What should I use to convert PNG to WebP without obvious quality loss?

If you want to convert PNG to WebP with no obvious quality loss, the best choice is usually:

Use lossless WebP

That preserves the image exactly or very nearly exactly, while often shrinking file size compared to PNG.

Good tools

1. cwebp (Google’s official WebP encoder)

Best option if you want control and quality.

Example:

cwebp -lossless input.png -o output.webp

Useful options:

• -lossless — true lossless WebP
• -q 100 — for near-lossless/lossy settings, though lossless is safer if you want no visible loss
• -m 6 — slower but better compression

Example with strong compression:

cwebp -lossless -m 6 input.png -o output.webp

2. ImageMagick

Easy if you already use it:

magick input.png output.webp

For lossless:

magick input.png -define webp:lossless=true output.webp

3. ffmpeg (if you’re batch processing media pipelines)

Less common for still images, but possible.

Recommendation

• If you care about no obvious quality loss, use lossless WebP.
• If you want smaller files and can tolerate tiny differences, use near-lossless or high-quality lossy WebP.

Best practical choice

• Official encoder: cwebp
• Command:

  cwebp -lossless -m 6 input.png -o output.webp
  

If you want, I can also give you:

• a Windows/Mac/Linux setup guide,
• a batch conversion command for folders,
• or the best lossy settings that still look visually identical.