Advanced Image Optimization FAQ
Everything about compression strategy, modern formats and performance budgets for professional teams.
Is my image uploaded to a server?
No. All compression, conversion and resizing happens locally in your browser using WebAssembly. Your files never leave your device.
Which image formats are supported?
WebP, AVIF, JPEG, PNG, GIF, BMP and TIFF. You can convert between them and adjust quality parameters.
Will quality be reduced?
You choose the balance. The tool provides visually lossless defaults while letting you fine‑tune quality or use lossless modes for formats that support it.
What compression level should I start with?
Begin around quality 75–80 for JPEG/WebP, 45–55 for AVIF, then inspect visually. Lower further if artifacts are acceptable.
Should I serve AVIF and WebP together?
Yes, use content negotiation or build pipelines to provide AVIF → WebP → JPEG fallbacks for maximum reach & minimal bytes.
How do images impact Core Web Vitals?
Heavy images inflate LCP and CLS (if dimensions missing). Proper compression, modern formats, defined width/height and responsive sets reduce impact.
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