Basis of presentation (Details)	12 Months Ended
Basis of presentation (Details)	Dec. 31, 2024	Dec. 31, 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	100.00%
Advent Technologies Inc. [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company Name	Advent Technologies, Inc.
Country of Incorporation	USA
Statements of Operations date	01/01 – 12/31	01/01 – 12/31
Advent Technologies Inc. [Member] \| Direct Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	100.00%
Advent Technologies Inc. [Member] \| Indirect Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest
Advent Technologies S.A. [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company Name	Advent Technologies S.A.
Country of Incorporation	Greece
Statements of Operations date	01/01 – 12/31	01/01 – 12/31
Advent Technologies S.A. [Member] \| Direct Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest
Advent Technologies S.A. [Member] \| Indirect Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	100.00%
Advent Technologies LLC [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company Name	Advent Technologies LLC
Country of Incorporation	USA
Statements of Operations date	01/01 – 12/31	01/01 – 12/31
Advent Technologies LLC [Member] \| Direct Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest
Advent Technologies LLC [Member] \| Indirect Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	100.00%
Advent Technologies GmbH [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Company Name	Advent Technologies GmbH
Country of Incorporation	Germany
Statements of Operations date	01/01 – 12/31	01/01 – 12/31
Advent Technologies GmbH [Member] \| Direct Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest	100.00%
Advent Technologies GmbH [Member] \| Indirect Ownership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership Interest