JPG vs PNG: Which Image Format Should You Use?

JPG vs PNG at a glance

The short version: JPG is a lossy format built for photographs, producing small files at the cost of some detail. PNG is a lossless format built for graphics and transparency, producing larger files that preserve every pixel exactly. Neither is universally "better" — the right choice depends entirely on what the image contains and how it'll be used.

What is JPG?

JPG (or JPEG) compresses images by discarding data the eye is unlikely to notice, especially in areas with smooth, gradual color transitions. That makes it extremely efficient for photographs, which are full of exactly this kind of gradual variation, but far less efficient for flat-color graphics or sharp text.

What is PNG?

PNG compresses losslessly — it shrinks the file without discarding any pixel data, and it supports transparency (an alpha channel), which JPG does not. It excels at flat colors, sharp edges, and text, which is why logos, icons, and screenshots are almost always PNG rather than JPG.

File size comparison

For a typical photograph, JPG will produce a dramatically smaller file than PNG — often 5-10x smaller at a quality setting most people can't distinguish from the original. For simple graphics with large flat-color areas (logos, icons, diagrams), the gap narrows and PNG can sometimes even come out smaller.

Quality comparison

JPG at a sensible quality setting (75-85%) is visually indistinguishable from the original for most photos. PNG is always visually identical to the source, by definition, since it discards nothing — the trade-off is file size, not quality.

When to use JPG

- Photographs and photo-realistic images - Web images where file size and load speed matter - Situations where transparency isn't needed

When to use PNG

- Logos, icons, and illustrations with flat colors or sharp edges - Screenshots, especially ones containing text - Any image that needs a transparent background

Website use cases

For a typical website: product and blog photos should be JPG or WebP for speed, while logos, icons, and UI graphics should be PNG (or SVG, where applicable) to keep edges crisp and backgrounds transparent.

Conversion and optimization

Converting between formats is straightforward, but keep the direction in mind — converting a JPG to PNG doesn't recover any detail already lost to compression, and converting a photographic PNG to JPG can shrink it substantially with little visible difference.

FAQ

Is PNG always higher quality than JPG? PNG is always lossless, so technically yes — but at a sensible JPG quality setting, most people can't actually see the difference in a photograph, while the PNG file will be considerably larger.

Why do logos and screenshots look bad as JPG? JPG's compression targets photographic detail and handles sharp edges and flat colors poorly, often introducing visible blur or artifacts around text and hard edges — exactly what PNG preserves perfectly.

Should I use WebP instead of both? For most modern web use, WebP is a strong alternative — it supports both lossy and lossless modes plus transparency, generally beating both JPG and PNG on file size at equivalent quality.