Image Compression

The quality slider controls the compression-to-quality trade-off using the Canvas API's toBlob() method. At quality 1.0 (100%): nearly lossless, minimal size reduction. At 0.85 (85%): excellent quality, 30-50% size reduction — the recommended starting point. At 0.70 (70%): good quality, 50-70% size reduction, minor artifacts visible on close inspection. At 0.50 (50%): noticeable compression artifacts, 60-80% size reduction. Below 0.40: significant quality degradation. For web images viewed at 100% zoom, 80-85% quality is indistinguishable from the original to most people. Artifacts tend to appear first around text and sharp edges.

EXIF (Exchangeable Image File Format) is metadata embedded in JPEG and some other image files by cameras and phones. It can contain: GPS coordinates of where the photo was taken, camera make/model and settings (aperture, shutter speed, ISO), date and time, device software version, and sometimes even the photographer's name. Reasons to remove it: privacy (location data can reveal your home address if you photograph at home), file size (EXIF adds 10-100KB), and professional presentation (publishing client photos without their GPS coordinates embedded). This tool lets you strip EXIF while compressing.

WebP is the modern web format supported by all major browsers since 2020 (Chrome, Safari 14+, Firefox 65+, Edge). WebP lossy mode produces files 25-34% smaller than JPEG at the same visual quality. WebP lossless produces files 26% smaller than PNG. WebP also supports transparency (like PNG) and animation (like GIF). Use WebP for: any image on a website where browser support is not a concern (check your analytics). Use JPEG for: email attachments (better compatibility), legacy systems, when targeting older browsers. Use PNG for: images requiring transparency sent to non-web destinations where WebP is not supported.

10MB per image. The batch limit is 20 images per run. For files over 10MB (very large RAW-derived images or high-DPI photos), use the Image Resize tool first to reduce dimensions, then compress. For batches larger than 20 images, simply process them in multiple runs — the results download independently and do not interfere.

When you enter a target size in KB, the tool iteratively adjusts the quality setting until the compressed file is at or below the target. It starts at a high quality and reduces in steps until the target is reached. This takes slightly longer than direct quality compression because multiple encodes are performed. Use target size when you have a specific constraint (e.g., email attachments under 1MB, profile photos under 200KB) rather than a visual quality target.

PNG uses lossless compression by default — every pixel is preserved exactly. When you compress a PNG with this tool, the Canvas API re-encodes it through the browser's PNG encoder, which may apply better compression than the original file used but does not change pixel values. Converting PNG to JPEG (lossy) or WebP lossy introduces quality loss. If you need true lossless PNG optimization (better than this tool can provide), use pngquant or oxipng for up to 50-80% size reduction with zero visual change.

No. All compression, format conversion, and metadata removal happens in your browser using the Canvas API and FileReader. Your images never leave your device. This is safe for confidential photos, client work, personal images, and any content you would not want uploaded to a third-party server.