Compress Images Online for Free with Quality Control
Reduce image file size while controlling the final quality level.
Clear interfaceSimple steps and a direct result
Fast performanceBuilt for mobile and desktop
Privacy firstProcessing stays on your device
Compress Image File Size Online While Preserving Quality
Compress Images Online and Reduce File Size
Nujiz helps you reduce image file sizes directly in your browser. Choose a compression preset, adjust image quality, and select the output format to prepare images for websites, email attachments, or everyday storage.
The tool provides an estimated output size before processing. The actual file size is determined after the compressed image has been generated.
How to Compress an Image
- Upload an image from your computer or phone.
- Choose a compression preset or adjust the quality manually.
- Select an output format or use automatic mode.
- Review the estimated output size.
- Start processing the image.
- Check the result and download the compressed file.
Reduce Image File Size While Managing Quality
Compression results depend on the original image, output format, and quality settings. Stronger compression can create smaller files but may also reduce fine detail or introduce visible compression artifacts.
For a balanced result, begin with moderate compression and inspect the output. Increase quality if important details are lost.
JPG vs PNG vs WebP Compression
JPG: Commonly used for photographs and supports adjustable lossy compression.
PNG: Useful for graphics and transparency. Its compression behavior differs from JPG, so quality settings may not reduce file size in the same way.
WebP: A modern image format that can provide efficient compression. The automatic mode in this tool uses WebP, although final results depend on the image and settings.
Image Compression vs Image Resizing
Compression reduces the file size through encoding and quality settings. Resizing changes the pixel dimensions of an image.
To change width and height, use the image resizing tool. To reduce file size without automatically changing dimensions, use this image compression tool.
Can You Compress an Image to a Specific File Size?
The tool estimates the output size before processing, but it does not guarantee an exact target such as 100KB or 200KB. The final size depends on the original image, selected format, and compression level. You can adjust the settings and process the image again to approach your preferred size.
Frequently Asked Questions
Is the estimated file size exact?
No. The estimate is approximate. The actual file size is known after processing.
Which format does automatic mode use?
Automatic mode uses WebP for efficient compression in modern browsers.
Can I adjust the compression level?
Yes. You can select presets or adjust quality manually.
Does compression change image dimensions?
Basic compression re-encodes the image without automatically changing its dimensions.
Are images processed in my browser?
Yes. The compressed image is generated locally in your browser.