Image Compressor

Reduce image file sizes without significant quality loss, directly in your browser, with no uploads to any server. This client-side image compressor supports JPEG, PNG, and WebP formats and gives you full control over the quality-to-size trade-off through an intuitive slider interface.

Images are often the largest assets on a web page, and uncompressed images can dramatically slow down page load times, hurt search engine rankings, and increase bandwidth costs for both website operators and visitors on metered connections. Whether you are preparing product photos for an e-commerce store, compressing hero images for a landing page, shrinking attachments for email, or simply freeing up storage space on your device, reducing image file sizes is one of the most impactful optimizations you can make.

How it works: When you upload an image, the tool loads it into memory using the browser-native Canvas API. For JPEG and WebP output, the browser re-encodes the image data at your chosen quality level, discarding high-frequency visual detail that the human eye is least likely to notice. For PNG output, the tool leverages the browser's built-in PNG encoder, which applies lossless deflate compression. After processing completes, you see a clear before-and-after comparison showing original file size, compressed file size, and the percentage reduction achieved.

Compression results vary depending on the source material. Photographs with complex textures and gradients typically compress well — reductions of 60-80% are common at quality levels that still look visually identical to the original. Screenshots, illustrations, and graphics with large areas of solid color may see smaller reductions but still benefit significantly from re-encoding, especially when converting from PNG to WebP or JPEG format.

The quality slider ranges from 0 (maximum compression, lowest visual fidelity) to 100 (minimum compression, highest fidelity). For most web use cases, a quality setting between 70 and 85 provides an excellent balance where the compressed image is visually indistinguishable from the original at normal viewing distances, yet the file size reduction is substantial. For print materials or archival purposes, you may want to stay closer to 90-95. For thumbnails or preview images where speed matters more than fidelity, values as low as 50-60 can be perfectly acceptable.

Privacy is a core design principle of this tool. All image processing happens entirely in your browser using the HTML5 Canvas API. Your images are never uploaded to any server, never stored in any cloud, and never accessible to anyone else. When you close or refresh the page, all image data is released from memory. There are no accounts, no cookies tracking your usage, and no server-side logs of your activity. This makes the tool safe for compressing sensitive documents, confidential product photos, or any other images you would not want to share with a third-party service.

Supported input formats include JPEG, PNG, WebP, GIF (first frame), BMP, and TIFF. The output is produced in your chosen format with the quality level you select. You can compress a single image or batch-process multiple images in one session, downloading each result individually.