Estimating image file sizes helps you plan optimization before processing. Approximate file sizes for common configurations at 80% JPEG quality: 800x600 is about 50-80KB, 1200x800 is about 80-150KB, 1920x1080 is about 150-300KB, and 3840x2160 is about 500KB-1MB.
PNG files are typically 3-10x larger than JPEG for photographic content. WebP files are typically 25-35% smaller than JPEG at equivalent quality.
Factors that affect file size include image dimensions (more pixels means larger files), compression quality (lower quality means smaller files), image complexity (simple graphics compress better than detailed photos), and format (WebP is smaller than JPEG which is smaller than PNG for photos).
With ImgTools, adjust the quality slider and check the output to verify the file size meets your requirements. Process and download to confirm the actual size.
All processing happens locally in your browser.