Image Compressor

Compress images to reduce file size
This free online image compressor runs in your browser and is part of our Image Tools collection.

Image Compressor

Compress images to reduce file size while maintaining quality.

Tips:

  • Lower quality = smaller file size
  • WebP format typically provides better compression
  • PNG compression uses color quantization (reduces color palette)
  • JPEG/WebP use lossy compression (better file size reduction)
  • PNG format supports transparency (use for logos, icons)
  • Quality 70-85 is recommended for web use
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Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online Image Compressor

1 Upload or Drop Images

Drag and drop your JPEG, PNG, or WebP photos into the upload zone or select them from your file manager.

2 Adjust Compression Quality Slider

Set compression quality between 1% and 100% (70%–80% provides massive 60%–85% file size reductions with zero perceptible loss in visual quality).

3 Optionally Set Max Dimensions

Enable max width or height downscaling to automatically resize high-megapixel smartphone photos for fast web loading.

4 Inspect Savings & Download

Compare before/after file sizes and visual fidelity side-by-side, then download individual images or download all as a ZIP archive.

Frequently Asked Questions

Common questions about using this free online image compressor.

How does in-browser image compression work? ▾
The tool decodes your image into an HTML5 Canvas element in your browser memory and recompresses it using optimized quantization tables and modern codecs (such as WebP and MozJPEG-compatible algorithms) without uploading to any remote server.
Can I compress PNG images with transparent backgrounds? ▾
Yes. Transparent PNGs can be compressed losslessly or converted to modern WebP format, which preserves 100% alpha transparency while cutting file size by up to 70%.
Is there any image file size or quantity limit? ▾
Because compression runs locally on your computer's CPU and GPU, you can compress multiple 20MB+ DSLR camera photos without hitting cloud upload limits.
What is the optimal compression setting for website images? ▾
Setting quality to 75%–80% and converting to modern WebP format is the optimal balance recommended by Google Core Web Vitals to improve Google PageSpeed scores.

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