PNG vs JPG vs WebP vs AVIF: Which Image Format to Use

Picking an image format feels like trivia until a page loads slowly or a logo turns blurry. The good news is that the choice almost always comes down to two questions: is this a photo or a flat graphic, and does it need transparency? Answer those and the right format is usually obvious. Here is what each one is actually good at.

The quick answer

JPG: the photo workhorse

JPG has been the default for photographs for decades, and for good reason: its lossy compression is tuned for the smooth gradients and fine detail in real-world images, producing small files that look fine. It has no transparency, and it is a poor fit for sharp-edged graphics, where its compression leaves visible smudging around lines. For a photo that needs to work everywhere, JPG is still the safe default. Converting an oversized image to JPG is a common quick fix.

PNG: sharp edges and transparency

PNG is lossless and supports transparency, which makes it ideal for logos, icons, screenshots and anything with crisp edges or flat areas of colour. Those same strengths make it a bad choice for photographs: with no detail discarded, a PNG photo is often several times larger than the equivalent JPG. Use PNG when edges must stay clean or you need a transparent background, but not for photos.

WebP: the modern all-rounder

WebP can do both jobs, lossy like JPG or lossless like PNG, and it supports transparency. At the same visual quality it is typically 25-35% smaller than JPG or PNG, which is a meaningful page-speed win. Support is now very wide across browsers, so for most websites WebP is an easy upgrade with a JPG or PNG fallback for the rare old client.

AVIF: the smallest files

AVIF is the newest of the four and usually wins on size, often beating WebP noticeably on photographs at the same quality, with transparency and wide colour support. The trade-offs are slower encoding and support that, while broad, is still a touch behind WebP. For image-heavy pages where every kilobyte counts, AVIF is worth the effort. Note that some tools, including our AVIF converter, focus on turning AVIF files into more common formats, which is handy when you receive an AVIF you need to edit elsewhere.

A simple decision flow

1. Need transparency or crisp edges? Start with PNG; use WebP or AVIF if you want it smaller.
2. Is it a photo? Use JPG for maximum compatibility, or WebP/AVIF for smaller files.
3. Chasing the smallest possible page weight? Prefer AVIF, then WebP, with a JPG/PNG fallback.

Whatever you choose, format is only half the story. Resizing and compressing matter just as much. See our guide on compressing images for the web for the full workflow. You can also try a format directly in the image converter and compare the output side by side.

Frequently asked questions

Which format is best for photographs?

For broad compatibility, JPG. For smaller files at the same quality, WebP or AVIF. All three use lossy compression that suits the smooth gradients in photos. PNG is a poor choice for photos because it stays large.

Which format should I use for a logo or icon?

PNG, because it is lossless and supports transparency, so sharp edges and flat colours stay crisp. For simple shapes, an SVG is even better, but among raster formats PNG is the safe pick for logos.

Is WebP or AVIF better?

AVIF usually produces smaller files than WebP at the same quality, especially for photos, but it can be slower to encode and is slightly less universally supported. WebP is a strong middle ground with wide support.

Does converting PNG to JPG lose quality?

Converting to JPG applies lossy compression, so there is some loss, though it is often invisible for photos. You also lose transparency, since JPG does not support it. Keep the PNG original in case you need it again.