Reduce Image File Size in Your Browser Compress images by adjusting quality to reduce file size while maintaining visual quality.

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Image Compress

Compress images by adjusting quality to reduce file size while maintaining visual quality.

Upload Your Image

Drop or select any image file you want to compress.

Adjust Quality

Use the quality slider to balance between file size and visual quality.

Download Compressed

See the size reduction stats and download your optimized image.

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What Is Image Compress?

An image compressor reduces the file size of your images by adjusting the encoding quality. This is essential for web optimization, email attachments, and storage management. The tool lets you control the compression level with a quality slider from 1% to 100%, giving you fine-grained control over the size-quality tradeoff. You can see the original and compressed file sizes side by side, along with the percentage reduction. The tool supports JPEG and WebP output formats. All processing happens in your browser for maximum privacy.

Why Use Image Compress?

Visual quality slider for precise compression control
Real-time file size comparison (original vs. compressed)
Choose between JPEG and WebP output formats
No server upload — images stay on your device

Common Use Cases

Website Speed Optimization

Reduce image sizes to dramatically improve web page load times and Core Web Vitals scores.

Email Attachments

Compress photos to fit within email attachment size limits.

Social Media Upload

Optimize images before uploading to avoid platform re-compression artifacts.

Storage Management

Reduce image file sizes to save disk space and cloud storage costs.

Technical Guide

Image compression uses the Canvas API toBlob method with a quality parameter (0.0 to 1.0). For JPEG, the quality parameter controls DCT quantization level. For WebP, it similarly controls lossy encoding aggressiveness. The tool draws the image to a canvas at its original dimensions, then exports it with the specified quality. File size reduction is calculated by comparing the original file size with the compressed Blob size. At quality 80-85%, most images achieve 60-70% size reduction with imperceptible quality loss.

Tips & Best Practices

1
Quality 80-85% offers the best balance of size reduction and visual quality
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WebP typically produces 25-35% smaller files than JPEG at equivalent quality
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Photos compress better than graphics with sharp edges and text
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Preview the compressed image to check for artifacts before downloading

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Frequently Asked Questions

Q What quality level should I use?

For web use, 80-85% quality offers excellent visual quality with significant size reduction.

Q Is JPEG or WebP better for compression?

WebP generally achieves better compression than JPEG at the same visual quality, but JPEG has wider compatibility.

Q Can I compress PNG images?

Yes, but the output will be in JPEG or WebP format since PNG is lossless.

Q Will the image dimensions change?

No, compression only reduces file size. The pixel dimensions remain the same.

Q Can I compress without quality loss?

At 100% quality, compression is minimal but effectively lossless.

About This Tool

Image Compress is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.