How to Use the Image File Size Predictor
Enter the width and height (in pixels) of the image you plan to save, then select an expected format and compression level to estimate its resulting file size. Handy for checking web upload limits or storage space in advance.
Compression Differences by Format
JPEG and WebP use lossy compression, removing color and detail information the human eye is less sensitive to, which greatly reduces file size. PNG uses lossless compression, preserving all original pixel data — resulting in much larger files for photographic images.
Limitations of This Estimate
Actual file size can vary based on an image's color complexity, noise, and specific compression algorithm settings. This calculator provides an average estimate for typical photographic images — check the actual saved file for exact figures.
Frequently Asked Questions
JPEG and WebP use lossy compression, discarding details the human eye is less sensitive to, which shrinks file size significantly. PNG uses lossless compression, preserving all original pixel data, resulting in much larger files.
No. Actual file size depends on the image's color complexity, noise, and specific compression settings. This calculator provides an average estimate for typical photos, useful for roughly gauging upload limits.