Image Compressor

How to Use

1. Click the upload area or drag and drop a JPEG or PNG image.
2. Adjust the Quality slider — lower values = smaller file, less quality.
3. The original and compressed previews appear side by side with file sizes.
4. Click Download Compressed to save the optimised image.

What Is It?

Image compression reduces file size by removing data that is difficult to perceive visually. JPEG compression works by averaging colour values in blocks; PNG uses lossless LZW compression. Our tool uses the HTML5 Canvas API to re-encode your image at your chosen quality level — entirely in your browser, with no server upload.

Why Use Our Tool?

• ✓Compression happens 100% in your browser — images never leave your device.
• ✓Side-by-side preview shows original vs compressed with exact file sizes.
• ✓Adjustable quality slider from 10% to 100%.
• ✓Shows exact file size reduction as a percentage saving.

Frequently Asked Questions

• What image formats are supported?
  JPEG and PNG. The tool uses HTML5 Canvas to re-encode images at your chosen quality level. WebP and GIF are not currently supported.
• Does it upload my image to a server?
  No. Compression happens entirely in your browser using the HTML5 Canvas API. Your image never leaves your device.
• What quality setting should I use?
  70–80% is usually a good balance for web images — significant file size reduction with little visible quality loss. For thumbnails, 50–60% is often fine.
• Is there a file size limit?
  There is no hard limit, but very large images (over 10MB) may be slow to process on some devices.
• Is it free?
  Yes, completely free.

Related Tools