Before/After SliderSize Reduction %100% Private
How It Works
1
Upload Image
Drop a JPG, PNG, or WebP image.
2
Set Quality
Adjust the quality slider to balance size and quality.
3
Compare & Download
Use the comparison slider and download the compressed image.
Frequently Asked Questions
How does image compression work?
This tool uses the Canvas API to re-encode your image at a lower quality setting. The browser discards some visual data that is less noticeable to the human eye, resulting in a smaller file size with minimal visible difference.
What quality setting should I use?
For web images, 70-80% quality typically reduces file size by 40-60% with minimal visible difference. For social media, 60-75% works well. For print or archival, use 90-95%.
Does PNG compression work differently?
Yes. PNG is a lossless format, so the Canvas API cannot reduce PNG quality the same way it does for JPG/WebP. For PNG files, the size reduction may be minimal. Consider converting to JPG or WebP for better compression.
What is the before/after comparison slider?
After compression, a draggable slider lets you compare the original and compressed images side by side. Drag the slider left and right to inspect quality differences at specific areas of the image.
Are my images uploaded to a server?
No. All compression happens locally in your browser using the Canvas API. Your images never leave your device.
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