Image Compressor
Compress images online by adjusting quality. See file size savings instantly with before/after preview. Download optimized images.
Drop an image here or click to upload
PNG, JPEG, WebP, GIF, BMP
About Image Compressor
The Image Compressor tool reduces the file size of your images by adjusting compression quality. Upload any image, drag the quality slider to your preferred level, and instantly see how much space you save - all without leaving your browser.
A quality slider from 1% to 100% gives you precise control over the compression level. As you adjust the slider, the tool shows the original file size alongside the compressed size and calculates the percentage saved. This real-time feedback lets you find the sweet spot between visual quality and file size for your specific needs.
The before-and-after preview makes it easy to spot any quality loss. Most photographs look nearly identical at 75-85% quality while achieving significant file size reductions. At lower quality settings, you may notice JPEG artifacts around edges and in gradient areas - the preview helps you decide when the trade-off is acceptable.
Common use cases include optimizing images for websites to improve page load speed, reducing photo sizes before emailing, preparing images for content management systems with upload size limits, and batch-compressing screenshots or product photos for storage efficiency.
The compression happens entirely in your browser using the HTML5 Canvas API. No images are uploaded to any server, so your files remain private. The tool supports PNG, JPEG, and WebP output formats. Download the compressed result with a single click when you are satisfied with the quality.
Frequently Asked Questions
How much can I reduce an image's file size?
The savings depend on the original image and the quality level you choose. Photographs compressed at 70-80% quality typically see a 40-60% size reduction with minimal visible difference. Lowering quality further increases savings but introduces more visible artifacts.
What is the difference between lossy and lossless compression?
This tool uses lossy compression via the canvas toDataURL quality parameter, which discards some image data to achieve smaller files. Lossy compression works extremely well for photographs. For graphics with sharp edges or text, higher quality settings (85%+) are recommended to avoid blurring.
Does compression change the image dimensions?
No. Compression only reduces file size by adjusting how pixel data is encoded. The width and height of your image remain exactly the same. If you also need to resize, use the Image Resizer tool.
Which format gives the smallest file size?
WebP generally produces the smallest files at equivalent quality settings, followed by JPEG. PNG uses lossless compression and produces larger files but preserves every pixel exactly. For photographs, JPEG or WebP at 75-85% quality offers the best balance of size and quality.