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Get Started Free →Use when reviewing image assets, markup, and CDN or build transforms related to Compress images without quality loss. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-05 | ✗→✓ | ▲ Improved | -56% | 0% |
| case-17 | ✗→✓ | ▲ Improved | -30% | 0% |
| case-22 | ✓→✓ | ＝ Same ✓ | -2% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | -26% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | -37% | 0% |
Uncompressed images are often 5-10x larger than needed—proper compression dramatically reduces page weight and load times with minimal visual impact.
Analyze if images are properly compressed without significant quality loss.
Compress images using tools like ImageOptim, TinyPNG, or automated build processes.
Explain how proper compression can reduce image sizes by 60-80% with minimal quality impact.
Review image assets, markup, and delivery configuration related to Compress images without quality loss. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/images/image-compression
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