Free Online Tool

Compress Image to 300 KB

Targets a 300 KB output. Adjust the target value in the tool below if needed. Compress up to 5 images at once.

100% Private

Instant Results

No Sign-up

Why Choose Our Image Compressor?

Professional-grade compression with unmatched privacy and speed

Lightning Fast

Advanced browser-based compression delivers results in seconds, not minutes.

100% Private

Your images never leave your device. All processing happens locally in your browser.

Smart Quality

Intelligent algorithms maintain visual quality while achieving maximum compression.

Free Forever

No sign-ups, no limits, no watermarks. Completely free to use, always.

How to Compress an Image

Three simple steps to smaller, optimized images

Upload Your Image

Drag and drop your image files or click to browse. We support JPEG, PNG, WebP, GIF, and BMP. Select up to 5 images at once.

Choose Compression Mode

Select "By File Size" to hit a specific KB or MB target, or "By Quality" to set a quality percentage between 1–100%.

Download Compressed Image

Click compress and download your optimized image instantly. Your original file remains untouched on your device.

Perfect For Every Use Case

Optimize images for any purpose with our versatile compression tool

Email Attachments

Reduce image sizes to meet email attachment limits without losing clarity.

Website Optimization

Speed up your website by compressing images for faster load times.

Social Media

Optimize images for Instagram, Facebook, Twitter without quality loss.

Storage Savings

Free up disk space by compressing your photo library efficiently.

Frequently Asked Questions

Everything you need to know about image compression

Our tool uses advanced JavaScript and Canvas APIs to process your images directly in your web browser. When you upload an image, it's decoded, processed through our compression algorithms, and re-encoded — all without ever leaving your device.

We support all major image formats including JPEG, PNG, WebP, GIF, and BMP. The compressed output is saved as a high-quality JPEG file, which offers the best balance of quality and file size.

Our intelligent compression algorithms are designed to maintain visual quality while reducing file size. For most uses, compressed images are virtually indistinguishable from originals.

Yes! You can select up to 5 images at a time. The total combined size must not exceed 25 MB. Each image is compressed sequentially and results are shown inline for download.

Absolutely. Your images are processed entirely in your browser using client-side JavaScript. No data is ever uploaded to our servers.

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Compress Image to 300 KB — Free Online Tool

Need your image to be exactly 300 KB? Our free online image compressor lets you target a specific file size in KB or MB with precision. Upload your JPEG, PNG, WebP, GIF, or BMP image and we'll automatically adjust the quality to hit your target — all in your browser, with no uploads to any server.

How It Works

When you select "By File Size" mode and enter 300 KB, our tool runs a binary search over JPEG quality levels to find the highest quality setting that fits within your target. Large images are automatically downscaled to make the target achievable.

Privacy & Security

Your images are processed entirely client-side in WebAssembly. They never leave your device, ensuring complete privacy and security.