Compress Image to Target Size (KB)

Getting an image down to an exact file size is essential when you need to meet upload limits on forums, social media platforms, job portals, or e-commerce websites. Our browser-based tool makes this trivially easy — and completely private.

1. Upload your image: Drag and drop a JPG, PNG, WEBP, or AVIF file onto the upload area above, or click to browse your device. A preview will appear instantly along with smart size presets generated from a quick scan of your image.
2. Set your target size: Choose between Auto mode (targets 50% of the original file size) or Custom Size mode where you enter an exact number of kilobytes (KB). Click any preset button or type your own value.
3. Compress automatically: Hit the compress button and watch the tool work through its intelligent two-phase algorithm. It first estimates the right quality level, then fine-tunes it in small steps until your target is met — or gets as close as visually possible.
4. Download the result: Once compression finishes, review the before/after stats. If you are happy, click download. The image keeps its original format and filename, with “-compressed” appended.

Unlike many online image compressors that send your files to a remote server, this tool processes everything locally in your browser using Web Workers. That means your photos and sensitive images never leave your computer. There are no data caps, no registration walls, and no hidden fees — just fast, reliable compression at your fingertips.

The intelligent two-phase algorithm is designed to find the sweet spot between file size and visual quality. It starts with an educated guess based on your target size, then runs up to four fine-tuning passes to zero in on the perfect compression level. If quality alone cannot reach the target, it gracefully reduces resolution in controlled steps.