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Convert WebP to AVIF, Smaller Files With Alpha Kept

Convert WebP to AVIF and get photographs that run 20 to 30 percent smaller, with transparency kept.

or drop the image here

Quick answer

Convert a WebP to AVIF in a couple of clicks. Because AVIF is the hardest format to encode, our server does the heavy lifting to give you the best result, so converting to AVIF may send the image to our server for processing. When several files are converted at once, our server always handles the batch and the download link is deleted within about 2 hours. Both formats compress with quality loss, so this is a second compression pass: color detail already compressed by the WebP encoder is compressed again. For photographs the result is visually near-exact at quality 85, around 42 dB PSNR, and the output is typically 20 to 30 percent smaller than the source WebP. If your WebP has a transparent background, the transparency survives intact. Encode speed is the honest caveat. A 2-megapixel photo takes under a second, an 8-megapixel photo a few seconds, and larger images take longer. The first conversion of a session can also pay a brief one-time warm-up.

How to convert WebP to AVIF

How to convert WebP to AVIF

Drop your WebP onto the upload area or click it to pick a file. The conversion starts the moment the file lands, with no separate convert button. AVIF is the heaviest format to encode, so a single image is sent to our server to produce the best result, and the AVIF comes back ready to download. A small image converts in well under a second, a 2-megapixel photo in about a second, and an 8-megapixel photo in a few seconds. When the AVIF is ready, click Download to save it with the same base name and a new .avif extension. The stats line reports both file sizes so the reduction is visible, and the download link is deleted within about 2 hours.

How much smaller is AVIF than WebP?

How much smaller is AVIF than WebP?

AVIF is built on a modern codec and reaches files roughly 20 to 30 percent smaller than WebP at the same perceptual quality, based on SSIM and DSSIM comparisons across photo test sets. On simple graphics with flat color or hard edges the gap narrows, and WebP can pull even or ahead. The win is largest on photographs, exactly the assets that dominate page weight on most modern sites. A source WebP weighing 32 kilobytes might become 22 to 26 kilobytes as AVIF at equivalent visual quality. For heavily compressed WebP sources the saving narrows further. AVIF browser support now passes 93 percent globally, so the fallback case for modern audiences has shrunk to a small minority.

Does WebP to AVIF preserve transparency?

Does WebP to AVIF preserve transparency?

Yes. WebP supports transparency and so does AVIF, and the conversion carries it through unchanged. A WebP with a transparent background converts to an AVIF with the same transparent background, no white fill, no color shift, no edge halo. This is the opposite of converting to JPG, where transparency is destroyed because JPG has none. If your WebP holds a cut-out logo, a UI sprite, or a sticker on a transparent canvas, AVIF is a safe destination and you do not need to flatten the image first. The transparent layer is encoded alongside the color data at quality 85 and arrives in the output with soft edges intact.

Quality and encode speed

Quality and encode speed

Both formats compress with quality loss, and this pair runs at quality 85. At that setting, photographs measure around 42 dB PSNR, visually near-exact for natural images. Graphics with hard edges or flat color can show mild artifacts. Since the source is already a compressed WebP, this is a second compression pass: information the WebP encoder already dropped cannot be recovered. Speed is the trade-off for AVIF's compression efficiency. On Chrome desktop, a 2-megapixel photo finishes in under a second, an 8-megapixel photo in roughly 3 seconds, and a 24-megapixel shot in 10 to 30 seconds. Firefox runs about four times slower, and a phone is 3 to 5 times slower than desktop Chrome. The first encode also pays a one-time warm-up.

AVIF browser support for delivery

AVIF browser support for delivery

AVIF now reaches over 93 percent of global browsers: Chrome 85 and later, Firefox 93 and later, Safari 16.4 and later, and Edge 121 and later all display it natively. Internet Explorer, Opera Mini, and pre-2022 Safari do not. The practical upshot for delivery is that an HTML picture element serving AVIF with a WebP fallback covers essentially all modern traffic. For sites where compatibility with the remaining few percent matters, keep the WebP fallback in place. For sites confident in a modern-browser audience, AVIF alone is viable. The bandwidth saving makes AVIF first with a WebP fallback the dominant pattern among performance-focused developers in 2026.

Where your file is processed

Where your file is processed

AVIF is the most demanding format to encode, so this pair uses our server to produce the best result, which means converting to AVIF can send your WebP to our server. The work happens, the AVIF comes back, and the download link is deleted within about 2 hours. When you convert several files in one go, our server always handles the batch and zips the results for you, again with the same roughly 2-hour deletion window. If the server is ever unreachable, the page quietly encodes a single image locally instead, keeping that one file on your device. We hold no permanent copy of your image beyond that short processing window. The honest summary is simple: a single AVIF may be made on our server for quality, a batch always is, and nothing of yours is kept around afterward.

How it works

  1. Drop your WebP

    Drag the WebP onto the upload area, or click it to open a file picker and choose one from your device.

  2. Let it convert

    AVIF is the heaviest format to encode, so the image is sent to our server for the best result. The download is removed within about 2 hours.

  3. Review the sizes

    When the AVIF is ready, the stats line shows the WebP source size and the AVIF output size. A 20 to 30 percent drop on photographs is typical.

  4. Download the AVIF

    Click Download to save the file to your device with the same base name and a new .avif extension.

Related conversions

Step back to WebP when you need broader compatibility, or start from a lossless PNG for even larger savings.

AVIF to WebP PNG to AVIF All convert tools

Frequently asked questions

Is AVIF better than WebP?

For photographs delivered to a modern browser audience, AVIF wins on compression: typically 20 to 30 percent smaller files at the same perceptual quality, based on DSSIM measurements across photo test sets. On graphics with flat color and hard edges, WebP is competitive and can occasionally produce a smaller file. Both support alpha and animation. If your audience uses modern browsers, currently around 93 percent of global users, AVIF is the better default. Otherwise, keep WebP as a fallback.

Will I lose quality when converting WebP to AVIF?

Yes, some generation loss is unavoidable. Both formats compress with quality loss, so re-encoding a compressed WebP at AVIF quality 85 adds a second compression pass. For photographs the result is visually near-exact, measuring around 42 dB PSNR. For graphics with hard edges or flat color, expect mild artifacts. A truly exact AVIF is not possible from a compressed WebP source, since the information the WebP encoder discarded is already gone before this conversion starts.

Does AVIF support transparency like WebP?

Yes. Both WebP and AVIF support transparency, and the conversion carries it through exactly, with no white fill, no color shift, and no edge halo. This differs from converting to JPG, where transparency is permanently destroyed because JPG has none. If your WebP has a transparent background, your AVIF will too, with the same soft edges and partially transparent areas intact. No manual flattening is needed before you convert.

How long does WebP to AVIF conversion take?

The first encode of a session loads the encoder in about a second. After that, a 2-megapixel image finishes in under a second on Chrome, 8 megapixels takes roughly 3 seconds, and 24 megapixels can take 10 to 30 seconds. Firefox runs about four times slower on AVIF than Chrome, so a large image on Firefox can stall for half a minute. A phone is 3 to 5 times slower than desktop. For large files or Firefox users, Chrome on a desktop is the fastest path.

Why is AVIF encoding slower than WebP?

AVIF is built on a modern codec that applies far more complex prediction and entropy coding than WebP's older algorithm. The newer format was designed to maximize compression at the cost of encode complexity, accepting slow encode in exchange for best-in-class output. Decoding AVIF is fast in all modern browsers because hardware decode is standard. But encoding is heavy work, and the computation for a large photograph is genuinely intensive, which is why the encode is not instant.

When should I convert WebP to AVIF?

When you control the delivery environment end to end and your audience uses modern browsers, upgrading from WebP to AVIF makes sense for photographs and photo-like content where the 20 to 30 percent size saving translates into faster LCP scores. It is less compelling for small icons or simple graphics where WebP is already compact, for heavy-traffic pages where the encode time would stall a pipeline, or when the destination system requires WebP specifically.

The details

Notes from the team on craft, formats, and the small decisions behind a good result.

Why AVIF beats WebP on photographs
AVIF's compression advantage over WebP comes from the underlying codec. WebP uses the an engine built for video back in 2010. The codec behind AVIF was released in 2018 after years of research aimed at the limits of those older methods. It compresses color detail more aggressively, divides the image into smaller blocks, and packs the result more tightly. The practical result, confirmed across large photo test sets, is that AVIF is typically 20 to 30 percent smaller than WebP at the same perceptual quality on photographs. On computer-generated graphics with flat color and hard edges the gap narrows, because WebP's simpler algorithm handles those patterns efficiently. For any page whose heaviest assets are photographs, the AVIF upgrade has measurable bandwidth impact.
The second lossy pass in practice
When you convert a WebP to AVIF, both the source and the output use compression. The WebP encoder already decided which color information to discard when the WebP was first created, and those decisions are permanent: converting to AVIF cannot recover any of it. The AVIF encoder then makes its own decisions about the color values it receives, at quality 85. For photographs, the combined effect of two compression passes is still visually near-exact at typical display sizes, measuring around 42 dB PSNR on real photo content. For graphics already degraded by their WebP encoding, the second pass can compound visible artifacts. The practical rule: if the source WebP looks clean at the size you plan to display, the AVIF will too. If the WebP already shows compression noise, examine the AVIF carefully before shipping it.
How the alpha channel flows through
Both WebP and AVIF encode transparency as a separate layer alongside the color data. The conversion reads the WebP's transparency mask, composites it at full opacity, then hands it to the AVIF encoder, which writes its own transparency track using intra-frame coding at quality 85. Soft transparency gradients, feathered edges, and partially transparent areas all survive this round trip. The AVIF transparency layer is itself compressed at quality 85, which can introduce barely perceptible fringing at hard edges under extreme zoom. At normal viewing sizes the difference from the source is not visible. For precise work on small icons where the transparent edge must be exact, keep the WebP source and verify the output at full zoom before you ship.
Encode-time expectations across browsers and devices
The AVIF encoder warms up once per browser session, adding about a second to the first conversion. After that, Chromium gives the best throughput: roughly 40 milliseconds for a 0.12-megapixel thumbnail, 250 milliseconds for a 1-megapixel photo, 2.8 seconds for a 4K photo, and 25 seconds for a full 48-megapixel image in the worst case observed. Firefox is the notable outlier, running the same encoder about four times slower, which puts the 4K case near 31 seconds and large files past two minutes. WebKit sits between the two, closer to Chromium. Mobile hardware runs 3 to 5 times slower than desktop across all engines. For routine file-by-file conversion, Chrome on a laptop or desktop is the practical tool. For Firefox users with large images, the honest advice is to switch browsers or keep WebP.
Core Web Vitals and the AVIF upgrade
Pages that serve photographs pay a bandwidth cost for every image loaded. If those images are currently WebP, converting them to AVIF cuts the per-image transfer by roughly 20 to 30 percent on photographs. On a page with a 200-kilobyte WebP hero image, AVIF brings that to roughly 140 to 160 kilobytes. On a product grid with twelve 30-kilobyte WebP thumbnails, AVIF saves roughly 70 to 90 kilobytes of total page weight. These savings directly affect Largest Contentful Paint when the LCP element is an image. At about 94 percent global browser support for AVIF, a picture element serving AVIF first with a WebP fallback covers essentially all traffic. The markup cost is paid once per image component, and the bandwidth saving repeats across every page load afterward.
Why AVIF conversion leans on a server
AVIF is built on a modern codec, the same family used for modern video, and it is deliberately heavy to encode in exchange for its tight files. Doing that work well, especially on large photographs, is far faster and more reliable on a real server than in a phone browser, so this pair sends the image to our server to encode the best possible AVIF. The file is processed and the result is handed back, and the download is removed within about 2 hours, with no long-term storage. Converting several images at once always runs on the server, which assembles the finished set into a single download for you, deleted on the same short timer. If our server cannot be reached, a single conversion is encoded locally instead, that one file staying on your device, accepting a slower encode for the convenience. The trade is plain: server encoding buys you quality and speed on the format that needs it most, and your file is never retained past the brief window it takes to convert.