Compress an image to 4 MB.
Drop your photos and download each one as a JPG under 4 MB. The quality is lowered first and the pixel dimensions only when that is not enough; the photo is never cropped. It runs in your browser; nothing is uploaded.
Under 4 MB per image, saved as JPG
Limits come from each platform's own help pages, summarised in the guides (checked 24 September 2026).
Who asks for 4 MB.
Lines from Herofab's platform guides that name 4 MB, as a limit, a recommendation or one end of a range. Each row links to the guide and its official source.
| Platform | Rule | What the guide says | Read |
|---|---|---|---|
| ABOUT YOU | File | JPEG up to 2 MB (white or grey background); PNG up to 4 MB (transparent background) | 10 October 2026 |
| Webflow | File size | 4 MB maximum for each image | 12 October 2026 |
| Webflow | Size | Any image size can be uploaded provided the file is smaller than the 4 MB limit; WebP images have a side length limit of 16,383 pixels | 12 October 2026 |
| SHOPLINE | Recommended | 1,600 pixels wide or wider, with a file size under 4 MB for optimal performance | 12 October 2026 |
4 MB in numbers.
Counted as the compressor counts: 1 KB is 1,000 bytes and 1 MB is 1,000,000 bytes. Bits per pixel divides the limit in bits by the pixels of a 12-megapixel phone photo (4,032 × 3,024 px) kept at full size; the uncompressed size counts 3 bytes per pixel.
- Bytes
- 4,000,000
- Bits
- 32,000,000
- Pixels in a 12-megapixel phone photo
- 4,032 × 3,024 = 12,192,768
- Bits per pixel at full size
- 32,000,000 ÷ 12,192,768 = 2.62
- Uncompressed, 3 bytes per pixel
- 36,578,304 bytes, 9.14 times the limit
Other limits.
4 MB, answered.
Which platforms ask for 4 MB?
ABOUT YOU, Webflow, and SHOPLINE. The table on this page gives each rule in full and links to the platform's guide.
How many bytes is 4 MB?
4,000,000 bytes: the compressor counts 1 MB as 1,000,000 bytes, the stricter of the two common readings. Counted in units of 1,024, 4 MB would be 4,194,304 bytes, so a file under 4,000,000 bytes is under the limit on either count.
How many bits per pixel does 4 MB leave for a 12-megapixel photo?
2.62, if the photo keeps all 12,192,768 pixels (4,032 × 3,024): 32,000,000 bits divided by 12,192,768. Uncompressed, at 3 bytes per pixel, the photo is 36,578,304 bytes, 9.14 times the limit. The compressor lowers the JPG quality first and reduces the pixel dimensions only when that is not enough.
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