JPG vs AVIF: Comparing Image Formats

AVIF (AV1 Image Format) is a newer image format developed by the Alliance for Open Media, built on the AV1 video codec. It was designed to address the limitations of older formats by providing significantly better compression efficiency and support for advanced features like HDR (High Dynamic Range) and wider color spaces. While AVIF is technically superior in many ways, JPG has dominated for decades due to its universal browser support and established workflows.

The key difference is that AVIF uses modern compression algorithms that can represent the same image quality with much smaller file sizes, sometimes 50-80% smaller than JPG.

AVIF achieves dramatically better compression ratios than JPG. For the same image quality, AVIF files are typically 30-50% smaller, and in some cases up to 80% smaller. This is because AVIF uses advanced entropy coding and prediction techniques developed for the AV1 video standard. JPG uses relatively simple DCT (Discrete Cosine Transform) compression, which was revolutionary in 1992 but has been surpassed by newer methods.

For example, a 5MB JPG photo might compress to 1-2MB in AVIF format at identical visual quality. This size reduction is especially valuable for mobile users where bandwidth and storage matter, and for websites where reducing page load time improves user experience and SEO performance.

However, file size reduction isn't everything - the time required to encode AVIF is significantly longer than JPG, which can impact your workflow if you're processing hundreds of images.

One of AVIF's major advantages is native support for HDR (High Dynamic Range) images. HDR allows photos to contain a much wider range of brightness values, from deep shadows to bright highlights with detail in both, matching what the human eye can perceive. JPG cannot natively store HDR data - it was designed for standard dynamic range images only.

AVIF also supports a much wider color gamut (beyond sRGB), 12-bit color depth (vs JPG's 8-bit), and lossless compression option. These features make AVIF ideal for professional photography, digital art, and high-end visual content where color accuracy and detail matter most.

JPG, by contrast, is limited to 8-bit color depth and standard dynamic range. For everyday photos and web content, these limitations rarely matter, which is why JPG remains perfectly adequate for most use cases.

JPG has near-universal support across every browser, every device, and every image application created in the last 30 years. This is JPG's greatest advantage. AVIF support, while improving rapidly, is still incomplete. Modern browsers (Chrome 85+, Firefox 93+, Safari 16+, Edge 85+) support AVIF, but older browsers do not.

This creates a practical challenge: AVIF is not yet suitable as the primary format for websites with diverse audiences, as you would need to serve JPG fallbacks to older browsers. However, this is changing quickly as browser support expands and older versions fade from use.

Mobile support varies by device and operating system. Apple's devices gained AVIF support in iOS 16+, while Android devices have better support in recent versions. If your audience includes users on older devices or browsers, you will need to provide JPG as a fallback.

Use JPG when: you need maximum compatibility across all devices and browsers, when simplicity and instant broad support are priorities, for general photography and everyday images, or when file size reduction is less critical than universal accessibility. JPG compression is also straightforward to implement in any system.

Use AVIF when: you are targeting modern browsers and devices only, when file size reduction significantly impacts your project (e.g., streaming services, mobile apps, high-traffic sites), when you need HDR or advanced color features, or when you can provide proper browser fallbacks. AVIF is ideal for professional portfolios, digital galleries, and mobile-first applications.

Many professionals use both formats strategically: serve AVIF as the primary format with JPG as a fallback, leveraging the HTML <picture> element to serve AVIF to capable browsers and JPG to others.

Converting JPG images to AVIF is straightforward with jpg.now's JPG to AVIF converter. Simply upload your JPG file, and the tool will convert it to AVIF format while preserving quality. You can adjust compression settings to balance file size against visual quality according to your needs.

For batch conversions of multiple images, jpg.now supports uploading multiple files at once, which saves significant time compared to converting files individually. This is especially useful if you are migrating an entire image library to the AVIF format.

Keep in mind that AVIF encoding takes longer than JPG due to its more sophisticated compression algorithms. A single image typically takes a few seconds, but patience pays off in the file size savings you will achieve.

AVIF is not the only modern image format worth considering. WebP is another newer format that offers better compression than JPG with better browser support than AVIF, making it a good middle ground. WebP supports some advanced features but not HDR, and browser support is more mature than AVIF.

The format landscape continues to evolve, and choosing between JPG, AVIF, and WebP depends on your specific requirements for compatibility, features, and file size. For most web applications, a strategy of serving WebP to compatible browsers with JPG fallbacks remains practical today, with a future migration to AVIF as browser support becomes near-universal.