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

The three most common image formats on the web are JPG, PNG, and WebP. Each was designed for different purposes, and using the wrong one for your use case means either wasting bandwidth on unnecessarily large files or losing image quality unnecessarily. Understanding the differences helps you make the right choice every time.

JPG: Best for photographs

JPG (or JPEG) was designed in 1992 specifically for compressing photographic images. It uses lossy compression, which means it discards color information that the human eye is less sensitive to. At high quality settings (85–95), the visual difference from the original is barely perceptible.

Use JPG when:

• The image is a photograph with many color gradients
• You don't need transparency
• Maximum compatibility is required (JPG works everywhere)
• File size is more important than pixel-perfect accuracy

Avoid JPG when:

• The image has sharp edges, text, or flat blocks of color (JPG creates visible artifacts)
• You need a transparent background
• The image will be edited and saved multiple times (quality degrades each save)

PNG: Best for graphics with transparency

PNG uses lossless compression — it preserves every single pixel value exactly. This makes PNG perfect for logos, UI elements, icons, and screenshots where sharp edges and exact color reproduction are critical.

Use PNG when:

• You need transparency (alpha channel)
• The image has text, sharp edges, or flat colors
• You need pixel-perfect accuracy (logos, UI graphics)
• The image will be used as a source file for future edits

Avoid PNG when:

• The image is a photograph (PNG files for photos are much larger than JPG)
• File size is a priority (PNG is the largest format of the three for most images)

WebP: Best for web delivery

WebP was developed by Google in 2010 specifically for web use. It supports both lossy and lossless compression, supports transparency like PNG, and achieves smaller files than both JPG and PNG at comparable quality.

Use WebP when:

• Images are for web or app delivery
• You want smaller files than JPG (photos) or PNG (graphics)
• You need transparency but also want small file sizes
• You're targeting modern browsers (all major browsers have supported WebP since 2020)

Consider avoiding WebP when:

• You need compatibility with very old browsers or software
• The file will be used in print production
• The receiving platform specifically requires JPG or PNG

Side-by-side comparison

• File size for a typical photograph (1200×800px): JPG ~150KB, PNG ~1.5MB, WebP ~100KB
• File size for a logo with transparency (400×400px): PNG ~20KB, WebP ~14KB, JPG doesn't support transparency
• Quality at same compression ratio: WebP ≥ JPG for photos; WebP ≥ PNG for graphics
• Browser support: JPG = 100%, PNG = 100%, WebP = 98%+

The practical recommendation

For web images in 2026: use WebP. It's smaller than both alternatives, supports transparency, and is supported in all modern browsers. Use PNG for assets that must be editable source files or that require maximum compatibility. Use JPG when a specific system requires it or when you need the absolute widest compatibility including very old systems.

Resizo lets you convert between all three formats easily. Drop your image, pick the target format, and download the result.