AVIF is a modern image format designed to deliver strong visual quality with relatively small files. It is attractive for websites because image files often account for a significant part of the data that visitors download. Smaller images can reduce bandwidth use and may help pages load more efficiently.
However, AVIF is not automatically the best format for every image. The right choice depends on the type of image, its dimensions, the quality required, the browsers and devices used by your audience, and the tools in your publishing workflow. A format that works well for a large photograph may be a poor choice for a logo, screenshot or frequently edited design.
This guide explains when to use AVIF, when to avoid it, how it compares with WebP, JPEG, PNG and SVG, and how to make a practical decision based on testing rather than assumptions.
What AVIF is and why it matters
AVIF is an image format based on AV1 video compression technology. It supports lossy compression, which reduces file size by removing some visual information, and lossless compression, which preserves the image data more precisely.
AVIF can support transparency, animation, high color depth and a broad range of image features. These capabilities make it suitable for photographs, transparent graphics and images with gradients or subtle color changes.
Its main advantage is compression efficiency. For many photographs, AVIF can produce a smaller file than JPEG while maintaining a similar level of perceived quality. A smaller file may reduce download time, mobile data use and storage requirements.
Those benefits depend on the source image, dimensions, encoder and quality settings. A simple icon or an already compressed image may not become smaller after conversion. An image that is too large in its pixel dimensions will also remain inefficient, even when saved as AVIF.
When to use AVIF
Large photographs
AVIF is a strong format to test for photographs used in articles, portfolios, galleries, landing pages, travel websites and online stores. Photographs contain many colors, textures and details, giving modern compression systems useful opportunities to reduce data.
Common examples include product photos, editorial images, landscapes, portraits, background images and large hero images. The potential benefit is greater when the original image is large and the same asset is downloaded frequently.
Resize the photograph before converting it. If an image is displayed at 1200 pixels wide, serving a 5000-pixel version wastes data regardless of the file format. Create versions that match the sizes required by the page and use responsive image delivery when possible.
Websites where bandwidth matters
AVIF can be useful for websites with many images or visitors who often use mobile connections. News websites, recipe websites, real estate listings, travel platforms, online stores and image libraries are all reasonable candidates for testing.
It may also be useful in applications that process user uploads. A service can keep the original file and generate smaller AVIF versions for browser delivery. This approach can reduce the amount of data sent to visitors without replacing the original asset.
Image format is only one part of performance. Resizing, responsive images, lazy loading, caching and sensible loading priorities are also important. AVIF cannot compensate for oversized images, unnecessary scripts or inefficient page architecture.
Transparent photographic images
AVIF supports transparency, so it can be considered for cutout product images, overlays, decorative effects and other raster graphics that need an alpha channel. An alpha channel stores information about which parts of an image are transparent or partially transparent.
Transparent AVIF files may be smaller than equivalent PNG files, particularly when they contain photographic detail. They can also be useful for images with soft shadows, glows and smooth gradients.
Test the result against both light and dark backgrounds. Thin edges, halos or unexpected color changes may be difficult to notice on one background and obvious on another. Confirm that the complete publishing system preserves transparency correctly.
Modern websites with format negotiation
AVIF is easier to adopt when your website can select an image format based on browser support. This process is sometimes called content negotiation. The server, CDN or image service chooses AVIF for compatible browsers and provides another format when necessary.
A public website should not assume that every visitor can display AVIF. Browser support has improved, but support can still vary by browser version, operating system, embedded browser and software tool.
When compatibility matters, provide a fallback such as WebP, JPEG or PNG. The fallback should have the same intended dimensions and should be tested in the environments that matter to your audience.
Images that benefit from more color information
AVIF can handle high color depth and may be useful for images with subtle gradients, smooth shadows or complex color transitions. These characteristics can be important in photography, digital artwork and some product imagery.
Do not assume that extra format capabilities automatically improve every image. Export settings and the original source still determine the final result. Compare the output visually at the size used on the page.
When to avoid AVIF
When broad compatibility is the priority
AVIF may not be the right primary format when an image must open in older browsers, legacy operating systems, older design applications or unfamiliar third-party systems. Public archives, long-lived documents and downloadable assets often need predictable compatibility.
JPEG or PNG may be safer in these cases, even when the files are larger. WebP can also be a practical modern alternative if the required browsers and applications support it. The best format is the one that reaches the intended audience correctly.
When your editing workflow has limited support
AVIF is often more useful as a delivery format than as an editing format. Some image editors, content management systems, plugins and automated tools may not open or export it consistently.
If an image needs regular cropping, retouching, resizing or text changes, keep an editable master in a suitable working format. This might be a layered project file, TIFF, PNG or high-quality JPEG, depending on the project. Export AVIF copies for publication instead of using the compressed delivery file as the only original.
Keeping a master also protects quality. Repeatedly opening and saving a lossy file can cause additional degradation, especially when different quality settings are used during each export.
For logos and simple illustrations
A small logo, line drawing or flat-color icon may not benefit from AVIF conversion. Some files may remain the same size or become larger. If the artwork is made from lines and shapes, SVG is often a better option because it can scale without becoming blurry.
PNG can also be suitable for a small raster logo or interface graphic that needs reliable transparency and sharp edges. Do not convert every file in a folder without checking the output and the visual result.
For screenshots and text-heavy graphics
Screenshots, diagrams and interface images often contain small text, sharp lines and blocks of solid color. Lossy compression can soften characters, create halos around edges or introduce distracting artifacts.
PNG is frequently a good choice when exact sharpness matters. Lossless WebP may also work well. AVIF can still be tested, but the file should be inspected closely at its actual display size and at a larger zoom level.
When encoding complexity outweighs the benefit
AVIF encoding can require more processing than some older formats. For a small website with a few static images, this may not matter. For a platform that processes thousands of uploads, encoding time, server resources and cache behavior deserve attention.
If AVIF only reduces the file slightly while making the publishing workflow substantially more complex, WebP or JPEG may be the more practical solution.
AVIF compared with WebP, JPEG, PNG and SVG
No format is ideal for every type of image. The following comparison is a starting point rather than a substitute for testing.
| Format | Common uses | Main strengths | Important checks |
|---|---|---|---|
| AVIF | Photographs, modern web delivery and transparent raster images | Strong compression and support for modern image features | Browser support, workflow support, encoding time and visual artifacts |
| WebP | General web images, photographs, graphics and transparent assets | Good web support, lossy and lossless modes, transparency and animation | Legacy software support and whether AVIF provides a meaningful improvement |
| JPEG | Photographs and assets requiring broad compatibility | Widely supported and easy to create, edit and deliver | No transparency and possible quality loss after repeated exports |
| PNG | Screenshots, interface graphics, logos and lossless images | Sharp results, lossless compression and reliable transparency | Photographs can be much larger than in modern formats |
| SVG | Logos, icons and vector illustrations | Scales cleanly and can be compact for simple artwork | Not suitable for ordinary photographs |
WebP is often a useful middle ground. It supports many common web requirements and fits into a wide range of tools. If a website already uses WebP successfully, switching to AVIF should be based on measured benefits rather than the belief that a newer format must be better.
A sensible workflow is to keep the original master, generate WebP and AVIF versions, and compare them at the same dimensions. Use AVIF where it produces a meaningful improvement and works reliably. Use WebP, JPEG, PNG or SVG when those formats provide better compatibility, clarity or workflow efficiency.
How to decide which format to use
Identify the image type
Start by determining what the image contains.
- For detailed photographs, compare AVIF, WebP and JPEG.
- For screenshots with readable text, compare PNG with lossless or high-quality WebP.
- For transparent photographs, compare AVIF, WebP and PNG.
- For logos and icons made from shapes, consider SVG first.
- For diagrams with precise lines, prioritize clarity and inspect the result carefully.
Match the image to its display size
Determine the largest size at which the image will appear and create an appropriate version. A desktop image and a mobile image may not need identical dimensions.
Responsive image delivery can provide different files for different screens. Serving a correctly sized image often produces a bigger improvement than changing between two modern formats while keeping the same oversized dimensions.
Compare visual quality fairly
Quality numbers are not standardized between formats or encoders. An AVIF quality value of one number cannot be assumed to equal the same value in WebP or JPEG.
Instead, compare files at the intended display size. Inspect faces, text, hair, foliage, product edges, gradients, shadows and fine textures. Look at the full image and examine important areas more closely. A smaller file is not a good result if it contains visible defects in a meaningful part of the image.
Test the complete workflow
Check more than the exported file. Confirm that your content management system can upload it, your image processor can handle it, your cache can store it, and your delivery rules select the correct format.
Also test thumbnails, social previews, search feeds, email templates and downloadable versions. A main page may support AVIF while another part of the system still requires JPEG or PNG.
Keep a fallback for a broad audience
If your audience uses different browsers and devices, provide a fallback format. Make sure the fallback is actually served when required and that it does not cause both the preferred image and the fallback to download unnecessarily.
Test fallback behavior with the browser versions and devices that are important for your website. Do not rely only on a local test in one modern browser.
Practical AVIF conversion advice
Begin with the highest-quality source available. Converting a small or blurry JPEG into AVIF cannot restore details that have already been lost.
Resize before compression and create separate versions for different display sizes. Avoid using one very large file across every page and device.
Choose lossy or lossless compression according to the image. Lossy AVIF is usually appropriate for photographs intended for web delivery. Lossless AVIF may be useful when preserving image data is important, but it may not be smaller than another suitable format.
Inspect transparent images against light and dark backgrounds. Check for halos, rough edges and unexpected color changes.
Keep the original outside the conversion process. If a new version is needed later, export it again from the master rather than from an already compressed AVIF file.
A practical decision checklist
Before publishing an image, ask the following questions.
- Is the image a photograph, screenshot, logo, diagram or transparent graphic?
- What is the largest size at which it will appear?
- Does it need transparency or animation?
- Do the target browsers and software support AVIF?
- Can the website serve a fallback format?
- Does AVIF produce a meaningfully smaller file at acceptable quality?
- Will the image need to be edited again?
- Have you kept a high-quality master file?
If AVIF passes these checks, it is a sensible format to use or test. If it does not, WebP, JPEG, PNG or SVG may be a better choice. There is no reason to convert an image simply because AVIF is newer.
Frequently asked questions
Is AVIF better than WebP?
Not in every situation. AVIF may produce a smaller file or preserve visual quality more efficiently for some photographs and complex images. WebP may offer easier support across existing tools and workflows. Compare both formats using the actual images, dimensions and quality requirements of your website.
Is AVIF better than JPEG?
AVIF can provide stronger compression and supports features such as transparency. JPEG remains useful because it is widely supported and easy to edit or deliver. Use AVIF when its size and quality benefits matter and your compatibility requirements are covered.
Should every website image be converted to AVIF?
No. Different images have different requirements. Test photographs, screenshots, logos and transparent graphics separately. Some files may become smaller in AVIF, while others may stay the same size, become larger or lose important sharpness.
Does AVIF support transparency?
Yes. AVIF can store transparent areas. You should still test the file in the browsers, content management systems and image tools where it will be used, particularly when the image has soft edges or partial transparency.
Can AVIF be used for logos?
It can, but it is not always the best option. A vector logo is often better stored as SVG because it scales without becoming blurry. For a raster logo with complex effects, compare AVIF with WebP and PNG while checking edge quality, transparency and compatibility.
Is AVIF suitable for screenshots?
Sometimes, but screenshots with small text and sharp interface lines require careful testing. Lossy compression may soften text or create artifacts around edges. PNG or lossless WebP may produce a clearer result even when the file is larger.
Can an AVIF file be edited?
Some modern editors can open and export AVIF, but support varies. For regular editing, keep an original master in an appropriate working format and treat AVIF as a delivery copy. This makes revisions safer and avoids repeated lossy exports.
Why is an AVIF file larger than the original?
File size depends on the source image, dimensions, compression mode, quality setting and encoder. An already optimized source may not benefit from conversion. Lossless AVIF can also be larger than a lossy JPEG or WebP. Compare files at the same dimensions and at an equivalent visual quality.
How can I tell whether an AVIF image is good enough?
View it at the size visitors will see and inspect important details closely. Check faces, text, fine lines, gradients, transparent edges and textured areas. If artifacts are visible in an important part of the image, increase the quality, change the format or use a different compression method.
Should JPEG or PNG versions be kept after conversion?
Keep the original master file and retain a fallback version when your audience or software may not support AVIF. You do not necessarily need to publish every version, but keeping a suitable source and fallback simplifies future edits and compatibility fixes.
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