Toolsel

Image Compressor

Runs in your browser

Shrink an image's file size with a live quality preview.

What is an Image Compressor?

Image compression trades some visual quality for a smaller file. For photographs, this is usually close to free — JPEG and WebP quality settings in the 75-90% range typically shrink a file by 60-90% with no difference most people can spot at normal viewing size. Below that range, compression artefacts start showing as blockiness or blurring, especially around sharp edges and text.

Smaller images matter beyond storage space: they're the single biggest lever most sites have over page load time, since images are usually the largest assets on a page. A compressed hero image can be the difference between a fast-feeling page and a slow one, and search engines factor page speed into ranking.

How to use it

  1. Drop an image onto the panel — PNG, JPG or WebP.
  2. Choose an output format: keep the original, or switch to JPEG or WebP for smaller lossy output.
  3. Drag the quality slider and watch the estimated file size update live.
  4. Compare the before/after size, then download once you're happy with the trade-off.

Example

Typical result at 80% quality

Input
photo.jpg (3.2 MB)
Output
photo.jpg (540 KB, 83% smaller)

Frequently asked questions

What quality setting should I use?
80-85% is a reasonable default for photographs — it's usually visually indistinguishable from the original at normal viewing sizes while cutting file size substantially. Go higher (90%+) for images with fine detail or text you don't want softened; go lower only if file size is critical and some visible quality loss is acceptable.
Can I compress a PNG without converting it?
PNG compression is lossless by design, so there's no quality slider that shrinks it the way JPEG's does — its file size is mostly fixed by the image content. For a real size reduction on a photographic PNG, converting to JPEG or WebP at a high quality setting will produce a much smaller file with minimal visible difference.
Does compressing lose quality permanently?
Yes, for lossy formats — the discarded detail cannot be recovered from the compressed file. Always keep your original uncompressed image if you might need to re-export it at a different quality later.
Is the image uploaded to compress it?
No. Compression happens entirely in your browser via the Canvas API's built-in encoder. The file is never sent anywhere.