Supports JPG, PNG, WebP, GIF, BMP
About Image Compression
How does image compression work?
Image compression reduces file size by lowering the quality level of the encoded image data. For JPEG and WebP files, this discards fine detail that the human eye is unlikely to notice at normal viewing distances. PNG uses lossless compression, so file size savings are typically smaller. This tool uses your browser's built-in Canvas API — no server involved.
When should I compress an image?
Compress images before emailing them, uploading to websites with file size limits, posting on social media, or storing large photo libraries. A good rule of thumb: if a photo is over 1 MB and you don't need print quality, compress it. Most web and messaging use cases are well-served by the Medium quality setting.
Frequently Asked Questions
Does compressing an image reduce its dimensions?
No. This tool reduces file size by re-encoding the image at a lower quality level. The pixel dimensions (width × height) remain the same.
Which format gives the best compression — JPEG, PNG, or WebP?
For photos, JPEG and WebP give the best compression. For images with transparency or sharp edges (logos, screenshots), PNG is better. WebP typically produces smaller files than JPEG at equivalent quality and is supported by all modern browsers.
Is the compression lossless?
For JPEG and WebP, compression is lossy — some detail is discarded. PNG compression is lossless, meaning no quality is lost, but savings are smaller. The tool uses the Canvas API to re-encode the image at your chosen quality level.
Why did my compressed file turn out larger?
This can happen when the source image is already well-optimized, or when converting from JPEG to PNG (PNG is lossless). Try a higher compression level, or switch the output format to JPEG or WebP.
Is my image uploaded to a server?
No. Your images are processed entirely in your browser using the Canvas API. Nothing is sent to any server.