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Document and Entity Information
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol GRVY
Entity Registrant Name GRAVITY CO., LTD.
Entity Central Index Key 0001313310
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding 6,948,900
Title of 12(b) Security American depositary shares, each representing one share of common stock
Entity File Number 000-51138
Entity Address, Address Line One 15F, 396 World Cup bukro
Entity Address, City or Town Mapo-gu, Seoul
Entity Address, Postal Zip Code 121-795
Entity Address, Country KR
Security Exchange Name NASDAQ
Entity Incorporation, State or Country Code M5
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Registration Statement false
Document Accounting Standard International Financial Reporting Standards
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 15F, 396 World Cup bukro
Entity Address, City or Town Mapo-gu, Seoul
Entity Address, Postal Zip Code 03925
Entity Address, Country KR
Contact Personnel Name Heung Gon Kim
City Area Code 82
Local Phone Number 2-2132-7000
Contact Personnel Fax Number 82-2-2132-7070