v3.26.1
Cover page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 19, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36153    
Entity Registrant Name Criteo S.A.    
Entity Incorporation, State or Country Code I0    
Entity Address, Address Line One 32 Rue Blanche    
Entity Address, City or Town Paris    
Entity Address, Country FR    
Entity Address, Postal Zip Code 75009    
Country Region 33    
City Area Code 75    
Local Phone Number 85 09 39    
Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,254
Entity Common Stock, Shares Outstanding (in shares)   49,859,086  
Central Index Key 0001576427    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag true    
Documents Incorporated by Reference None.    
Amendment Description EXPLANATORY NOTEThis Amendment No. 1 on Form 10-K/A (this “Amendment” or "Form 10-K/A") amends our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 filed with the Securities and Exchange Commission (the “SEC”) on February 26, 2026 (the “Original 10-K”), to include the information required by Items 10 through 14 of Part III of the Original 10-K. This information was previously omitted from the Original 10-K in reliance on General Instruction G(3) to Form 10-K, which permits such information to be incorporated by reference to our annual meeting definitive proxy statement filed no later than 120 days after our fiscal year-end. We are filing this Amendment to present the information required by Part III of Form 10-K as we will not file our annual meeting definitive proxy statement within 120 days of the end of our fiscal year ended December 31, 2025.Pursuant to SEC rules, Part IV, Item 15 has also been amended to contain the currently dated certificates from the Company’s principal executive and financial officer and principal accounting officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. The certificates of the Company’s principal executive and financial officer and principal accounting officer are attached to this Amendment as Exhibits 31.3 and 31.4. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. Additionally, we are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment.Except for the information described above, the Company has not modified or updated disclosures provided in the Original 10-K in this Amendment. Accordingly, this Amendment does not reflect events occurring after the filing of the Original 10-K or modify or update those disclosures affected by subsequent events. Information not affected by this Amendment is unchanged and reflects the disclosures made at the time the Original 10-K was filed.    
American Depositary Shares      
Document Information [Line Items]      
Title of 12(b) Security American Depositary Shares, each representing one ordinary share, nominal value €0.025 per share    
Trading Symbol CRTO    
Security Exchange Name NASDAQ    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Ordinary shares, nominal value €0.025 per share    
Security Exchange Name NASDAQ    
No Trading Symbol Flag true