How to convert WebP to AVIF
- Click Choose files or drop your WebP images into the box above — up to 10 at a time on the free plan.
- Optionally set the quality — AVIF takes a few seconds per photo to encode.
- Conversion starts right away. Download each AVIF file, or click Download all to get them as one ZIP.
WebP vs AVIF
| WebP | AVIF | |
|---|---|---|
| Compression | Lossy or lossless | Lossy or lossless |
| Transparency | Yes | Yes |
| Animation | Yes | Yes |
| Colors | 8 bits per channel, full alpha | 8, 10 or 12 bits per channel, HDR |
| File size (photos) | Very small | Smallest |
| Opens on | All modern browsers (Chrome, Edge, Firefox, Safari 14+); some older apps and editors cannot open it | Chrome 85+, Firefox 93+, Safari 16+; few desktop apps and editors |
| Best for | Images on websites, where smaller files mean faster pages | The smallest possible web images with high quality |
About WebP and AVIF
What is WebP?
WebP was created by Google to make web pages load faster. Lossy WebP is typically 25–35% smaller than a JPG of similar quality, and lossless WebP is about a quarter smaller than PNG. It also supports transparency and animation. Many websites now serve WebP automatically, which is why images you download often end up as .webp files that older software refuses to open.
- Much smaller than JPG and PNG
- Transparency and animation
- Lossy and lossless modes
- Not accepted by some upload forms, print shops and older apps
- Windows Photo Viewer and older Photoshop versions cannot open it
What is AVIF?
AVIF is a modern image format based on the royalty-free AV1 video codec. It usually beats both JPG and WebP on file size — often around half of a comparable JPG — and supports transparency, HDR and wide color. Encoding it takes noticeably longer than JPG or WebP, and support outside web browsers is still limited.
- Best compression of any common format
- Transparency, HDR and wide color
- Royalty-free
- Slow to encode
- Limited support in desktop apps and editors
Why GlideConvert?
- Private by design. Your files are converted on your own device by your browser — they are never uploaded to a server. That keeps them private, avoids upload waits and means there is no queue.
- Fast. Images convert in a fraction of a second; video uses your device’s hardware encoder.
- Free. No sign-up, no watermark. 10 images, 5 audio files or one video at a time — Pro lifts the limits and removes ads.
Frequently asked questions
Will converting WebP to AVIF reduce quality?
AVIF uses lossy compression, but at the default quality of 90% the difference is practically invisible, even though the WebP was already compressed. Move the quality slider down for smaller files, or up to 100% for the best possible result.
Is transparency kept?
Yes. Transparent and semi-transparent areas are kept as they are.
Will the AVIF file be smaller than the WebP?
Usually yes — AVIF compresses photos more efficiently than WebP. The exact saving depends on the image and the quality you choose.
Why do images I download save as WebP?
Many websites now deliver images as WebP because the files are smaller and pages load faster. Your browser saves the image exactly as it was delivered — which is why you end up with .webp files that older apps refuse to open.
Why does AVIF take longer than other formats?
AVIF squeezes images much harder than JPG or WebP, and that takes more computing power — typically one to a few seconds per photo, a bit more on phones.
Can I convert several WebP images at once?
Yes. The free plan handles 10 images at a time, and you can download everything as a single ZIP. Pro removes the batch limit, converts files in parallel and supports files up to 4 GB.
Are my files uploaded to a server?
No. GlideConvert runs entirely in your browser: images are processed with the browser’s built-in codecs and WebAssembly, video and audio with hardware-accelerated WebCodecs (or a WebAssembly build of FFmpeg for older formats). Nothing is sent anywhere — you can even disconnect from the internet once the page has loaded.
Does it work on iPhone, Android, Mac and Windows?
Yes. It works in any up-to-date browser — Chrome, Edge, Safari, Firefox or Samsung Internet — on phones, tablets and computers, with nothing to install. On phones, extremely large images may be scaled down to fit within the browser’s memory limit; you will see a note if that happens.