🗜️ ImageCompress

中文
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Drag & drop images here, or click to select

Supports JPG, PNG, WebP, BMP, GIF — up to 50 files, max 50MB each

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100% Private

All compression happens locally in your browser. No files are ever uploaded to any server.

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Batch Processing

Compress up to 50 images at once with drag & drop batch upload support.

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Custom Quality

Adjust compression quality from 1% to 100% with instant preview of results.

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Format Conversion

Convert to JPG, PNG, or WebP while compressing for optimal file size.

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Mobile Friendly

Works perfectly on phones and tablets. Compress images anytime, anywhere.

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Completely Free

No registration, no limits, no watermarks. Free forever.

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How Image Size Affects Web Performance

From Core Web Vitals to real-world loading data, a comprehensive analysis of how image size impacts page speed and how compression can boost performance.

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Best Practices for Batch Image Optimization

When managing hundreds of images, how do you compress them efficiently? From workflow design to automation strategies, master batch optimization techniques.

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Quality vs Size: Finding the Optimal Compression Ratio

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Advanced Guide

Frequently Asked Questions

Does compression reduce image quality?
Moderate compression (70%–85% quality) produces virtually indistinguishable results while reducing file size by 50%–80%. You can freely adjust the quality parameter based on your needs.
Are my images uploaded anywhere?
No. All processing happens entirely in your browser. Your images never leave your device, ensuring complete privacy and security.
What image formats are supported?
We support JPG, PNG, WebP, BMP, and GIF formats. After compression, you can choose to output as JPG, PNG, or WebP.
How many images can I compress at once?
You can compress up to 50 images at once. For more images, simply process them in batches.
How well does PNG compression work?
PNG is a lossless format, so browser-side compression is limited. For better results, consider converting PNG to WebP or JPG (if transparency is not needed).