Image Compressor

Kalcify's Image Compressor uses browser-native compression algorithms to reduce file sizes dramatically while preserving visual quality. Adjust the quality slider for complete control, and convert between JPG, PNG, and WebP formats on the fly — all without uploading a single byte to our servers.

A single oversized photo can quietly wreck a web page. Large images are the number one reason sites load slowly, and slow pages cost you real visitors — people tend to leave before the content even appears. Search engines notice too, since page speed is part of how they rank results. Compression fixes this by stripping out data your eyes never miss. A 4MB photo straight off a phone camera can often drop to a few hundred kilobytes with no visible difference, which means faster pages, lower bandwidth bills, and email attachments that actually send. Whether you are speeding up a website, shrinking a file to fit an upload limit, or just clearing space, a smaller image does the same job with far less weight.

There are two ways to make an image smaller. Lossy compression (used by JPG and WebP) throws away some detail to achieve big size reductions — perfect for photographs, where a tiny loss of information is invisible. Lossless compression (used by PNG) keeps every pixel exactly as it was, which matters for logos, screenshots, and graphics with sharp edges or text. The quality slider above lets you find the sweet spot. For most photos, a quality setting around 70–80% cuts the file size hugely while looking identical to the original. Drop lower and you will start to see blocky artifacts; go higher and you gain little but a bigger file. Because everything is processed locally in your browser, you can experiment freely — your images are never uploaded, so nothing you compress leaves your device.