Image Compressor

What is a Image Compressor?

Image compression reduces the file size of photos and graphics by removing redundant or imperceptible data. Unoptimized images are the single largest contributor to slow web page load times — a typical unoptimized JPEG from a smartphone camera is 3-8 MB, while the same image can often be compressed to under 200 KB with no perceptible quality difference. This Image Compressor applies quality-optimized re-encoding to JPEG, PNG, and WebP images entirely in your browser using the HTML5 Canvas API. No image data is ever uploaded to a server. The before/after file size comparison is displayed so you can see exactly how much space was saved.

How to use this tool

1. Upload your image by clicking Upload or dragging it onto the tool.
2. Adjust the quality slider to control the compression level (lower quality = smaller file).
3. Compare the original and compressed file sizes and the visual preview side by side.
4. When satisfied with the quality/size trade-off, click Download to save the compressed image.

Common use cases

• Optimizing images before uploading to a website to improve page load speed
• Reducing photo file sizes before sending via email or messaging apps
• Preparing images to meet a maximum file size requirement for a platform or CMS
• Improving Google PageSpeed Insights and Core Web Vitals scores by reducing image weight
• Batch-optimizing product photos for an e-commerce store

Frequently asked questions

What quality setting should I use?

For web images, a JPEG quality of 75-85% typically reduces file size by 60-80% with no visible quality difference on screen. Below 70%, compression artifacts may become visible — especially in areas with sharp edges or gradients. For print, use 90%+ quality.

What is the difference between lossy and lossless compression?

Lossy compression (used for JPEG and WebP) permanently removes some image data to achieve smaller file sizes. Lossless compression (used for PNG) reduces file size without discarding any data. This tool uses lossy re-encoding for JPEG and WebP, and lossless optimization for PNG.

Can I compress a PNG without losing the transparent background?

Yes. PNG compression in this tool is lossless — it optimizes the file encoding without removing any pixel data, including the alpha (transparency) channel. The compressed PNG is visually identical to the original.

How does this compare to TinyPNG?

TinyPNG uses server-side pngquant for PNG lossy compression (quantizing colors), which can achieve greater compression ratios for PNGs. This tool uses client-side Canvas compression, which is lossless for PNGs but processes everything locally with zero privacy risk. For JPEG and WebP, the results are comparable.