compiler-explorer/public/logos

Logo Optimization Guidelines

This directory contains logos for programming languages displayed in Compiler Explorer. To maintain fast loading times and reasonable bundle sizes, logos should be optimized before adding them.

Size Guidelines

• Target size: Keep individual logos under 20KB when possible
• Maximum dimensions: 256×256 pixels (preserving aspect ratio)
• File formats: SVG preferred for simple graphics, PNG for complex images

Optimization Tools & Commands

PNG Images

# Resize and optimize (preserves aspect ratio)
convert input.png -resize 256x256> -quality 85 output.png

# Alternative with pngquant for better compression
pngquant --quality=65-80 --output output.png input.png

SVG Images

# Optimize with SVGO (install with: npm install -g svgo)
npx svgo input.svg --output output.svg

# For SVGs with embedded raster data, convert to PNG instead
convert input.svg -resize 256x256 -quality 85 output.png

Common Issues

• Embedded Base64 data in SVGs: These are usually very large (300KB+). Convert to PNG instead.
• Oversized PNGs: Images over 1000px wide/tall should be resized to 256×256 or smaller.
• 16-bit PNGs: Convert to 8-bit with convert input.png -depth 8 output.png

Recent Optimizations

Examples of successful optimizations:

• hylo.svg (321KB) → hylo.png (27KB) - 92% reduction
• nim.svg (126KB) → nim.png (13KB) - 90% reduction
• scala.png (79KB) → optimized (14KB) - 82% reduction

Always test that optimized logos look good at small icon sizes (16-32px) in the UI.