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Image Compressor

Compress one image or a batch locally with quality, target-size, transparency and ZIP controls, then compare and download every result.

How to Use

  1. 1Add one or more images and click a file to make it the active preview.
  2. 2Choose an output format, or use Auto to preserve each source format; adjust quality and transparency for the kind of image you have.
  3. 3Optionally enable a target size in KB. The browser lowers lossy quality progressively and reports when a target cannot be reached without damaging the image.
  4. 4Compress the active image or process every selected image separately; use Create ZIP when one local archive is more convenient.
  5. 5Compare original and compressed previews, inspect each batch result, then download the file or ZIP. Nothing is uploaded.

About this tool

A private browser-based image compressor for reducing photo and graphic file sizes without sending files to a server. Quality, format, transparency and batch output are controlled on your device.

Example: lower JPEG quality to reduce a 2 MB photo before emailing it. PNG screenshots may already be smaller than a re-encoded copy.

Frequently Asked Questions