Image to WebP Converter

How it actually works

Any PNG, JPG, JPEG or GIF you load is decoded by the browser and redrawn on a canvas, then encoded as WebP. You get two mutually exclusive modes: lossy, driven by a quality slider from 0 to 100 that defaults to 85, or lossless, which overrides the slider entirely and stores the pixels exactly as they are using a different entropy coder.

Lossy mode is a perceptual trade, quantising frequency data the way a JPEG does but with better block prediction. Lossless mode is a packing problem: nothing is thrown away, the encoder only finds shorter ways to describe the same pixels, so savings come from the structure of the image rather than from discarding detail.

What that means for your results

Rule of thumb for choosing: photographs and gradients go lossy at 75 to 90; screenshots, line art, text and flat logos usually do better lossless, because sharp single-pixel transitions are exactly what lossy encoders smear.

Lossless WebP typically beats PNG on size for the same image, often by 10 to 25%, which makes it a good container for interface graphics. Lossy usually beats JPEG by a similar margin. What neither mode can do is repair a poor source: convert from the original capture, not from a file that has already been compressed twice.

Batch conversion and preview are supported, so you can compare the sizes before downloading anything.

Where it falls short — honestly

WebP is broadly supported today, but it is not universal: very old browser versions and some in-app or embedded webviews still cannot decode it, so a page that must serve everyone needs a JPEG or PNG fallback in the markup rather than WebP alone.

This tool is one-directional, image into WebP. Going the other way, a WebP back to a JPG, is handled by Image Compressor, which accepts any image the browser can decode and forces JPEG output. GIF animation is also flattened to a single frame here.

If you want a specific smaller output size rather than a specific quality, iterate the slider in steps of five and watch the byte count.

A real end-to-end workflow

Before-and-after weight check for a content page: convert the hero image here at 85%, keep the original as backup, and measure the page with Page Speed Checker to see the effect on load time.

For an interface export, screenshot the panel, convert lossless here, and use Color Picker on the result if you need to confirm brand colours survived unchanged.