AVIF Converter
Convert any image to AVIF in your browser. You get an AVIF encoded with libavif (AV1) compiled to WebAssembly, at the quality you choose. AVIF is best for maximum compression on modern websites. Batch convert any number of files; nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG, PNG, WebP, HEIC, AVIF, GIF, TIFF, SVG, RAW, PSD, JXL, BMP, ICO and more
How to use Convert to AVIF
- 1
Drop your images or click to choose them. You can also paste from the clipboard.
- 2
Set the quality. AVIF quality numbers run lower than JPEG: around 55 to 65 already looks excellent. Encoding is slow on phones.
- 3
Click Convert. Each file is processed on your device in a background thread.
- 4
Download files one by one or all at once as a ZIP.
Why use Aback Images for convert to avif
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
Fast batch conversion
Several files are converted in parallel worker threads, with per-file progress and cancel.
Content-checked input
Files are identified by their bytes, not their name, so a mislabelled file still converts correctly.
Real control when you want it
Resize, rotate, background colour, metadata and codec options sit under More options.
About Convert to AVIF
About AVIF
AVIF uses the AV1 video codec for still images. It is the most efficient widely supported format, often half the size of JPEG, with HDR, wide colour and transparency, but encoding is slow.
An AVIF is a HEIF file, the same ISO base media boxes as MP4, with the brand 'avif'. The picture is an AV1 key frame stored as an image item, and its size, colour and pixel layout are item properties.
Strengths: Often 50% smaller than JPEG; Excellent at low quality settings; Transparency, HDR and 10/12-bit colour.
Drawbacks: Slow to encode, especially on phones; Not supported by some older software; Can smooth away fine texture at low quality.
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Guides
WebP vs AVIF: what AVIF is and when it is worth it
AVIF often makes photos around half the size of JPEG, but it is slow to encode and not accepted everywhere. How it compares with WebP and when to use each.
2 min read
Responsive images with srcset and sizes, explained
Serve the right image width to each screen: how srcset and sizes work, which widths to generate, and how picture adds AVIF and WebP with a fallback.
2 min read
Frequently asked questions
What quality should I choose for AVIF?
AVIF quality numbers run lower than JPEG: around 55 to 65 already looks excellent. Lower values give much smaller files with gentle softening. Encoding is CPU-heavy, so large batches take a while on phones.
Which apps open AVIF files?
Chrome, Edge, Firefox, Safari 16 and later, Windows 11 Photos, macOS Preview and recent editors. It opens in Chrome 85+, Edge, Firefox 93+ and Safari 16+.
Which formats can I convert from?
Anything this site can read: JPG, PNG, WebP, AVIF, HEIC, GIF, SVG, TIFF, BMP, ICO, JPEG XL, PSD, RAW and more. Files are identified by their bytes, so a mislabelled file still converts.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.