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Cover Page
 12 Months Ended
Dec. 31, 2022
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2022
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Entity Registrant Name ChipMOS TECHNOLOGIES INC.
Entity Central Index Key 0001123134
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 727,240,126
Document Annual Report true
Document Transition Report false
Entity Interactive Data Current Yes
Document Shell Company Report false
Entity Incorporation, State or Country Code F5
Document Accounting Standard International Financial Reporting Standards
Entity Voluntary Filers No
Entity Address, Address Line One No. 1, R&D Road 1
Entity Address, Address Line Two Hsinchu Science Park
Entity Address, City or Town Hsinchu
Entity Address, Country TW
Entity Address, Postal Zip Code 300-092
ICFR Auditor Attestation Flag true
Auditor Name PricewaterhouseCoopers
Auditor Firm ID 1345
Auditor Location Taipei, Taiwan
Document Registration Statement false
Entity File Number 001-37928
ADR [member]  
Document Information [Line Items]  
Trading Symbol IMOS
Title of 12(b) Security American Depositary Shares
Security Exchange Name NASDAQ
Ordinary shares [member]  
Document Information [Line Items]  
Title of 12(b) Security Common Shares, par value NT$10 per share
No Trading Symbol Flag true
Security Exchange Name NASDAQ
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One No. 1, R&D Road 1
Entity Address, Address Line Two Hsinchu Science Park
Entity Address, City or Town Hsinchu
Entity Address, Country TW
Entity Address, Postal Zip Code 300-092
City Area Code 886
Local Phone Number 3-577-0055
Contact Personnel Name Silvia Su