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

Every image on the web is stored in a specific format, and choosing the right one for each use case makes a measurable difference in file size, loading speed, and visual quality. Using PNG for photographs quadruples file sizes for no quality benefit. Using JPEG for logos and diagrams introduces visible compression artifacts. Using outdated formats instead of WebP leaves page performance on the table.

This guide covers the five formats you actually need to understand: JPEG, PNG, WebP, GIF, and SVG.

JPEG (Joint Photographic Experts Group)

File extensions: .jpg, .jpeg

JPEG is the dominant format for photographs and complex images with smooth color gradients. It uses lossy compression, meaning it discards some image data to reduce file size. The amount of data discarded is controlled by a quality setting, typically on a scale of 0-100.

When to use JPEG

• Photographs and realistic images
• Images with complex color gradients and smooth tonal transitions
• Any image where small visual imperfections are acceptable
• Large hero images and product photos on websites

When NOT to use JPEG

• Images with text, sharp edges, or line art (compression creates visible artifacts)
• Logos and icons
• Images that need a transparent background
• Images you will edit and resave multiple times (each save compounds quality loss)

Key characteristics

Pros: Excellent compression for photographs, universally supported, small file sizes at reasonable quality settings

Cons: Lossy compression causes visible artifacts at high compression rates, no transparency support, degrades with repeated editing

Typical use case file size: A 1200x800 photograph might be 150-400 KB as JPEG at quality 80

PNG (Portable Network Graphics)

File extension: .png

PNG uses lossless compression, meaning no image data is ever discarded. What you put in is exactly what comes out. This makes PNG the right format when image quality must be preserved perfectly.

When to use PNG

• Screenshots and screen captures
• Logos, icons, and graphics with text
• Images with transparency (PNG supports full alpha channel)
• Diagrams, infographics, and illustrations with sharp edges
• Images that will be edited and resaved multiple times

When NOT to use PNG

• Photographs (files are much larger than JPEG with no visible quality difference)
• Any image where file size is a concern and transparency is not needed

Key characteristics

Pros: Lossless compression, transparency support, sharp edges preserved perfectly, safe for repeated editing

Cons: Much larger file sizes than JPEG for photographs, not suitable for large photographic images

Typical use case file size: The same 1200x800 photograph that is 300 KB as JPEG might be 2-4 MB as PNG

WebP

File extension: .webp

WebP was developed by Google and is now supported by all major browsers. It supports both lossy and lossless compression, and typically produces files 25-35% smaller than JPEG or PNG at equivalent quality.

When to use WebP

• Replacing JPEG for photographs (smaller files, similar quality)
• Replacing PNG for transparency images (better compression than PNG)
• Any image on a website where performance matters and broad browser support is acceptable
• Primary format for web-optimized images

When NOT to use WebP

• When compatibility with older browsers or software is required
• Print workflows (most print software does not support WebP)
• When the receiving system cannot handle WebP files

Key characteristics

Pros: Smaller file sizes than both JPEG and PNG, supports transparency, supports both lossy and lossless modes, excellent browser support (Chrome, Firefox, Safari, Edge)

Cons: Less universal support in image editing software, not supported by very old browsers

Practical recommendation: Use WebP as your primary web image format. Keep a JPEG or PNG original for editing purposes.

GIF (Graphics Interchange Format)

File extension: .gif

GIF is a lossless format limited to 256 colors. Its main distinguishing feature is animation support, which is why it remains in use despite being a technically inferior format in almost every other way.

When to use GIF

• Simple animations
• Images with very few colors (logos on a white background with limited palette)
• Legacy contexts where animation is needed but video is not appropriate

When NOT to use GIF

• Photographs (256-color limit produces terrible results)
• Complex animations with many colors (use video instead)
• Static images where PNG or WebP would produce smaller files

Key characteristics

Pros: Animation support, universally supported, lossless within the 256-color limitation

Cons: 256-color maximum (terrible for photographs), large file sizes for animations, largely superseded by WebP and MP4 for animation use cases

SVG (Scalable Vector Graphics)

File extension: .svg

SVG is fundamentally different from the other formats. It is a vector format that stores images as mathematical descriptions of shapes, curves, and paths rather than as a grid of pixels. This means SVG images scale to any size without any quality loss.

When to use SVG

• Logos and brand assets
• Icons and UI elements
• Charts, diagrams, and infographics
• Any graphic that needs to scale perfectly at multiple sizes
• Animated graphics (SVG supports CSS and JavaScript animation)

When NOT to use SVG

• Photographs and realistic images (cannot be represented as vectors meaningfully)
• Complex images with many detailed elements (SVG file size grows with complexity)

Key characteristics

Pros: Infinite scalability without quality loss, small file sizes for simple graphics, can be styled and animated with CSS, accessible (text in SVG is readable by screen readers)

Cons: Not appropriate for photographs, complex SVGs can have larger file sizes than raster alternatives

Format Selection Quick Reference

Converting Between Formats

Converting an image from one format to another is straightforward. The key principle: always convert from a high-quality original, not from a previously compressed version. If you need a WebP version of a JPEG photograph, ideally start from the original uncompressed file to avoid compounding compression artifacts.