Free online image tool
Image Compressor
Reduce image file size by adjusting output quality before downloading.
Compressed Preview
Upload an image to start processing.
What is this tool?
Image Compressor reduces image file size by exporting a new copy with a chosen quality setting. It is useful before uploading photos to websites, online stores, forms, email, blog posts, or social media. Large images can slow pages down, fail upload limits, or make files harder to share, so compression is often part of a healthy publishing workflow.
The goal is not simply to create the smallest possible file. A good compressed image should still look clean in its final context. A product photo, portrait, or portfolio image may need higher quality, while a small thumbnail or background image can usually tolerate stronger compression. The page shows original and compressed sizes so you can make a practical decision instead of guessing.
For best results, resize oversized images first, then compress the resized copy. A photo that is 4000 pixels wide will often remain heavier than needed even after compression if the page only displays it at 900 pixels wide. Combining resize and compression usually gives a smaller file with fewer visible quality problems.
How to use Image Compressor
Follow these steps to process your image locally in the browser and download the result.
- Step 1
Upload the image you want to reduce.
- Step 2
Adjust the compression quality slider.
- Step 3
Compare the original file size with the compressed result.
- Step 4
Preview important details such as faces, text, product edges, and gradients.
- Step 5
Download the compressed image as a new file.
Key features
- Quality slider for balancing file size and visual detail.
- Original and compressed file size comparison.
- Preview before downloading the optimized image.
- Useful for website performance, email attachments, upload limits, and content publishing.
- Browser-based processing for supported image formats.
- Exports a new copy so your source image remains available.
Supported formats
Compression works best with browser-readable image files such as JPG, PNG, and WebP. JPG and WebP are usually the most useful outputs for smaller photo files. PNG may be better for graphics or transparency when file size is less important.
Privacy note
ImageToolkit is designed to handle this task in your browser whenever the selected file type is supported. The image you choose is processed on your device for preview and export, and ImageToolkit does not require an account or intentionally upload the original image to an ImageToolkit server for these browser-first tools.
Related image tools
Image Resizer
Resize JPG, PNG, or WebP images by entering custom width and height.
cropCrop Image
Crop an image freely with a draggable crop box and download the result.
convertJPG to PNG Converter
Convert JPG images to PNG directly in your browser.
convertPNG to JPG Converter
Convert PNG images to JPG with a white background for transparency.
Frequently Asked Questions
What quality setting should I use?+
For many photos, 70 to 85 percent is a good starting range. Use higher quality for product photos, portraits, and detailed images.
Why is my compressed image still large?+
The image may have very large pixel dimensions. Resize it closer to the final display size before compressing.
Does compression damage image quality?+
Lower quality settings can create artifacts. Preview the result and use the smallest file that still looks acceptable.
Can I use this before uploading to a website?+
Yes. Compressing images before upload can improve page speed and reduce storage or bandwidth usage.
Are compressed images uploaded to ImageToolkit?+
ImageToolkit is designed to handle this task in your browser whenever the selected file type is supported. The image you choose is processed on your device for preview and export, and ImageToolkit does not require an account or intentionally upload the original image to an ImageToolkit server for these browser-first tools.