JPG to WebP Converter

What the JPG to WebP Converter Does

This converter takes a JPEG — or in fact any image your browser can decode, including PNG — and re-encodes it as WebP, the format Google built for the web. The payoff is size: at matching quality, WebP files run roughly a quarter to a third smaller than JPEG, which means faster pages and less storage.

It draws your image onto a canvas at its original width and height, then exports WebP at a fixed quality of 0.92. The dimensions are untouched — this is a format swap, not a resize.

How It Works

Drop or pick an image. It is decoded and drawn onto an in-memory canvas at its native resolution, and the tool shows you the pixel dimensions.

On download, the canvas is encoded to WebP at quality 0.92 by your browser's built-in encoder and saved with a .webp extension, keeping your original base name.

Because the pixels pass through a canvas, the new file carries no EXIF or GPS metadata — camera and location tags are dropped, which is good for privacy.

Processing pipeline

1. Decode locally. Your selected file is read and decoded into pixels in the browser — never uploaded.
2. Draw to a canvas. The pixels are painted onto an in-memory canvas at the image's original width and height.
3. Encode as WebP. The canvas is exported to WebP at quality 0.92 using the browser's native encoder.
4. Download the .webp. The result is saved with your original base name and a .webp extension.

Privacy

Your image never leaves your device. It is decoded, drawn and re-encoded entirely in your browser; the tool uploads nothing.

The canvas re-encode strips all EXIF and GPS metadata, so the WebP you download carries no camera model, timestamp or location tags from the original.

There is no server, no account and no stored copy. Close the tab and nothing remains.

Technical Details

Standards & references

• WebP (Google) — An open image format from Google; lossy WebP is 25 to 34% smaller than JPEG at equivalent SSIM quality, and supports an alpha channel that JPEG lacks.
• Canvas toBlob — The browser's HTMLCanvasElement.toBlob encodes the canvas to WebP; the quality argument, here 0.92, applies to lossy formats.

Accuracy & Limitations

WebP encoding here is lossy at quality 0.92, so the result is not a pixel-perfect copy. At 0.92 the difference is hard to see, but converting an already-compressed JPEG adds a second round of lossy compression on top of the first — re-encoding never restores detail the JPEG already discarded.

The image is not resized; the WebP has the same pixel dimensions as your input. The size saving comes purely from WebP's more efficient compression, not from shrinking the picture.

Browsers each ship their own WebP encoder, so the exact file size and any subtle artefacts can vary a little from one browser to another.

On a browser that cannot encode WebP (very old versions), the canvas falls back to PNG, so you would get a lossless but larger file — check the extension if the size looks off.

Real-World Use Cases

When to use it — and when not to

If you need a universally compatible file, use the WebP to JPG converter; for a lossless copy keep the PNG; to make the picture smaller in dimensions, use the image resizer.

Frequently Asked Questions

References

• An image format for the Web — WebP (Google for Developers)
• HTMLCanvasElement: toBlob() (MDN)

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