Creative Tools
Image File Size Estimator
Enter pixel size, bit depth and a compression factor to see approximate megabytes.
How big will an image file be?
Uncompressed image size is roughly width × height × bytes per pixel (bit depth ÷ 8). Divide by a compression factor to sketch JPEG or similar lossy sizes — factor 10 is a rough mid-quality starting guess, not a promise. A 4000×3000 24-bit RGB frame is about 36 MB raw; ÷10 ≈ 3.6 MB. Bit depth matters: 32-bit RGBA stores an alpha channel; 8-bit grey is one channel. Real encoders, chroma subsampling and metadata move the needle. For moving pictures see video file size and related rate planning with video bitrate.
Worked example
4000×3000×3 bytes = 36,000,000 bytes ≈ 36 MB uncompressed; compression factor 10 → ≈ 3.6 MB.
Limits and assumptions
Uniform compression factor. Does not model PNG filters, TIFF variants or camera RAW containers.
Frequently asked questions
What is bit depth?
How many bits store each pixel’s colour. 24-bit RGB uses 8 bits each for red, green and blue; 32-bit usually adds 8 bits of alpha (transparency).
What is a compression factor?
A simple divisor: uncompressed bytes ÷ factor ≈ estimated file size. Higher factors mean smaller, often lower-quality files.
MB or MiB?
This page uses decimal megabytes (÷ 1,000,000) for planning.
Does resolution alone decide size?
No — bit depth and compression dominate once pixel count is fixed.