Online Image Compressor

Reduce file size, not quality. The smart way to optimize images for websites, apps, and emails.

For PNGs, this controls color reduction (Quantization). 80%+ is usually visually lossless.

Click to select images

or drag and drop them here

Key Features

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Private & Secure

Your photos never leave your device. All compression happens locally in your browser, so you can safely process sensitive documents or personal photos.

⚡

Blazing Fast

Powered by advanced WebAssembly algorithms (UPNG & Pako). Get near-native compression speeds without installing bulky software.

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Batch Processing

Have a folder full of images? Drag and drop them all at once. Review the size savings for each and download everything in a single ZIP file.

Why Optimize Your Images?

Images often account for more than 60% of a webpage's total file size. Large, unoptimized images slow down your site, frustrate mobile users, and hurt your SEO rankings. By compressing your images, you can:

  • Boost Page Speed: Faster loading times lead to lower bounce rates.
  • Improve SEO: Google prioritizes fast sites in search results (Core Web Vitals).
  • Save Bandwidth: Reduce hosting costs and data usage for your visitors.

The Science Behind "Smart Compression"

How do we reduce file size by 70% without making the image look bad? It's not magic; it's science. Our tool uses different strategies depending on the file format:

1. For PNG Images (Smart Quantization)

PNG files support 24-bit color, allowing for millions of colors. However, most images (like icons, screenshots, or illustrations) don't actually need that many.

We use an intelligent color quantization algorithm (similar to TinyPNG) that:

  1. Analyzes the image to find the most dominant colors.
  2. Reduces the palette from millions to 256 or fewer colors.
  3. Converts the data to an efficient 8-bit index format.
  4. Applies dithering to smooth out gradients and prevent "banding."

The result? An image that is drastically smaller in bytes but looks virtually identical to the human eye. We also strip unnecessary metadata (like EXIF data) to save every last byte.

2. For JPG/JPEG Images

JPEG uses "lossy" compression, which simplifies the details of an image that are hard for the human eye to see. Our tool lets you balance the Compression Quality. A setting of 80% usually reduces file size significantly with zero noticeable loss in quality for photographs.

Which Format Should I Choose?

Choosing the right format is half the battle. Here is a quick guide:

JPG

Best for Photos

Complex colors, real-world scenes. No transparency.

PNG

Best for Graphics

Logos, screenshots, flat art. Supports transparency.

WebP

Best for Web

Superior compression for both photos and graphics.

Frequently Asked Questions

Will my image look blurry?
Not if you use the right settings. For PNGs, our quantization algorithm is designed to be "visually lossless," meaning the human eye cannot easily distinguish the changes. For JPGs, keeping the quality above 70-80% typically ensures a sharp image.
Are my files uploaded to your server?
No. This is a client-side tool. The compression logic runs entirely within your browser using JavaScript and WebAssembly. Your images never leave your computer, making this tool safe for confidential or personal photos.
Why is the file size larger after compression?
This rarely happens, but if your original image was already highly optimized (e.g., using a tool like Photoshop's "Save for Web"), re-compressing it might add a small amount of overhead or metadata. If you see this, your image is already as small as it can get!