Choosing an image format affects page speed, visual quality, browser compatibility and the way visitors experience a website. AVIF is one of the newest options available, and it can produce very small files with impressive image quality. However, smaller files do not automatically make AVIF the best choice for every image.
The right format depends on what the image contains, how it will be used, which browsers must support it and how much control you have over image delivery. A modern website may use several formats instead of converting every file to AVIF.
This guide compares AVIF with WebP, JPEG, PNG, GIF and SVG. It also explains the practical criteria to use when selecting a format, including transparency, animation, editing needs, compatibility and compression.
What AVIF is and why it matters
AVIF is an image format based on the AV1 video compression technology. A codec is the system used to encode and decode digital media. AV1 was designed for efficient video compression, and AVIF adapts some of that technology for still images and animated images.
AVIF supports both lossy and lossless compression. Lossy compression reduces file size by discarding some visual information, while lossless compression preserves the original data. In practice, lossy AVIF is often used for photographs and other detailed images where reducing download size is important.
The format can also support transparency, wide color ranges, high bit depth and animation. These features make AVIF technically flexible. Its main challenge is not capability, but the balance between encoding time, decoding support, editing support and predictable results.
AVIF files can take longer to create than JPEG or WebP files, especially when using demanding quality settings. This matters if a website generates many image sizes on demand or if images must be processed quickly. A conversion workflow should be tested with the actual files and settings used by the site.
AVIF compared with the main alternatives
No format wins in every category. The following table gives a practical starting point, but the final result depends on the source image, compression settings, dimensions and browser environment.
| Format | Best suited to | Transparency | Animation | Main strengths | Main limitations |
|---|---|---|---|---|---|
| AVIF | Photos, detailed graphics and modern web delivery | Yes | Yes | Strong compression, modern color support and flexible features | Encoding can be slower and support is less universal than older formats |
| WebP | Photos, graphics, icons and general website images | Yes | Yes | Good balance of size, quality and browser support | May not produce the smallest file for every image |
| JPEG | Photographs and complex images without transparency | No | No | Very widely supported and easy to process | Repeated saving can create artifacts and transparency is unavailable |
| PNG | Screenshots, diagrams, logos and images needing lossless quality | Yes | Limited practical use for animation | Sharp edges, lossless compression and reliable transparency | Often much larger than modern compressed formats for photos |
| GIF | Simple, short animations with limited colors | Basic transparency | Yes | Broad support and simple animated image delivery | Limited colors and inefficient for photographic content |
| SVG | Logos, icons, diagrams and other vector artwork | Yes | Possible through vector features | Scales without becoming pixelated and can remain very small | Not suitable for ordinary photographs and requires careful security handling |
AVIF versus WebP
AVIF and WebP are the most direct alternatives for many modern websites. Both can store photographs, illustrations, transparent graphics and animated images. Both can also use lossy or lossless compression, depending on the encoder and settings.
AVIF often has an advantage when the goal is to reduce the size of a photographic image while maintaining a similar visual appearance. This advantage is not guaranteed. A small illustration, screenshot or image with sharp text may produce a better result in WebP or PNG.
WebP is usually easier to adopt because it has broad support across current browsers, image tools and content management systems. It is also a practical fallback when an older browser or an image-processing service does not handle AVIF correctly.
Encoding speed can influence the decision. AVIF encoding may require more processing time, while WebP can be faster for a high-volume workflow. If images are converted only once during publishing, this may not matter. If they are generated for every request, it deserves careful testing.
For many sites, the sensible approach is not AVIF or WebP, but AVIF with WebP as a fallback. The browser can receive the first format it supports through responsive image markup or server-side content negotiation. This requires a correctly configured delivery system, so the website should be tested rather than assuming that a conversion plugin handles every case perfectly.
If you want a simple starting point, TopWebP’s Convert images to WebP tool can help create WebP versions for general website use. WebP remains a strong choice when compatibility and a straightforward workflow are more important than obtaining the smallest possible file in every test.
AVIF versus JPEG
JPEG is still a dependable format for photographs. It has been supported for decades, works with almost every browser and application, and is easy to create. It is often the safest fallback when compatibility is the top priority.
AVIF can offer similar visual quality at a smaller file size, especially for detailed photographs. The exact difference varies with the original image, dimensions, encoder, quality setting and the amount of detail in the scene. A conversion that looks excellent for one photograph may create visible texture loss or soft edges in another.
JPEG has several important limitations. It does not support transparency, so it is not suitable when an image must sit over a changing background. It also uses lossy compression, and repeatedly opening and saving a JPEG can gradually add compression artifacts.
Keep the original camera file or editing master whenever possible. Convert that original into AVIF, WebP or JPEG for delivery instead of converting one already compressed format into another. This reduces the risk of accumulating quality loss.
AVIF versus PNG
PNG uses lossless compression and supports transparency. It is a strong choice for screenshots, interface captures, diagrams and graphics with sharp text or simple color areas. It is also useful when exact pixel data matters more than download size.
For photographs, PNG files are often unnecessarily large. AVIF can usually reduce the size of a photographic image much more effectively, particularly when some controlled lossy compression is acceptable. WebP can also be a good replacement for many large PNG files.
PNG may still be the better option for an image that contains tiny text, precise line art or an editing asset that must remain unchanged. A visually small artifact around a letter or line can be more distracting than a modest increase in file size.
Transparency alone does not mean PNG is required. AVIF and WebP can also store transparent pixels. Test the edges around transparent objects, because compression settings can affect fine details such as hair, smoke, shadows and thin outlines.
AVIF versus GIF and SVG
GIF remains useful for simple animations and situations where maximum legacy compatibility is necessary. Its color palette is limited, making it a poor choice for photographs, gradients and detailed animated scenes. An animated AVIF or WebP file may provide better quality and a smaller download, but browser and application support should be checked for the target audience.
SVG is different from the other formats in this comparison. It describes shapes, paths and text using vector instructions rather than storing a grid of photographic pixels. A logo can remain sharp at many sizes and may be smaller as an SVG than as a raster image.
Use SVG for artwork that is naturally vector-based, such as logos, icons, diagrams and simple illustrations. Use AVIF, WebP, JPEG or PNG for photographs and ordinary pixel-based images. SVG files can contain scripts or external references, so only use files from trusted sources and apply suitable security controls when accepting uploads.
Important criteria when choosing an image format
Image content
Start by identifying the image rather than choosing a format based only on its name. Photographs usually benefit from AVIF, WebP or JPEG. Screenshots and text-heavy graphics need careful testing because compression can blur letters and interface details. Logos and icons may be best as SVG, PNG, WebP or AVIF depending on how they were created.
Visual quality
File size should not be evaluated separately from appearance. Inspect fine textures, faces, foliage, gradients, shadows, text and high-contrast edges. A format that produces a smaller file may still be the wrong choice if visitors notice blocking, ringing, color banding or blurred detail.
Compare images at the size at which they will appear on the page. Looking only at a highly enlarged preview can make small differences seem more important than they are. At the same time, inspect important images closely before publishing, especially product photos and images that represent a service.
Transparency
Choose a format with an alpha channel when the image contains transparent pixels. An alpha channel stores the opacity of each pixel, allowing part of an image to be completely or partially transparent.
AVIF, WebP and PNG support transparency. JPEG does not. If a JPEG is used for an object that should blend into a page background, the transparent area must be replaced with a solid color first, which can create an unwanted rectangle.
Animation
Animated images can be much larger than a still image because they contain multiple frames. AVIF and WebP can be alternatives to GIF, but the result depends on frame rate, dimensions, duration and compression settings.
For complex motion, a properly compressed video may be more efficient than any animated image format. Use an animated image when it improves the user experience and the motion is short, simple and appropriate for the page.
Browser and application support
Support for AVIF is strong in modern browsers, but it is not identical across every browser version, embedded web view, email client, image editor or automated service. A visitor may use an older environment, a proxy that changes image delivery or a tool that cannot decode AVIF.
If broad compatibility is essential, provide a fallback such as WebP or JPEG. Test the complete delivery path, including the server, cache, content delivery network, browser and any image optimization plugin. A format is useful only when the final user can receive and display it correctly.
Editing and workflow
Delivery formats are not always good editing formats. Keep a high-quality original or a project file for future changes. Generate AVIF, WebP, JPEG or PNG copies from that source when publishing.
Consider how quickly files must be converted, whether multiple sizes are created, and whether metadata such as color profiles, orientation and captions must be preserved. A technically efficient format can be inconvenient if it makes the publishing workflow slow or unreliable.
File size at the displayed dimensions
Do not compare formats using original files with different dimensions. Resize each version to the actual display size, then compare the result. Sending a very large image and relying on the browser to shrink it wastes bandwidth regardless of the format.
Responsive images can provide different dimensions for phones, tablets and larger screens. This often has more practical value than changing formats alone. A smaller AVIF that is still several times larger than necessary remains inefficient.
How to test AVIF properly
Use a representative sample rather than a single image. Include photographs, screenshots, transparent graphics, gradients, portraits and images with fine detail if those categories appear on the website.
- Keep the original file unchanged.
- Resize the image to the dimensions required on the page.
- Export AVIF, WebP and the current format using suitable quality settings.
- Compare file size and visual quality at normal display size.
- Inspect difficult areas such as text, edges, faces, foliage and gradients.
- Test the files in the browsers and devices used by the audience.
- Measure the real page rather than judging an isolated image only.
There is no universal quality number that works for every encoder or image. A setting used by one tool may not correspond directly to a setting in another tool. Start with a reasonable setting, compare the output and adjust based on the actual image.
Also test caching and fallback behavior. A page may appear correct in one browser while serving a broken or unnecessarily large file to another. Browser developer tools can show which resource was downloaded, while image inspection tools can help verify dimensions and format.
When AVIF is the best choice
AVIF is a strong candidate when a site serves many photographs, wants to reduce image transfer size and can support a modern fallback strategy. It is especially suitable when the image is viewed rather than edited, transparency or advanced color handling is useful, and the processing workflow can handle the encoding time.
It may not be the best choice for every small icon, screenshot or source asset. A tiny file has little room for savings, and the processing cost or compatibility requirements may outweigh the benefit. WebP can be a simpler general-purpose choice, while PNG or SVG may preserve a graphic more reliably.
The best implementation is often selective. Use AVIF for the images where testing shows a meaningful benefit, keep WebP or JPEG as a fallback, and retain PNG or SVG when their specific strengths matter.
Frequently asked questions
Is AVIF better than WebP?
Not in every situation. AVIF can produce smaller photographic images at a similar visual quality, but WebP often offers a simpler workflow and broad compatibility. Compare both formats using the images, dimensions and browsers that matter to your website.
Should I convert every JPEG to AVIF?
No. Convert images after testing them. Some JPEGs will benefit significantly, while small images or text-heavy graphics may show little improvement or may look better in WebP or PNG. Keep the original JPEG or another high-quality master for future editing.
Can AVIF replace PNG?
It can replace many PNG files used for web delivery, including some transparent graphics and photographs. PNG remains useful for lossless screenshots, precise line art and files that must preserve exact pixel information. Check transparency edges and text before replacing a PNG.
Does AVIF support transparent backgrounds?
Yes. AVIF can store transparency, also called an alpha channel. The result still depends on the converter and its settings, so inspect fine edges such as hair, shadows, smoke and thin outlines after conversion.
Does AVIF support animation?
Yes, AVIF can contain animated images. Whether it is the right format depends on browser support, animation complexity, file size and the tools used to create and serve the file. WebP and GIF may be more practical in some workflows.
Is AVIF suitable for email newsletters?
It may not be the safest default because email clients do not all support modern image formats in the same way. JPEG, PNG and sometimes GIF are generally safer choices for broad email compatibility. Test the exact clients used by your recipients before sending AVIF images.
Does AVIF improve SEO automatically?
No. A smaller, properly sized image can help page performance, but image format alone does not guarantee better search visibility. Use descriptive alternative text, correct dimensions, responsive delivery, accessible pages and a reliable fallback strategy.
What should I use for website photos?
Use AVIF, WebP or JPEG after comparing quality and compatibility. AVIF is worth testing when reducing transfer size is important. WebP is a practical general-purpose option, while JPEG remains a dependable fallback for broad support.
What is the best format for a logo?
Use SVG when the logo is available as clean vector artwork and your delivery setup can serve it safely. PNG, WebP or AVIF may be better when the logo includes raster effects, photographic elements or a workflow that does not support SVG.
Should I keep the original image after conversion?
Yes. Keep an original or high-quality master separately from the web copies. This lets you create new dimensions and formats later without repeatedly recompressing an already compressed file.
Making the final choice
Choose AVIF when it gives your real images a worthwhile size reduction without visible quality problems and your audience can receive it reliably. Choose WebP when you want a strong balance of quality, size, compatibility and easy processing. Use JPEG for dependable photographic compatibility, PNG for lossless graphics and transparency, GIF for simple legacy animation, and SVG for vector artwork.
The most effective image strategy is usually a tested combination rather than a single format everywhere. Resize images correctly, compare output at the intended display size, keep suitable fallbacks and measure the complete page. That approach produces faster pages without sacrificing the quality or compatibility that visitors expect.
Use the related tool
Process your files directly in the browser, for free and without sending them to the TopWebP server.
