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Document and Entity Information
 12 Months Ended
Jun. 30, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Jun. 30, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Registrant Name OPTHEA LIMITED
Entity Central Index Key 0001815620
Current Fiscal Year End Date --06-30
Entity File Number 001-39621
Entity Incorporation, State or Country Code C3
Entity Address, Address Line One C/- Prime Company Compliance
Entity Address, Address Line Two Level 9
Entity Address, Address Line Three 505 Little Collins Street
Entity Address, City or Town Melbourne
Entity Address, Postal Zip Code 3000
Document Annual Report true
Document Transition Report false
Document Registration Statement false
Document Shell Company Report false
ICFR Auditor Attestation Flag false
Document Accounting Standard International Financial Reporting Standards
Entity Address, Country AU
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Document Financial Statement Error Correction [Flag] false
Entity Interactive Data Current Yes
Auditor Firm ID 1070
Auditor Name Deloitte Touche Tohmatsu
Auditor Location Melbourne, Australia
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of financial position of Opthea Limited and subsidiaries (the “Company”) as of June 30, 2025 and 2024, the related consolidated statements of profit or loss and other comprehensive income, changes in equity, and cash flows, for each of the three years in the period ended June 30, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of June 30, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended June 30, 2025, in conformity with IFRS Accounting Standards as issued by the International Accounting Standards Board (IASB).
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One C/- Prime Company Compliance
Entity Address, Address Line Two Level 9
Entity Address, Address Line Three 505 Little Collins Street
Entity Address, City or Town Melbourne
Entity Address, Postal Zip Code 3000
City Area Code +61 3
Local Phone Number 9826 0399
Contact Personnel Name Jeremy Levin
Contact Personnel Email Address info@Opthea.com
Entity Address, Country AU
American Depository Shares  
Document Information [Line Items]  
Trading Symbol OPT
Title of 12(b) Security American Depositary Shares, each representing eight ordinary shares
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 12,430,322
Ordinary shares [member]  
Document Information [Line Items]  
No Trading Symbol Flag true
Title of 12(b) Security Ordinary shares, no par value
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 1,231,817,008