RGB to HEX

RGB to HEX reads each line as a colour and writes the sRGB triplet back as a hex colour code. Channels are rounded to the nearest whole number and rendered as two hex digits, so rgb(59, 130, 246) comes back as #3b82f6. What you paste can be a full CSS function, a bare triplet such as 255 255 255 or 59, 130, 246, or percentages like rgb(100% 50% 0%) — a line of loose numbers is read as rgb() provided it carries at least three of them.

Four settings shape the output rather than the colour itself. Uppercase letters turn #3b82f6 into #3B82F6 for codebases that write it that way. The 3-digit form is applied only where every channel pair repeats, so #ffffff collapses to #fff while #ff8801 stays at full length. The leading hash can be switched off for places that supply it themselves, such as an Android colour resource or a query parameter. Translucent colours are either written as 8-digit #RRGGBBAA or cut back to six digits. Each run draws one swatch card per colour — the block of colour carries the full-length code in capitals whatever the settings say, the code in the form you actually asked for sits directly beneath it, and the line you pasted sits under that — and a three-column table follows underneath, listing what you pasted, the hex it became, and the normalised RGB triplet the conversion actually used. Copying takes the bare list of hex codes, one per line, rather than the table.

Three rough edges are worth knowing before you lean on the output. Channel numbers outside 0–255 are clamped with no warning of any kind: rgb(300, -20, 0) converts to #ff0000 and looks like a deliberate red, so an off-by-one in whatever generated the values will not announce itself here. Nothing flags it, but the table's Normalised RGB column shows the triplet the conversion actually used, so reading that against what you pasted is how a stray 300 is caught. Alpha is squeezed into a single byte, so 0.5 becomes the pair 80, which reads back as 0.502; feed 0.502 in again and it still lands on 80, so the loss happens once rather than compounding. And 200 colours is the ceiling for one run; past that the job stops with a count instead of quietly truncating. Lines beginning with // or a hash and a space are skipped as comments, and the whole conversion happens in this browser tab, so the list is not sent anywhere and the page still works with the network off.

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