AVIF Converter

What is AVIF?

AVIF — AV1 Image File Format — is a still-image format that wraps frames coded with AV1, the royalty-free video codec from the Alliance for Open Media. Because it borrows AV1's modern compression tools, AVIF is substantially more efficient than the older formats it competes with: a representative photo encoded as AVIF is typically around 40–50% smaller than the same photo as a quality-matched JPG, and meaningfully smaller than WebP as well. The exact ratio depends on the image and the quality setting, but the direction is consistent — AVIF wins on bytes-per-pixel for most photographic content. AVIF is not a one-trick format. It supports lossy compression for photos, fully lossless compression for graphics and screenshots, and a complete per-pixel alpha channel for transparency — so a single format covers the jobs that previously split between JPG and PNG. It also handles wide colour gamuts and high dynamic range. Browser support is now broad: Chrome and Firefox have decoded AVIF for years, and Safari 16 and later (shipped September 2022) added support, which together covers essentially every browser in active use. The remaining gaps are outside the browser — many desktop design tools, office suites, and email clients still do not read AVIF, which is the main reason you would convert an AVIF back to JPG or PNG.

Convert to and from AVIF

Every AVIF conversion the tool supports, in both directions. Each runs on-device with no upload:

• JPG to AVIF — Shrink existing JPG photos for the web — AVIF typically lands 40–50% smaller at matched quality.
• PNG to AVIF — Compress PNG graphics and screenshots, with lossless mode and the alpha channel preserved.
• WebP to AVIF — Re-encode WebP to AVIF when you want the smaller of the two modern formats for delivery.
• AVIF to JPG — Get a universally compatible JPG for tools, uploads, and email clients that cannot read AVIF.
• AVIF to PNG — Decode AVIF to a lossless PNG for design tools, print workflows, and exact-pixel editing.
• AVIF to WebP — Convert AVIF to WebP for slightly wider tooling support while keeping files small.
• AVIF to transparent PNG — Preserve a transparent AVIF's full alpha channel exactly when exporting to PNG for logos and cutouts.

When to use AVIF (and when not to)

The decision framework is simple once you separate two questions: who consumes the file, and how much do you control the pipeline. Use AVIF when a browser is the consumer and you control delivery. Website hero images, product photos, blog illustrations, and any asset served through a CDN you configure are ideal candidates — the file-size win directly improves load time and Core Web Vitals, and every current browser will render it. Lossless AVIF is also a reasonable choice for screenshots and flat graphics where you would otherwise reach for PNG, since it usually comes out smaller while staying pixel-exact. Do not use AVIF when a piece of software, rather than a browser, will open the file. Many desktop applications, office suites, email clients, and older content management or asset systems still cannot decode AVIF, and will either fail to open the file or strip it. If you are handing an image to a colleague whose tools you cannot verify, attaching it to an email, or feeding it into a print or editing workflow, convert it to JPG (for photos) or PNG (for graphics and transparency) first. The honest summary: AVIF for browser delivery you control, a widely supported format for everything else.

Representative file sizes: JPG vs WebP vs AVIF

Representative example sizes for a single 1920×1280 photographic image encoded at visually comparable quality. Treat these as illustrative of the typical ordering, not as a precise benchmark — exact results vary with the image content and encoder settings.

Under the hood

ConvertMyPic does all of its work in the browser. There is no server in the loop: when you open one of the converters above, the image is read locally, processed by a WebAssembly codec running inside a Web Worker, and written back out — the file never leaves your device, and you can confirm this by watching the Network tab during a conversion. AVIF specifically is handled by the libaom / libavif stack from the Alliance for Open Media. libaom is the reference AV1 codec; libavif wraps it with the AVIF container layer that handles still images, alpha planes, and metadata. The same modules decode AVIF input and drive the AVIF encoder when you convert into the format. Alongside AVIF, the tool uses mozJPEG for JPG encoding, oxiPNG for PNG, libwebp for WebP, and libheif for decoding HEIC. All of these are compiled to WebAssembly and run on your own CPU. Because the codecs are cached after the first visit, the app also works offline as a PWA — install it and every conversion above keeps working with no network connection at all.