svag

An SVG minifier.

Features

• Remove XML declarations, DOCTYPE, comments
• Remove metadata, title, desc elements
• Remove Inkscape/Sodipodi namespaces and elements
• Remove unused namespace declarations
• Collapse unnecessary groups
• Remove hidden and empty elements
• Minify path data (reduce precision, implicit commands)
• Minify colors (#ff0000 → red, #ffffff → #fff)
• Remove default attribute values
• Minify inline styles
• Sort attributes for better gzip

Usage

As a library

use svag::minify;

let svg = r#"<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
    <!-- A red square -->
    <rect x="10" y="10" width="80" height="80" fill="#ff0000" fill-opacity="1"/>
</svg>"#;

let minified = minify(svg).unwrap();
// <svg xmlns="http://www.w3.org/2000/svg" height="100" width="100"><rect fill="red" height="80" width="80" x="10" y="10"/></svg>

As a CLI

# From stdin
echo '<svg>...</svg>' | svag

# From file
svag input.svg -o output.svg

# With stats
svag input.svg --stats
# 1961 -> 602 bytes (69.3% smaller)

With custom options

use svag::{minify_with_options, Options};

let options = Options {
    precision: 1,           // decimal places for coordinates
    remove_comments: true,
    minify_paths: true,
    minify_colors: true,
    ..Options::default()
};

let minified = minify_with_options(svg, &options).unwrap();

Installation

cargo add svag

Or for the CLI:

cargo install svag

Size comparison

Test corpus: tests/corpus/*.svg (3 files, 2.7 KB total)

| Total | 2.7 KB | 1.1 KB (-58.0%) | 1.0 KB (-61.5%) |

¹ svgo is a mature, battle-tested Node.js SVG optimizer. The size differences here are minor — svgo has more optimization passes. CLI timing comparisons wouldn't be fair since svgo pays Node.js startup cost; as a library it would perform much better.

To regenerate these benchmarks:

npm install svgo  # for comparison
cargo xtask readme

FAQ

Why "svag"?

Because it's swag.

Is it production-ready?

No, but the tests make me reasonably sure it won't mess anything up.

Roadmap

• More optimization passes (match svgo's output sizes)
• SVGO-compatible plugin system
• Streaming support for large files

Inspired by

• svgo - The OG SVG optimizer
• oxvg - Rust SVGO port

License

MIT OR Apache-2.0