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

You save the same screenshot twice — once as PNG, once as JPEG. The PNG is several times larger, but the text is razor sharp. The JPEG is small, and every letter has picked up a faint grey haze around it.

Neither format is broken. They were built to solve different problems, and picking the wrong one is the easiest way to end up with a page that is either bloated or blurry.

The 10-second version

If you remember nothing else from this article:

• Photograph? → JPEG, or WebP for the web.
• Logo, icon, screenshot, text, transparency? → PNG, or lossless WebP.
• Genuinely a vector logo or icon? → SVG.
• Publishing to the web and want the smallest file? → WebP.

The rest of this explains why, because the reasoning is what lets you handle the cases a list cannot cover.

JPEG: built for photographs

JPEG is a lossy format designed around how human vision works. It preserves brightness detail carefully and treats fine color variation as expendable, because our eyes are much less sensitive to it. It also compresses busy textures harder than flat areas, on the reasonable bet that you will not notice small errors inside foliage or gravel.

Strengths: extremely efficient on photographic content, supported literally everywhere, and adjustable — you can trade size against fidelity with a quality setting.

Limitations:

• No transparency. A JPEG always has a solid background. This is the single most common reason a logo ends up with an unwanted white box behind it.
• Poor with hard edges. Sharp boundaries between flat colors — text, UI chrome, line art — produce exactly the ringing and haze you saw in that screenshot.
• Lossy every single save. Re-encoding an existing JPEG compounds the damage.

Use it for photographs. Avoid it for anything with crisp graphic edges.

PNG: built for exactness

PNG is lossless. Whatever pixels go in come back out identical, no matter how many times you re-save. It also supports an alpha channel, meaning true per-pixel transparency — including soft, semi-transparent edges rather than a crude “this one color is invisible” trick.

Strengths: perfect fidelity, real transparency, and excellent compression on images made of large flat color areas and sharp edges. Which is to say: logos, icons, diagrams, screenshots, and line art.

The catch: PNG compresses by finding repetition, and a photograph has almost none. Save a photo as PNG and you get a very large file that looks identical to a much smaller JPEG. That is the classic mistake in the opposite direction.

Use it for graphics. Avoid it for photographs.

WebP: the modern default

WebP is the format that refuses to choose. It offers:

• a lossy mode, filling the JPEG role
• a lossless mode, filling the PNG role
• alpha transparency, available in both modes
• animation, filling the old GIF role

In practice a WebP is generally smaller than the equivalent JPEG or PNG at comparable visual quality. It is supported across all current mainstream browsers, so for a normal website it is a sensible default rather than a risky experiment.

Two things to watch. Some older desktop software and some third-party upload forms still expect JPEG or PNG specifically. And a non-technical recipient who downloads a .webp may not know what to do with it. Keep a JPEG or PNG copy for those hand-offs.

You can move between all three with the Image Converter, which runs locally in your browser rather than uploading anything.

What about AVIF?

AVIF is the newer contender, derived from video coding. At comparable quality it typically produces even smaller files than WebP, and it handles wide color and high dynamic range well.

Two honest caveats:

• Encoding is slower, sometimes noticeably, which matters if you are processing images in bulk or generating them on the fly.
• Support is good but still slightly behind WebP, and tooling outside the browser is patchier.

AVIF is a strong choice for a site with a build pipeline that can generate several formats and let the browser pick. For everyday one-off exports, WebP is the lower-friction answer.

And SVG, which people keep forgetting

If your logo or icon started life in vector software, the right answer is often none of the above. SVG stores shapes and paths instead of pixels, so it stays perfectly sharp at any size, is usually tiny for simple graphics, and can be recolored with CSS.

SVG is wrong for photographs and wrong for anything with complex texture. But if you find yourself exporting a company logo to PNG at three different sizes because it keeps looking soft, you probably wanted SVG all along.

Which should I pick?

• Product photo on a store page → WebP (lossy), with JPEG as a fallback if you need one.
• Logo with a transparent background → SVG if you have the vector; otherwise PNG or lossless WebP.
• Screenshot containing UI text → PNG or lossless WebP. Never JPEG.
• Photo emailed to a client who will open it in who-knows-what → JPEG. Compatibility wins.
• Short animated clip → animated WebP, or a real video file (MP4/WebM) once it runs past a couple of seconds.
• Favicon → SVG, plus PNG fallbacks in whatever sizes your framework asks for.
• Chart or diagram exported from a tool → SVG if offered, PNG if not.

Converting between them

Converting is easy. Converting back is not.

Converting a lossy JPEG to PNG cannot restore what the JPEG threw away. You end up with a lossless copy of a degraded image: a larger file containing exactly the same visible artifacts. PNG is a preservation format, not a repair tool.

Two directional gotchas

• JPEG → any format with transparency does not create transparency. There is no alpha information to recover, so you simply get an opaque image in a format that theoretically supports alpha.
• PNG → JPEG flattens transparency onto a background color, usually white. If the graphic was designed to sit on a dark page, this will look obviously wrong.

The safe rule mirrors the one for compression: keep the original and convert from that, not from a copy that has already been through a lossy round trip. When you do need the result smaller, the Image Compressor lets you compare quality settings against a live preview, and the Image Resizer handles dimensions first — usually the bigger saving anyway.

Quick answers

Is WebP safe to use now? Yes, for normal web use. All current mainstream browsers support it.

Why is my PNG photo so enormous? PNG is lossless and photographs contain almost no repetition to compress. Use JPEG or lossy WebP instead.

Why does my logo have a white box behind it? It was saved as JPEG, which has no transparency. Re-export from the original as PNG, WebP, or SVG.

Does converting JPEG to PNG improve quality? No. The discarded detail is gone for good; you just get a bigger file.

JPG or JPEG — is there a difference? None. Same format. The three-letter extension is a leftover from old filename limits.

The takeaway

JPEG is for photographs, PNG is for graphics and transparency, and WebP does both jobs in a smaller file — which makes it the sensible default for the web. Reach for SVG whenever the artwork is truly vector, keep AVIF in mind for pipelines that can afford the encoding time, and remember that no conversion can bring back quality a lossy save has already thrown away.