TinyPNG
tinypng.com
A free web tool that compresses PNG, JPEG and WebP images using smart lossy compression, usually shrinking files a great deal with little visible change.
TinyPNG shrinks images right in the browser: drop in up to 20 files at a time (the page lists a 5 MB limit per image) and download smaller versions. It handles PNG, JPEG and WebP, and can convert between formats such as AVIF as well.
It uses lossy compression, reducing the number of colours or quality in ways that are usually hard to notice, so the savings are often large. Because it is lossy, keep your originals if you may need them later. The web tool is free within its limits, and the same company sells an API and plugins for larger or automated workloads.
Why it is useful
Smaller images make pages load faster and files easier to email. Drag in your images and download the compressed versions, with no software to install. The free version has limits on batch size and file size.
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