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

Choosing an image format seems trivial until a logo looks blurry, a photo balloons to 4 MB, or a transparent background turns into an ugly white box. PNG, JPG, and WebP each compress images in a fundamentally different way, and the right choice depends entirely on what's in the picture. This guide explains how each works and gives you a simple rule for every situation.

How each format compresses

JPG (JPEG) uses lossy compression: it discards visual detail the eye is least likely to miss, trading some fidelity for much smaller files. PNG is lossless: it stores the image exactly, using efficient encoding rather than throwing anything away, which keeps quality perfect but files larger. WebP is a modern format that can operate in either lossy or lossless mode, and in both it typically produces smaller files than the older format it's competing with — often 25–35% smaller at similar quality.

When JPG is the right call

Reach for JPG whenever the image is a photograph or anything with smooth gradients and lots of colors — landscapes, portraits, product shots. Lossy compression shines on this kind of content because small imperfections vanish into the detail. The one thing to avoid is repeatedly editing and re-saving a JPG: each save compresses again and degrades quality further, a effect called generation loss. Keep an original, and export a JPG only as the final step.

When PNG is the right call

PNG is built for graphics with sharp edges and flat color: logos, icons, screenshots, diagrams, and anything with text. On these images JPG's lossy compression creates visible "artifacts" — fuzzy halos around crisp lines — while PNG keeps every edge clean. PNG also supports full transparency, so it's the format for a logo that needs to sit on any background. The trade-off is size: a photograph saved as PNG can be several times larger than the same image as JPG.

Why WebP is often the best of both

WebP was designed to replace both older formats on the web. Its lossy mode competes with JPG at smaller sizes; its lossless mode competes with PNG, again usually smaller; and it supports transparency and animation. Browser support is now universal across every current major browser, so the old reason to avoid it has mostly disappeared. For a website where page speed matters, converting images to WebP is one of the highest-impact, lowest-effort optimizations available.

Transparency and animation

If you need a transparent background, your options are PNG or WebP — JPG has no transparency at all and will fill it with a solid color. For animation, the old choice was GIF, which is limited to 256 colors and produces large files; animated WebP handles full color at a fraction of the size. Unless you specifically need GIF's universal compatibility in very old environments, WebP is the better modern choice for short looping animations.

A practical workflow

Keep a high-quality master (often PNG or the original camera file), then export a delivery format for each use. For the web: WebP first, with a JPG or PNG fallback if you must support a niche old client. For photos going to a service that doesn't accept WebP: JPG. For logos and graphics that need transparency where WebP isn't accepted: PNG. Because format conversion is lossless-to-lossy in one direction only, always convert from your best-quality source rather than from an already-compressed file.

What compression artifacts look like

When JPG compresses too aggressively, it produces visible flaws called artifacts: blocky patches in smooth areas, and fuzzy "mosquito noise" halos around sharp edges and text. These are the fingerprints of lossy compression discarding too much detail. PNG and lossless WebP never show them because they don't throw data away. Recognizing artifacts helps you diagnose a bad-looking image — if a screenshot of text looks smeared, it was almost certainly saved as a low-quality JPG when it should have been a PNG.

Choosing a quality setting

Lossy formats let you pick a quality level, usually 0–100. The relationship isn't linear: dropping from 100 to about 80 often cuts file size dramatically while looking nearly identical, whereas going below 60 starts to show. A practical approach is to export at 80, view the result at full size, and only lower it if the file must be smaller and the image can tolerate it. Photographs hide compression well and can go lower; images with fine detail, text, or flat color need a higher setting or a lossless format instead.

File size, page speed, and SEO

Images are usually the heaviest part of a web page, so format choice directly affects load time — and load time affects both user experience and search ranking. Google's Core Web Vitals reward pages that render quickly, and oversized images are the most common cause of a slow one. Serving a right-sized WebP instead of a huge PNG can shave hundreds of kilobytes off a page. The rule that follows: resize an image to the dimensions it's actually displayed at, then compress it, then choose the smallest format that keeps it looking right.

Other formats worth knowing

Three more formats round out the picture. SVG is a vector format — it stores shapes as math, so logos and icons scale to any size without blurring and stay tiny; it's ideal for graphics but can't hold photographs. GIF survives only for legacy animation and simple graphics, limited to 256 colors. AVIF is a newer format that can beat even WebP on compression, with growing but not yet universal support. For most sites today, the practical trio is SVG for icons, WebP for photos and graphics, and a JPG or PNG fallback where needed.

Converting without losing quality

The golden rule of conversion: always start from the highest-quality source you have. Converting a compressed JPG to PNG won't restore lost detail — it just wraps the existing flaws in a bigger file. Converting from an original or a lossless master, on the other hand, gives the new format the best possible input. Because quality lost to lossy compression can never be recovered, keep an untouched master and export delivery copies from it, rather than editing and re-exporting the same lossy file repeatedly.