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

There are over a hundred image file formats in existence. You'll almost certainly only ever use four of them: JPG, PNG, WebP, and AVIF. The other ninety-six are either too obscure, too specialized, or too dead to matter for everyday use.

The question is which of these four to pick, and the honest answer is that it depends on what you're doing. There's no universal best format. There's a format that fits your situation, and three that don't. This guide will help you figure out which is which.

I'll cover what each format is good at, what it's bad at, and the specific situations where I'd reach for each one. If you just want a quick answer for a common situation, jump to the cheat sheet at the bottom.

The Quick Version

JPG is for photos. PNG is for graphics that need transparency. WebP is for photos and graphics on a website where file size matters. AVIF is the new contender that's better than all three, but support is still catching up.

That's the summary. If you want to know why, read on.

JPG: The Old Workhorse

JPG, sometimes written JPEG, has been around since 1992. That's older than most of the people reading this article. The fact that it's still everywhere tells you something about how good the original design was.

The format is built around a clever trick: human eyes are bad at noticing certain kinds of detail, particularly subtle color shifts in busy areas of an image. JPG exploits this by aggressively throwing away the data your brain wouldn't have processed anyway. The result is files that are dramatically smaller than the raw pixel data, with a quality loss that's mostly invisible.

JPG works brilliantly for photographs. The format was designed for them. A 12-megapixel iPhone photo that would be over 30MB as uncompressed pixel data becomes a 3MB JPG with quality so good you can't see the difference without zooming way in.

JPG falls apart for graphics with hard edges. Try saving a screenshot of text as JPG and look closely. You'll see weird halos around the letters, smudgy artifacts where colors meet, and a general softening of crisp edges. This is because the same trick that works for photos creates visible damage when applied to graphics. If your image has solid blocks of color, sharp lines, or text, JPG will mangle them.

JPG also can't do transparency. The format doesn't support it at all. If you save a transparent PNG as JPG, the transparent areas become white. This single limitation rules out JPG for a huge category of use cases, particularly anything involving logos, icons, or graphics that need to sit on a colored background.

Use JPG for: Photos of people, landscapes, food, anything captured by a camera. Especially when file size matters more than absolute quality. The default format for digital photos.

Don't use JPG for: Screenshots, logos, icons, graphics with text, anything needing transparency, anything you'll edit and re-save multiple times. Each save round damages quality a little more, and the damage accumulates.

PNG: The Graphics Format

PNG was created in 1996 as a free alternative to the GIF format, which at the time was tangled in patent disputes. PNG is fundamentally different from JPG. Where JPG throws away data to save space, PNG keeps every pixel exactly as it was, then compresses the result losslessly.

This makes PNG much larger than JPG for photographs. A photo that's 3MB as JPG might be 15MB as PNG. The quality is technically perfect, but you can't see the difference, and you paid five times the file size for invisible quality.

PNG is unbeatable for graphics with sharp edges or text. Screenshots, logos, illustrations with flat colors, app icons, anything where pixel-perfect crispness matters. Because PNG doesn't damage the image during compression, those crisp edges stay crisp.

PNG also supports transparency, including partial transparency. A drop shadow that fades from dark to invisible, a logo that needs to sit on any background color, a sticker with a soft edge — these all need PNG. JPG can't do any of them.

There's one weird thing about PNG worth knowing: there are multiple PNG types, and most software calls them all "PNG." The most common is PNG-24, which supports millions of colors and is what you usually get. PNG-8 is a smaller format limited to 256 colors, useful for very simple graphics. PNG-32 is PNG-24 plus an alpha channel for transparency. Most modern software just picks the right one automatically, but if you ever see "PNG-8" as an option in an export dialog, that's why.

Use PNG for: Screenshots, logos, icons, illustrations with flat colors, anything needing transparency, app graphics, charts and diagrams, anything you'll edit multiple times.

Don't use PNG for: Photographs (the file size is wasteful), anything you're putting on a website where every kilobyte counts.

WebP: The Modern Replacement

WebP was developed by Google and released in 2010. The pitch is simple: it does everything JPG and PNG do, but better. Smaller file sizes than JPG at the same visual quality. Lossless compression like PNG. Transparency like PNG. Animation like GIF. One format to replace several.

In practice, WebP delivers on this promise. A WebP version of a typical JPG photo is about 25 to 35 percent smaller at equivalent quality. For a PNG screenshot, the savings can be even bigger, sometimes 50 percent or more. For a website serving millions of images, this adds up to real bandwidth savings and faster page loads.

The reason WebP didn't replace JPG and PNG immediately is that for years, only Chrome could display it. Firefox finally added support in 2019. Safari held out until 2020. Internet Explorer never supported it, but Internet Explorer is mostly dead now anyway. As of 2026, every browser anyone uses supports WebP natively, which is why you're starting to see it everywhere.

The catch with WebP is that it's primarily a web format. Many desktop applications still don't know what to do with it. If you save a meme as WebP and try to share it with your aunt via email, there's a real chance her email client will show it as a broken attachment. This is improving rapidly, but it's still a real friction point in 2026. This is also exactly why we built a WebP to JPG converter — to handle exactly this gap.

Use WebP for: Images on your own website where you control the deployment. Images for apps where you know the platform supports it. Any situation where saving bandwidth matters and the audience is technical.

Don't use WebP for: Images you're emailing to non-technical people, images you're uploading to old platforms that haven't been updated since 2018, images going into print workflows, anything where compatibility matters more than file size.

AVIF: The New Contender

AVIF is the youngest format on this list, finalized in 2019 and only really becoming usable in browsers around 2021. It's based on the same compression technology as AV1, a video codec, and it's genuinely impressive.

AVIF files are typically 30 to 50 percent smaller than equivalent WebP files. Compared to JPG, the savings can be 60 percent or more at the same quality. For a website operator, that's potentially a massive reduction in bandwidth costs and page load times. For a user on a slow connection, it's the difference between a page that loads instantly and a page that takes ten seconds.

The format also handles high dynamic range images, wide color gamuts, and 12-bit color depth — things that matter for professional photography and HDR displays, even if most casual users have never heard of them.

The downside is compatibility. AVIF works in Chrome, Firefox, Safari, and Edge in their current versions, but a meaningful percentage of users are still on older browsers that don't. AVIF support in image editing software is even spottier. Photoshop added it relatively late. Many cheaper tools still don't have it. If you save your only copy of a photo as AVIF, you might find yourself unable to open it in three years on a different computer.

Encoding AVIF is also genuinely slow. Generating an AVIF file from a JPG can take several seconds where a WebP conversion takes less than one. For a website with thousands of images, this matters.

Use AVIF for: Production websites where you can serve multiple formats based on browser support (modern web frameworks make this easy). Maximum quality photography where file size and storage cost both matter. Future-proofing high-value photo archives.

Don't use AVIF for: Anything you're sharing with non-technical people directly. Anything you need to open or edit on a wide range of devices. Anything where conversion speed matters.

What About GIF and BMP?

You might notice I haven't mentioned GIF or BMP. They're both old formats that still exist but shouldn't be your first choice anymore.

GIF made sense in 1995. In 2026, it's a worse version of every other format. Worse compression than JPG for photos. Worse transparency than PNG. Limited to 256 colors. The only thing GIF still does well is animation, and even that's better handled by WebP, MP4, or modern animated WebP. If you have animated GIFs you want to convert to something better, you can make GIFs from photos for legacy compatibility, but modern alternatives are almost always better for new content.

BMP is even worse. It's an ancient Microsoft format that stores images with essentially no compression. A BMP file is just raw pixel data with a header. Modern operating systems can read it for backwards compatibility, but you shouldn't ever create new BMP files. PNG does the same job at a fraction of the size.

The Cheat Sheet

If you just want a quick decision rule:

• Taking a photo? JPG or HEIC (if your phone defaults to it).
• Making a screenshot? PNG.
• Putting an image on your website? WebP if you control the deployment, AVIF if you can serve multiple formats with fallback.
• Sending an image to someone who's not technical? JPG for photos, PNG for graphics. Don't surprise people with formats they don't recognize.
• Making a logo or icon? PNG, or SVG if it's vector and your audience supports it.
• Archiving important photos long-term? JPG at maximum quality. The format will still work in 50 years. AVIF might not.
• Need a favicon for your website? ICO for traditional support, PNG for modern browsers, or convert a PNG to ICO to cover both.

A Few Common Misconceptions

"PNG is always higher quality than JPG." Sort of. PNG is lossless, which means it doesn't damage the image during compression. But "lossless" doesn't mean "high quality" — it means "preserves whatever quality the original had." If your source image is already a low-quality JPG, saving it as PNG just makes a larger file with the same low quality. The damage was already done.

"WebP isn't supported everywhere." This used to be true and gets repeated as if it still is. In 2026, every browser supports WebP. The remaining compatibility issues are with desktop software and email clients, not browsers.

"You should always use the newest format." No. The right format depends on who's going to open the file. AVIF is technically superior, but if you send an AVIF to your grandmother, she might not be able to open it. JPG is technically inferior, but it works everywhere on earth for the last 30 years. Reach for the format that matches your audience.

"Higher resolution means higher quality." Resolution and quality are different things. A 4000x3000 pixel JPG saved at low quality can look worse than a 1000x750 pixel JPG saved at high quality. The format and quality setting matter as much as the dimensions.

The Practical Conclusion

Pick the format that matches your situation. JPG for camera photos. PNG for graphics and screenshots. WebP for web deployment. AVIF for cutting-edge web optimization. Convert between them as needed for the audience you're sending to.

The good news is that converting between these formats is fast and easy, and doesn't damage the image as long as you're not going through JPG repeatedly. You can take a screenshot as PNG, convert it to WebP for your website, then convert that same source PNG to JPG to email to your dad, and all three versions will look fine in their respective contexts.

If you ever need to convert between any of these formats, that's exactly what we built zamaz.ing for. Everything runs in your browser, no upload, no signup. But honestly, the more important takeaway is just understanding which format does what. Once you know that, the rest is mechanical.