No. This is the browser encoder (quality 0.1–1). For expert WebP, MozJPEG or AVIF, Squoosh is the reference.

No. JPEG, PNG, WebP, sometimes AVIF/BMP. Animated GIF and SVG are out.

Is anything sent to a server?

No. The image is read and re-encoded in the tab.

(01) — TOOLS

Lighter images.

Cap the long edge, pick WebP or JPEG, set quality. The file stays in the tab. This is the browser canvas, not a full Squoosh.

(02) — METHOD

01 — Size

The long edge is capped (800, 1280, 1920 px, or unchanged). No upscaling.

02 — Format

WebP is usually lightest. JPEG for compatibility. PNG often ignores quality (lossless).

03 — Local

canvas.toBlob in the browser. Nothing is posted. Download the result.

(03) — FAQ

As good as Squoosh?: No. This is the browser encoder (quality 0.1–1). For expert WebP, MozJPEG or AVIF, Squoosh is the reference.
GIF, SVG, HEIC?: No. JPEG, PNG, WebP, sometimes AVIF/BMP. Animated GIF and SVG are out.
Is anything sent to a server?: No. The image is read and re-encoded in the tab.