Extract colour palette

By bucketing, not by clustering. Each pixel is placed in a bucket using the top 4 bits of its red, green and blue values, the buckets are sorted by how many pixels landed in them, and the top ones are reported as the average colour of their bucket. This is not k-means, so two similar shades can both appear if they fall in different buckets.

The share of the image pixels that fell into that bucket, to one decimal place. The output lists each colour as a hex value followed by its percentage, under a heading naming your file and its pixel dimensions. The percentages will not add up to 100 unless you asked for enough colours to cover every bucket.

How many colours to return defaults to 5 and accepts a whole number from 1 to 32. Anything else stops with "count must be a whole number between 1 and 32". If the image has fewer distinct buckets than you asked for, you simply get fewer lines.

It ignores it. The alpha channel is not read at all, so fully transparent pixels still contribute their underlying red, green and blue to the count. On a PNG with a large transparent area, that hidden colour can dominate the result. Flatten the image first if that matters.

No, the output is text only, and no image is re-encoded. Copy the hex values into your own design or code. The file is decoded in a Web Worker on your device and nothing is uploaded. Every format Convert image reads is accepted; anything else stops with a message naming your file and the formats that are readable.