Compress images and convert to WebP format directly in your browser. Adjust quality, compare original vs compressed side by side, and download — free, private, no upload.
Drop image here or click to select
Supports PNG, JPG, WebP — max 20 MB
Image Compressor & WebP Converter is a free online tool that reduces image file sizes directly in your browser using the HTML5 Canvas API. No files are ever uploaded to a server — everything happens locally on your device, ensuring complete privacy. Large, unoptimized images are one of the top causes of slow page loads and poor Largest Contentful Paint (LCP) scores. Google uses Core Web Vitals, including LCP, as a ranking signal: images that take too long to load can directly hurt your position in search results. By compressing your images and converting them to modern formats like WebP, you can reduce file sizes by 50–80% with virtually no perceptible quality loss, improving both user experience and SEO performance.
WebP is a modern image format developed by Google that provides superior compression for images on the web. WebP images are typically 25–35% smaller than equivalent JPEG files and support transparency (like PNG) at a fraction of the file size. All modern browsers including Chrome, Firefox, Safari, and Edge support WebP. Use WebP when you want the smallest possible file size for web-optimized images. Keep JPEG or PNG if you need maximum compatibility with older software or print workflows.
Essential terms and definitions related to Image Compressor & WebP Converter.
A modern image format developed by Google that provides both lossy and lossless compression. WebP images are 25-35% smaller than equivalent JPEG files and support transparency (like PNG) and animation (like GIF). All modern browsers support WebP, making it the recommended format for web-optimized images.
Lossy compression (JPEG, WebP lossy) permanently removes image data to achieve smaller file sizes — the original cannot be perfectly reconstructed. Lossless compression (PNG, WebP lossless) reduces file size without any data loss. Lossy is ideal for photos; lossless is essential for graphics, logos, and images requiring pixel-perfect accuracy.
The HTML5 Canvas API provides a JavaScript drawing surface that can manipulate images pixel by pixel. For compression, an image is drawn to a canvas and re-exported at a lower quality using canvas.toBlob() or canvas.toDataURL(). This enables client-side image compression without any server upload, preserving user privacy.
No. All compression happens entirely in your browser using the HTML5 Canvas API. Your images never leave your device, making this tool completely safe for confidential, proprietary, or personal photos.
WebP is a modern image format developed by Google that provides 25–35% smaller file sizes compared to JPEG at equivalent quality. It supports both lossy and lossless compression, as well as transparency (like PNG). All modern browsers support WebP, making it ideal for web-optimized images.
Lossy compression (JPEG, WebP) removes some image data to reduce file size. At quality levels above 70%, the difference is virtually imperceptible to the human eye. PNG compression is lossless — it reduces file size without any quality loss, but the savings are smaller.
You can upload PNG, JPEG, and WebP images. The tool can output in any of these formats, so you can also use it to convert between formats — for example, converting a PNG to WebP for smaller file sizes.
Results vary depending on the original image and quality setting. Converting a PNG to WebP at 80% quality typically reduces file size by 60–80%. JPEG to WebP conversion commonly achieves 25–35% savings. Use the quality slider to find your ideal balance between size and quality.
Common errors developers encounter and how to resolve them.
Compressed file is larger than the original This can happen when compressing an already-optimized image or when converting from a lossy format (JPEG) to a lossless format (PNG). Solution: try a lower quality setting, or switch to WebP or JPEG output format. PNG compression is lossless and may produce larger files than lossy formats for photographic images.
Browser shows "Canvas tainted" or CORS error This error occurs when an image loaded from a cross-origin source is drawn to canvas. Since this tool uses local file upload (not URL loading), you should not encounter this error. If you do, make sure you are uploading a file from your device rather than providing a URL.
WebP format not supported: Download produces a broken file WebP encoding via Canvas.toBlob() is supported in all modern browsers (Chrome, Firefox, Safari 16+, Edge). If you are using an older browser — particularly Safari 15 or earlier — WebP encoding may silently fail or produce an empty file. Solution: update your browser to the latest version, or choose JPEG as the output format instead.
Image loses transparency after compression JPEG format does not support transparency — transparent areas will be rendered as white (or black depending on the browser). To preserve transparency, use WebP or PNG as the output format. WebP supports transparency with significantly smaller file sizes than PNG.