Merge styles (mergeStyles)
Combines multiple <style> elements and merges rules where possible before inlining or minifying.
What Merge styles does in SVGO
SVGO applies mergeStyles as part of its plugin pipeline. In SVGOMG the toggle is labeled Merge styles (enabled by default). Optimization runs entirely in your browser — files are not uploaded to a server.
Use the SVGOMG optimizer with Show original to compare before and after. If output looks wrong, disable this plugin first, then re-enable related transforms one at a time.
When to enable
SVGs with several style blocks from layered exports.
When to disable
When separate style blocks must stay isolated for cascade reasons.
Watch out for
Run before inlineStyles and minifyStyles.
Try it in SVGOMG
- Open svgomg.net and load your SVG (file, paste, or demo).
- Find Merge styles in the Features panel (
mergeStyles). - Toggle the plugin and compare the preview; download when satisfied.
SVGO Plugin Guide
Browse the SVGO Plugin Guide or read the full SVG optimization walkthrough on the homepage.