JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use in 2026?

The "right" image format question used to be simple: JPG for photos, PNG for everything else. In 2026 there are four mainstream formats - JPG, PNG, WebP, AVIF - plus rising contenders (JXL, HEIC, APNG). The differences in file size are huge: the same photo can range from 80 KB to 800 KB depending on which format you pick. This guide cuts through the hype with concrete numbers and a pick-rule per use case.

TL;DR pick-rules

• Photo on the public web today: WebP with a JPG fallback.
• Photo on archive or in print: JPG quality 90+, or HEIC if Apple-only.
• Logo, icon, or screenshot: SVG if vector, PNG if raster.
• Modern web project willing to drop IE/legacy Safari: AVIF with WebP fallback.
• Animation: WebP for video-like motion, APNG for transparent lossless, GIF only when the destination forces it.

A quick tour of the four formats

JPG (JPEG) dates from 1992 and is universally supported. It uses lossy DCT-based compression that is excellent for photographs but smears sharp edges. It does not support transparency.

PNG dates from 1996 and uses lossless compression. Great for graphics, screenshots and anything with sharp edges or required transparency. Larger files than JPG for photos.

WebP shipped in 2010 (Google), supports both lossless and lossy modes, full transparency, and animation. Native support in every modern browser since 2020.

AVIF shipped in 2019, built on the AV1 video codec. Best-in-class compression for both photographic and graphical content. Native support in Chrome, Edge, Firefox, and Safari 16+.

Real numbers: the same photo at every quality

I ran the same 12 MP DSLR photograph through each format at a quality setting that produced no visible artefacts on a 4K monitor. Lower number is better.

Pick-rules per use case (detailed)

Hero image on a marketing page. Use AVIF as the primary source inside <picture> with WebP and JPG fallbacks. The total bytes saved usually justify the extra build step. Expect 50 to 70 percent smaller files than the equivalent JPG.

Product gallery (many photos per page). Same as above. Compression ratio scales linearly with image count - if you save 1.5 MB per photo over 20 photos, that is 30 MB lighter pages, which directly improves Core Web Vitals.

Logo or icon. SVG if you have the vector source. If you only have a raster, use PNG with transparency for the canonical version and WebP-lossless for the web. Avoid JPG for logos - it smears anti-aliased edges.

Screenshot for documentation. PNG for the canonical archive, WebP-lossless for the web. JPG compresses screenshots poorly because text edges create unique compression artefacts.

Animated graphic. WebP animation is 30 to 70 percent smaller than the GIF equivalent at similar quality and supports full true colour. Use APNG when you need lossless animation with full alpha (rarer use case).

Email attachment. Old-school JPG remains the safest bet because every mail client decodes it. WebP and AVIF still cause "missing image" symbols in older mail apps.

When to ignore the modern formats

AVIF encoding is CPU-intensive. If you are publishing thousands of images per day on commodity hardware, the encode cost may outweigh the bandwidth savings. WebP is a sensible middle ground for that volume.

AVIF decoding takes longer on mobile CPUs than JPG decoding. On a typical mid-range Android phone, the difference is 60 milliseconds versus 120 milliseconds per image - irrelevant for a single hero image, noticeable for a long gallery.

Browser support matters. Below 1 percent of users globally still have browsers without WebP support. If you are serving e-commerce in markets where Internet Explorer remains common (some enterprise / government), keep a JPG fallback in the <picture> element.

Tooling: how to actually produce the files

Free, in-browser conversion handles every common case. Open image converter, drop the source image, choose the target format and quality, download the result. For batch jobs, drag a folder of files; the tool produces a ZIP. For command-line workflows, the open-source cwebp, avifenc, and oxipng tools cover WebP, AVIF, and PNG-loss-less respectively.

When deploying to production, the cleanest approach is to encode once at build time, store all three formats next to each other, and let <picture> tell the browser which one to use:

<picture>\n <source srcset="hero.avif" type="image/avif">\n <source srcset="hero.webp" type="image/webp">\n <img src="hero.jpg" alt="Hero image">\n</picture>

Conclusion

Image format is one of those decisions that quietly compounds: a 50 percent file-size reduction across every image on your site can shave 30 to 50 percent off page weight, directly improving Core Web Vitals and conversion. The good news is that the optimal pick is no longer a guess - WebP-with-JPG-fallback is the safe default for most sites, and AVIF unlocks the last 20 percent of compression where every byte counts.

Run one of your hero images through our image converter at AVIF quality 55, WebP quality 80, and JPG quality 90. Compare the three side by side on the device your audience actually uses. The numbers will make the decision for you.

Frequently asked questions