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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About Image Compressor

What this tool does

Image editing tools let you resize, crop, compress, rotate, flip, and add watermarks to your images. All operations happen in-browser using the HTML5 Canvas, so your photos stay on your machine and are never uploaded to any server.

Why use this tool

Preparing images for a website, social media post, or email attachment usually means opening a heavy editor like Photoshop. These tools give you the most common operations in a single click, without any installation, account, or subscription.

How it works

Each tool reads your image into a canvas element, applies the requested transformation (scale, crop region, rotation angle, compression level), and generates a new downloadable file. Batch mode processes multiple images with the same settings in sequence.

Pro tip

When resizing for the web, aim for 2x the display dimensions to look sharp on Retina screens, then compress at 75-80% quality. This gives you the best balance of sharpness and speed.

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Part of these workflows

Website Image Optimization

3 steps

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