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

How each format compresses

JPG (also written JPEG) uses lossy compression: it permanently discards image data the human eye is least likely to notice, then reconstructs an approximation when the file is opened. That approach is extremely effective on photographs, where smooth gradients of color hide the loss, but it introduces faint block-shaped artifacts around sharp edges and text. Every time a JPG is re-saved it is re-compressed, so quality degrades a little further with each edit.

PNG is lossless — it stores every pixel exactly and reconstructs the image bit-for-bit, no matter how many times you re-save it. It also supports a full 8-bit alpha channel, meaning smooth, variable transparency (a logo can fade to fully see-through at its edges). The cost of that fidelity is size: a photograph saved as PNG is typically 3–10× larger than the same photo as JPG.

WebP is the modern option and supports both modes. In lossy mode it targets the same photographic content as JPG but is usually 25–35% smaller at matching visual quality; in lossless mode it competes with PNG while producing files roughly 20–30% smaller. Critically, WebP keeps an alpha channel in both modes, so you get transparency and small files at the same time — something neither JPG nor traditional PNG can offer.

File-size expectations

For a typical 12-megapixel photo, expect rough ballparks of 3–6 MB as a high-quality JPG, 15–30 MB as a PNG, and 2–4 MB as a quality-80 WebP. The numbers shift with content — a flat-color graphic compresses far smaller than a detailed landscape — but the ranking (WebP ≤ JPG ≪ PNG for photos) holds consistently for photographic material.

The picture flips for graphics with large flat areas and few colors, such as logos, icons, and simple diagrams. Here PNG's lossless compression is efficient and a small PNG can rival or beat a JPG, while JPG actively hurts by smearing crisp edges. WebP's lossless mode still edges out PNG on size, which is why it has become the default for UI assets on performance-focused sites.

When to use which

Photographs and any rich, continuous-tone image: reach for JPG or lossy WebP. JPG remains the safe, universally accepted choice for sharing, printing, and email; WebP is the better pick when the destination is a web page and you control the markup, because the smaller file loads faster.

Logos, icons, line art, and screenshots: use PNG or lossless WebP. These images have hard edges and text that JPG's lossy compression visibly damages, and many need transparency, which JPG cannot store at all. A UI screenshot saved as JPG looks noticeably fuzzy around text; the same screenshot as PNG stays razor-sharp.

Web performance specifically: default to WebP and keep a JPG or PNG fallback only if you must support very old software. WebP typically cuts image payload — often the largest part of a page — by a quarter or more, which directly improves load time and Largest Contentful Paint. When you convert, do it locally: our image converter runs entirely in your browser, so your originals are never uploaded to a server.

Compatibility

JPG and PNG are supported by essentially everything ever built — every browser, operating system, editor, and printer. If you need an image to open no matter what, these two are the safest formats, which is why they remain the lingua franca of image sharing.

WebP is supported by every current browser (Chrome, Edge, Firefox, Safari 14+, and all modern mobile browsers) and by most up-to-date design tools. The gaps you may still hit are older desktop applications, some corporate systems on legacy software, and a few platforms that reject WebP uploads. When you encounter one, converting WebP back to PNG or JPG takes seconds and loses nothing that matters.

Conversion advice

Convert with intent, not by habit. Converting a JPG to PNG will not restore detail the JPG already discarded — it only prevents further loss, which is useful before editing but wasteful if you are just archiving. Converting a PNG photo to JPG or WebP, by contrast, delivers a large, real size reduction. Match the target format to what the image actually needs.

When lossy conversion is involved, control quality rather than accepting a default. A quality setting around 75–85 is visually transparent for most photos while cutting size dramatically; pushing below 60 starts to show. Because our converter and compressor process files client-side, you can iterate freely — trying different formats and quality levels — without any file ever leaving your device.

Frequently asked questions