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COVER - USD ($) $ in Millions	12 Months Ended
COVER - USD ($) $ in Millions	Dec. 31, 2025	Feb. 28, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
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	001-40963
Entity Registrant Name	Allbirds, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-3999983
Entity Address, Address Line One	530 Washington St.
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94111
City Area Code	628
Local Phone Number	225-4848
Title of 12(b) Security	Class A Common Stock, $0.0001 par value per share
Trading Symbol	BIRD
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 58.6
Documents Incorporated by Reference	Portions of the registrant's definitive proxy statement relating to the 2026 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such definitive proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the registrant's fiscal year ended December 31, 2025.
Entity Central Index Key	0001653909
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,167,752
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,540,381