses the image’s real pixels so the result stays crisp.

The payoff reaches everyone who ships next-gen web graphics. Web developers resize hero images and transparent assets so pages load instantly; photographers export web galleries that stay sharp on every screen; marketers scale product and social images without losing clean edges. E-commerce stores fit AVIF cutouts into category grids, and agencies prepare client assets in exact sizes. Teachers resize diagram art for worksheets, and app teams shrink icons for faster installs. Social creators reuse the same resized set across every platform. Each result appears with its own preview, so you can compare several versions on screen and pull them all down in one ZIP.

Best of all, the process is private and free. Resizing runs entirely in your browser, so your AVIFs are never uploaded to a server or stored anywhere—nothing leaves your device, which keeps sensitive designs and logos fully on your machine. There is no watermark, no account, and no desktop software to install. Download each image on its own or grab everything at once as a single ZIP, which makes bulk asset prep fast and tidy. Whether you keep AVIF for its tiny size, switch to WEBP for support, or export JPEG with a background fill, UnoIMG fits naturally into any daily workflow, helping you size the perfect image in just a few seconds.