Loss per share - Schedule of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Basic loss per share:
Net loss attributable to WEBTOON Entertainment Inc.	$ (76,885)	$ (20,118)	$ (70,693)	$ (37,679)
Add: allocation to subsidiary / equity method investee participating security1		47	123	105
Net loss attributable to WEBTOON Entertainment Inc.	$ (76,885)	$ (20,071)	$ (70,570)	$ (37,574)
Shares used in computation:
Weighted-average common shares outstanding	110,102,868	109,505,150	109,804,009	109,505,150
Basic loss per share:	$ (0.7)	$ (0.18)	$ (0.64)	$ (0.34)
Diluted loss per share:
Net loss attributable to WEBTOON Entertainment Inc.	$ (76,885)	$ (20,071)	$ (70,570)	$ (37,574)
Add: dilutive impact of subsidiary / equity method investee stock options	(5)	0	(4)
Diluted net loss attributable to WEBTOON Entertainment Inc.	$ (76,890)	$ (20,071)	$ (70,574)	$ (37,574)
Shares used in computation:
Weighted-average common shares outstanding	110,102,868	109,505,150	109,804,009	109,505,150
Weighted-average common shares outstanding - diluted	110,102,868	109,505,150	109,804,009	109,505,150
Diluted loss per share	$ (0.7)	$ (0.18)	$ (0.64)	$ (0.34)