Create Transparent WebP

Mostly as infrastructure: a placeholder src for lazy-loaded images so the layout reserves space without a network request, a spacer in HTML emails or legacy layouts, a default avatar slot before user content loads, and a known-good test asset when you are debugging whether a pipeline (CDN, resizer, cache) preserves WebP alpha channels. Because the file is a few hundred bytes, it costs essentially nothing to inline as base64.

The banner at the top tells you. ✓ WebP if your browser can encode it (Chrome / Firefox / Edge / Opera / Safari 14+, ~99% of browsers in 2026). ⚠ PNG fallback otherwise. If PNG fallback kicks in, the toast tells you and the filename ends in .png.

Measured, not invented: the stats line shows both byte counts for your specific image and calculates the actual % saving. For typical blank 1920×1080 transparent files: WebP is ~70 bytes, PNG is ~200 bytes – that’s ~65% smaller. But savings can vary wildly.

Both PNG and WebP excel at compressing uniform regions. A fully-transparent image has zero color variation – every pixel is the same (alpha = 0). The encoder needs ~50-200 bytes of header + “the whole image is one alpha value” payload, regardless of dimensions. Raw uncompressed 1920×1080 RGBA pixel data is 8.3 MB; compressed it’s 70 bytes.

WebP quality controls how much detail is preserved when compressing. A blank image has no detail – every pixel is identical. The encoder uses the same minimal bytes whether quality is 0.1 or 1.0. Saves you maybe 5-10 bytes total. The slider is included for compatibility with the encoding pipeline; for blank images it’s basically cosmetic.

8192 × 8192. Most browsers fail past ~16k × 16k, and mobile Safari often fails earlier. 8192 works everywhere as of 2026.

This tool defaults to WebP output (with PNG fallback for unsupported browsers). The other tool defaults to PNG with optional WebP. Same underlying algorithm; different defaults to match the WEBP-category emphasis.

No. The checkered pattern is a UI hint in this tool (and Photoshop, image viewers) to visualize transparency. The actual file has no pattern – it’s truly invisible. Open the downloaded file in any image viewer to confirm: you’ll see nothing (or the viewer’s own transparency-indicator pattern).

No. All image processing happens through the Canvas API inside your browser – nothing is sent to a server, logged, or stored, and the tool keeps working offline once the page has loaded.

Yes. The file is yours; no copyright restrictions apply to a transparent rectangle.