PNG vs JPG: Which Image Format Should You Use?

PNG vs JPG: A Complete Format Guide

PNG and JPG (JPEG) are the two most common image formats on the web. Choosing the right one affects file size, image quality, and how well the image looks in different contexts. The short answer: use JPG for photos, PNG for graphics with transparency.

How Each Format Works

JPG uses lossy compression — it permanently discards some image data to achieve small file sizes. Every time you save a JPG, quality is lost slightly. It's designed for photographs with millions of colors and gradients.

PNG uses lossless compression — the original pixel data is perfectly preserved. PNG also supports an alpha (transparency) channel, which JPG does not. File sizes are larger than JPG for photographs, but better for sharp-edged graphics.

Comparison Table

Feature	JPG	PNG
Compression type	Lossy	Lossless
Transparency	No	Yes (alpha channel)
Best for	Photographs	Logos, screenshots, graphics
File size (photos)	Small	Large
File size (graphics)	Larger	Smaller
Re-saving quality loss	Yes	No
Browser support	Universal	Universal
Animation	No	No (use WebP/APNG)

Use JPG When

• The image is a photograph or has complex color gradients
• File size is critical and slight quality loss is acceptable
• The image will be displayed on a colored background (no transparency needed)
• Uploading hero images, product photos, or blog post images

Use PNG When

• The image needs a transparent or semi-transparent background (logos, icons)
• The image contains text, line art, or sharp edges that would look blurry in JPG
• You need pixel-perfect screenshots for documentation
• The image will be edited further — lossless means no generation loss

What About WebP?

WebP is a modern format developed by Google that supports both lossy and lossless compression, plus transparency. WebP files are typically 25–35% smaller than equivalent JPG/PNG files. All modern browsers support it. For new web projects, WebP is often the best choice for both photos and graphics.

File Size in Practice

A typical 2000×1500 photograph saved at JPG quality 80 is around 300–500 KB. The same image as PNG might be 3–5 MB — ten times larger. For a logo with transparency, a PNG might be 20 KB while a JPG (which can't show transparency) would look wrong on any non-white background.

Convert Between Formats

Need to switch formats? Use Utilko's free tools: PNG to JPG Converter and JPG to PNG Converter. Both work entirely in your browser with no upload required.