What do the colours of the Slovenia flag mean?

White: a pan-Slavic colour, from the Carniolan arms. Blue: a pan-Slavic colour. Red: a pan-Slavic colour.

How do you tell the Slovenia flag from the Slovakia one?

Slovakia's shield sits closer to the centre and shows a white double cross on three blue hills.

When was the Slovenia flag adopted?

The current design dates from 1991, and its official ratio is 1:2.

The flag of Slovenia

Three equal horizontal bands of white, blue and red, with a coat of arms showing Mount Triglav and three gold stars in the upper hoist corner.

Ratio 1:2 · current design adopted 1991

Without the arms this is the Russian flag, which is why the emblem sits in the upper hoist where it is visible even on a furled flag. Slovenia has debated replacing the design several times since 1991 — a 2003 competition produced a winner that was never adopted — precisely because the tricolour is shared with Russia and Slovakia. The three stars come from the medieval Counts of Celje, the only Slovene dynasty of European standing. The blue and red are legally specified but drift widely in practice.

Flags it gets confused with

Flag	How to tell them apart
Slovakia	Slovakia's shield sits closer to the centre and shows a white double cross on three blue hills.
Russia	Russia has no emblem at all.

What the colours mean

Flag laws usually specify a Pantone chip, a CMYK mix or just a colour name. Converting any of those to sRGB is lossy, which is why published hex values disagree.

The symbols on it

What	What it stands for
Triglav	The country's highest mountain, drawn as a white triple peak
Two wavy lines	The Adriatic and Slovenia's rivers
Three gold stars	From the arms of the Counts of Celje

Ratio: 1:2
Current design adopted: 1991
Colours: white, blue, red

Common questions

What does the flag of Slovenia look like?: Three equal horizontal bands of white, blue and red, with a coat of arms showing Mount Triglav and three gold stars in the upper hoist corner.
What do the colours of the Slovenia flag mean?: White: a pan-Slavic colour, from the Carniolan arms. Blue: a pan-Slavic colour. Red: a pan-Slavic colour.
How do you tell the Slovenia flag from the Slovakia one?: Slovakia's shield sits closer to the centre and shows a white double cross on three blue hills.
When was the Slovenia flag adopted?: The current design dates from 1991, and its official ratio is 1:2.

Slovenia Capital, area, population and currency
The flag of Slovakia Routinely mistaken for this one
The flag of Russia Routinely mistaken for this one
Every flag with white in it
The flag of United States Ratio 10:19
The flag of India Ratio 2:3
The flag of United Kingdom Ratio 1:2
The flag of Canada Ratio 1:2
The flag of Japan Ratio 2:3
The flag of France Ratio 2:3
The flag of Brazil Ratio 7:10
The flag of Italy Ratio 2:3

Sources

Wikidata — Wikimedia Foundation (CC0 1.0)

How these figures are compiled and checked