Compress an image to 500 KB.
Drop your photos and download each one as a JPG under 500 KB. 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 500 KB 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 500 KB.
Lines from Herofab's platform guides that name 500 KB, 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 |
|---|---|---|---|
| Squarespace | File size | A limit of 20 MB per image; Squarespace recommends 500 KB or less so the site loads quickly | 11 October 2026 |
| Square Online | File size | Up to 15 MB per image in the US Support Center and the Catalog API; the UK edition of the same article says up to 20 MB and recommends 500 KB or less for faster page loading | 12 October 2026 |
| OpenCart | File size | 100–500 KB per image is recommended; the performance guideline is to keep each image under 500 KB and to compress images before upload | 12 October 2026 |
| Jimdo | Image weight | Jimdo's storage tips suggest web-optimised JPEG or WEBP images of about 0.5–1.5 MB each for most pages and products | 12 October 2026 |
500 KB 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
- 500,000
- Bits
- 4,000,000
- Pixels in a 12-megapixel phone photo
- 4,032 × 3,024 = 12,192,768
- Bits per pixel at full size
- 4,000,000 ÷ 12,192,768 = 0.328
- Uncompressed, 3 bytes per pixel
- 36,578,304 bytes, 73.2 times the limit
Other limits.
500 KB, answered.
Which platforms ask for 500 KB?
Squarespace, Square Online, OpenCart, and Jimdo. The table on this page gives each rule in full and links to the platform's guide.
How many bytes is 500 KB?
500,000 bytes: the compressor counts 1 KB as 1,000 bytes, the stricter of the two common readings. Counted in units of 1,024, 500 KB would be 512,000 bytes, so a file under 500,000 bytes is under the limit on either count.
How many bits per pixel does 500 KB leave for a 12-megapixel photo?
0.328, if the photo keeps all 12,192,768 pixels (4,032 × 3,024): 4,000,000 bits divided by 12,192,768. Uncompressed, at 3 bytes per pixel, the photo is 36,578,304 bytes, 73.2 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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