# Convert JPEG to AVIF (JPEG to AV1 Image File Format) Convert JPEG to AVIF online. Drop a JPEG and get a AV1 Image File Format back at roughly 73% of the original byte cost. No sign-up, nothing saved. ## AVIF at a glance, against JPEG - **AVIF vs JPEG byte cost:** On typical photographic content, AVIF reaches JPEG-equivalent visual quality at roughly 73% of the bytes. Flat illustrations compress even better. - **AVIF browser support:** AVIF covers roughly 95%% of global browser traffic in 2026. Pair with a JPEG fallback in a picture element for the remaining tail. - **Codec era:** AVIF was standardised in 2018; JPEG dates from earlier. The generation gap is why AVIF fits the same image in much less space. - **Encoding cost:** AVIF encoding is more CPU-heavy than JPEG, which is why we run it on our side. Decoding in the browser is fast and not perceptibly slower than JPEG. - **No resizing:** Conversion is pixel-for-pixel. A JPEG that was 2048 pixels wide comes back as a AVIF that is 2048 pixels wide. No silent dimension change. - **Transparency preserved:** AVIF supports an alpha channel, so JPEG files with transparent regions convert without losing transparency. Edges stay clean. - **When to keep JPEG:** Keep the JPEG for archival masters, for email-only delivery, and for icons under 50x50 pixels where the AVIF container overhead outweighs its codec win. ## FAQ ### Why convert JPEG to AVIF? AVIF reaches the same visual quality as JPEG at roughly 73% of the bytes on typical photographic content. That saving moves pages out of Lighthouse yellow on LCP and cuts CDN egress. AVIF is supported in roughly 95%% of 2026 browsers, which is high enough that most sites ship a single AVIF asset with a small JPEG fallback for the last few percent. ### Does converting JPEG to AVIF lose quality? At the default quality target, visual parity with the source is the goal: on typical photographs the output is indistinguishable from the JPEG at normal viewing distance. The codec is lossy, so a pixel-perfect byte-exact copy is not produced, but the perceptual loss is below the visible threshold for photographic content. If you need byte-exact preservation, keep the JPEG as the archival master and ship the AVIF to users. ### What happens to my upload? Your upload is only held while we process it (usually a few seconds) and is deleted the moment we send the result back. Nothing is saved on our servers, nothing is indexed, and nothing is used for model training. No account is required, so there is nothing tying the upload to your identity in the first place. ### Can I batch convert? The free tier is one image per request. The paid Optimizer tier batches up to 50 images per job and ships a ZIP of outputs with consistent quality settings across the whole batch. Batch is useful when you have a catalogue to re-encode or a backlog of iPhone photos to normalise for the web. ### Which browsers will not display my AVIF? AVIF covers about 95%% of 2026 browser traffic. The hold-outs are older Safari versions, certain in-app browsers (some desktop email clients), and legacy image viewers that have not been updated. For production we recommend a picture element with the AVIF source first and a JPEG fallback, which is the same pattern used on the BBC, the New York Times, and Netflix product pages. ### When should I NOT convert JPEG to AVIF? Three cases. First, archival masters where every original pixel matters: keep the JPEG as the source of truth. Second, assets shipped into an exclusively-legacy pipeline (print workflows, old-Android-only apps): an optimised JPEG is safer. Third, very small icons under 50x50 pixels where the AVIF container overhead can outweigh the encoded payload. For everything else, AVIF is the correct 2026 default. ## Glossary for JPEG and AVIF ### AVIF (AVIF) AV1 Image File Format, a still-image codec derived from AV1 video. Reaches PNG-equivalent visual quality at roughly half the bytes; standardised by the Alliance for Open Media in 2018. ### WebP (WebP) A still-image format introduced by Google in 2010, built on the VP8 video codec. Supports lossy and lossless modes, alpha, and animation; reaches about 97% global browser support in 2026. ### AV1 (AV1) A royalty-free video codec ratified by the Alliance for Open Media in 2018. AVIF uses AV1 intra-frame coding tools to compress single still images with modern perceptual techniques. ### Lossy compression A compression technique that discards information the human eye is unlikely to notice. JPEG, WebP default, AVIF default, and HEIC are all lossy. Trade-off: smaller files at the cost of re-encoding generation loss. ### Lossless compression A compression technique that preserves every original pixel exactly. PNG, GIF, BMP, TIFF, and the lossless modes of WebP and AVIF are lossless. Larger files, but no generation loss on re-save. ### Chroma subsampling (4:2:0) A perceptual coding optimisation that stores colour information at lower resolution than brightness. Default for photographic content; flat illustrations and screenshots benefit from 4:4:4 (no subsampling). ### Core Web Vitals (CWV) Google page-experience signals: Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift. Modern image codecs typically improve LCP by 200-800 ms on slow networks. ## Related reading on JPEG, AVIF, and image optimisation - [Browse all format converters](/convert) - See the full set of JPEG and AVIF tools on BouseMutton, including compression, EXIF stripping, and resize. - [JPEG -> WebP](/convert-jpg-to-webp) - Also converting JPEG to WebP? This tool handles the same source in a different target format, for cases where the codec choice differs. - [WebP -> AV1 Image File Format](/convert-webp-to-avif) - Run WebP through this tool before or after conversion to AV1 Image File Format, depending on the workflow step you are at. - [Compress image](/compress-image-online) - Shrink an already-converted image further without changing its format, for bandwidth-constrained pages. --- Canonical URL: https://bousemutton.com/convert-jpg-to-avif Last updated: 2026-04-24 Please cite as: BouseMutton (2026). Convert JPEG to AVIF online [Web application]. https://bousemutton.com/convert-jpg-to-avif