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Image Compressor

Shrink an image until it is small enough, with the saving shown as you drag. Runs in your browser, so nothing is uploaded anywhere.

How to use the Image Compressor

  1. Drop your image. Drag a file in, or click to choose one from your device.
  2. Drag the quality down. Watch the file size and the preview together, and stop where it still looks right.
  3. Cap the dimensions. Optionally limit the longest side, which usually saves more than quality alone.
  4. Download. Save the smaller copy. The original is untouched.

Frequently asked questions

How small can I make an image without it looking bad?
For photographs, quality around 80 percent is the usual sweet spot: most of the file size goes and the difference is hard to see. Below roughly 60 percent, blocky artefacts start appearing around edges and in flat areas such as skies.
Why does compressing an already compressed JPEG barely help?
Because the detail it would have discarded is already gone. Re-encoding a JPEG also compounds the damage, since each pass discards a little more. Compress from the original whenever you still have it.
What actually makes the biggest difference to file size?
Dimensions, usually by a wide margin. Halving the width and height quarters the pixel count, and file size roughly follows. An image displayed at 800 pixels wide gains nothing from being stored at 4000.
Is compressing a PNG worth it here?
Only a little. PNG is lossless, so the quality setting does nothing to it, and the saving comes from resizing alone. For a photograph stored as PNG, converting it to WebP or JPEG will save far more than any amount of compression.

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