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

Four formats dominate images today: PNG, JPEG, WebP, and AVIF. Each makes a different trade-off between file size, quality, transparency, and compatibility — and picking the wrong one can make a file ten times bigger than it needs to be, or quietly blur a crisp logo. Here’s how they differ and how to choose in seconds.

What actually separates image formats

Under the hood, every format answers three questions differently. First: how does it compress?Lossless formats (PNG) keep every pixel exactly as it was, so files are perfect but large. Lossy formats (JPEG, and usually WebP and AVIF) throw away detail your eye is unlikely to notice, which is how a 5 MB photo becomes 500 KB.

Second: what features does it support?Transparency (an alpha channel) is essential for logos and icons that sit on colored backgrounds. JPEG simply can’t do it; PNG, WebP, and AVIF can.

Third: where does it open? PNG and JPEG open everywhere — every browser, every OS, every app since the 1990s. WebP and AVIF are newer, and while all modern browsers now display both, some desktop software, older email clients, and upload forms still reject them.

To make the trade-offs concrete: take one detailed 1920×1080 photo and save it four ways. As a PNG it might land around 4 MB, as a quality-80 JPEG a few hundred kilobytes, as a WebP noticeably less than the JPEG, and as an AVIF less still. Exact numbers vary with content, but the ordering is remarkably consistent for photographs — and it flips for flat graphics, where PNG often wins outright.

PNG: lossless and precise

PNG stores pixels losslessly, so text stays razor sharp, flat colors stay flat, and you can re-save a PNG a hundred times without degradation. It also supports full transparency, which is why it’s the default for logos, icons, and UI assets.

The catch is photographs. Real-world photos are full of subtle noise that lossless compression can’t simplify, so a photo saved as PNG is often 5–10× larger than the same photo as a JPEG — with no visible benefit. Use PNG for screenshots, diagrams, logos, and anything with sharp edges or transparency; avoid it for photos.

JPEG: the universal photo format

JPEG has been the workhorse of photography since 1992. Its lossy compression is tuned for the smooth gradients of real-world scenes, and a quality setting (usually 0–100) lets you trade size against fidelity. At quality 80–85, most photos look indistinguishable from the original at a fraction of the size.

JPEG’s weaknesses are the mirror image of PNG’s: no transparency, and visible “ringing” artifacts around sharp edges like text or line art. Its superpower is compatibility — if a form, printer, or ancient app needs an image, JPEG works. If you have iPhone photos in HEIC that something refuses to accept, converting with a HEIC to JPG converter is the standard fix.

WebP: the modern all-rounder

WebP, introduced by Google, does almost everything: lossy and lossless modes, transparency, even animation. In lossy mode it’s typically 25–35% smaller than a JPEG of comparable visual quality, and its lossless mode usually beats PNG too. Every modern browser has supported it since Safari added it in 2020.

The friction is outside the browser: some image editors, older tools, and picky upload forms still don’t accept it. That’s why “convert WebP to PNG” is one of the most common conversion tasks — if a site hands you a .webpyou can’t use, a WebP to PNG converter solves it in your browser without uploading anything.

AVIF: the newest and smallest

AVIF is built on the AV1 video codec and generally produces the smallest files of the four, especially at aggressive compression levels where JPEG falls apart. It supports transparency, animation, wide color gamut, and HDR. All current major browsers display it.

Trade-offs: encoding is slower than the others, very high-quality settings don’t always beat WebP by much, and support outside browsers (desktop apps, upload forms, older devices) is the patchiest of the four. AVIF is superb as a deliveryformat for websites, but it’s not yet the safest format for sharing files with other people.

Side-by-side comparison

Which format should you use?

What about GIF, HEIC, and SVG?

Three formats you’ll still meet deserve a footnote. GIF survives purely for simple animations; for static images its 256-color limit makes it obsolete — use PNG or WebP. HEIC is what iPhones shoot by default: efficient, but poorly supported outside Apple’s ecosystem, so it usually gets converted to JPEG before sharing. SVG isn’t a pixel format at all — it’s vector math, ideal for logos and icons that must stay sharp at any size, and it only becomes PNG or JPEG when rasterized.

The short answers

• Photos you’ll share or upload: JPEG at quality 80–85. It works everywhere and looks great.
• Logos, icons, screenshots, anything with text: PNG. Lossless edges and transparency matter more than file size here.
• Images on your own website: WebP or AVIF, ideally with a JPEG/PNG fallback. A website image optimizer can generate the modern formats, responsive sizes, and markup in one pass.
• A file that must be small but still open anywhere: JPEG, then compress it. An in-browser image compressor lets you compare quality side by side before downloading.

And when you’re handed the wrong format for the job — a WebP a form won’t take, a PNG photo that’s 20 MB — switching is a ten-second job with an image converterthat runs entirely on your device. Format choice isn’t a commitment; it’s just the right tool for each moment.