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Income and expenses - Income taxes - Deferred tax additional information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Innovation income deduction % 85.00%      
Unused tax loss carry-forward, tax credits and other € 119,042 € 144,465 € 91,753  
Deferred tax assets 3,523 3,971 2,797  
Deferred tax liabilities 3,202 2,660 3,725  
Materialise NV        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Unused tax loss carry-forward, tax credits and other 55,669 70,402 46,533  
Tax losses carried forward and Innovation Income Deductions | Materialise USA        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 1,200 500   € 1,000
Tax losses carried forward and Innovation Income Deductions | Materialise NV        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 0 1,300 100  
Tax losses carried forward and Innovation Income Deductions | ACTech, Inc.        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets € 0 1,000 € 0  
Connection with business combination        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liabilities   € 4,804