Free Image & Video Compressor

Compress images to WebP and convert any video to WebM, lossless or lossy, compared side by side. 100% private: nothing is ever uploaded, everything runs in your browser.

Compress images

JPG, PNG, GIF & more → WebP · 4 sizes × lossless & lossy

Compress video

MP4, MOV, MKV & more → WebM · up to 500 MB

A free, private image compressor & WebP converter

sotiny.co.uk is a free online image compressor and WebP converter that shrinks your photos and graphics right inside the browser. Drop in a JPG, PNG, GIF, AVIF, TIFF, BMP or SVG and get an optimised WebP back in seconds, in four sizes and in both lossless and lossy quality, so you can compare every option and download exactly the file you need.

Because everything runs locally using the real libwebp encoder compiled to WebAssembly, your images are never uploaded to a server. That makes it completely private, fast, and free forever, with no sign-up, no watermarks and no limits.

Need to shrink footage too? The built-in video compressor takes MP4, MOV, MKV, AVI and most other formats and converts them all to WebM (VP8) — ideal for fast-loading background and stock video on a website. It runs the same way, entirely in your browser via ffmpeg.wasm, on files up to 500 MB, with High, Balanced and Small quality tiers so you can trade size against fidelity.

How to compress an image

  1. Add your images. Drag & drop them onto the box above, or click to choose files. You can compress many at once.
  2. Compare the results. Each image is shown at 100%, 75%, 50% and 25% size, in lossless and lossy, with the exact file size and saving for every option.
  3. Download what you need. Pick a size and quality per image, or grab everything as a single ZIP. Need a full walkthrough? See our guide to compressing images.

Why compress your images

Faster websites

Smaller images mean quicker page loads and better Core Web Vitals, good for users and for SEO.

100% private

Files are processed in your browser and never leave your device. Read our privacy policy.

Lossless & lossy

See both versions side by side and choose the best size-to-quality trade-off. Learn the difference.

Every format

JPG, PNG, GIF, WebP, AVIF, TIFF, BMP and SVG in, optimised WebP out. See the formats guide.

Frequently asked questions

Is this image compressor really free?
Yes. It is completely free to use with no sign-up, no watermarks and no limits, and it will stay free forever. More features are on the way.
Are my images uploaded to a server?
No. All compression and conversion happens locally in your web browser. Your images never leave your device, which makes it completely private and very fast.
Which image formats can I compress or convert?
You can compress and convert JPG/JPEG, PNG, GIF, WebP, AVIF, TIFF, BMP and SVG. Everything is exported as optimised WebP in both lossless and lossy versions.
What is the difference between lossless and lossy?
Lossless keeps every pixel identical to the original, best for graphics and screenshots. Lossy discards a small amount of detail you cannot see to make photos far smaller. The tool shows both so you can choose.
Can I compress video too?
Yes. Drop an MP4, MOV, MKV, AVI or most other formats into the video tool and it is converted to WebM (VP8) right in your browser, on files up to 500 MB. Choose High, Balanced or Small, and switch between them to compare. Like the image tool, your video is never uploaded.

Want to go deeper? Learn why WebP makes sites faster, compare WebP vs JPG vs PNG, read our full FAQ, or learn more about the project.