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Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2023	Feb. 21, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39748
Entity Registrant Name	PUBMATIC, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-5863224
Title of 12(b) Security	Class A common stock, $0.0001 par value per share
Trading Symbol	PUBM
Security Exchange Name	NASDAQ
Entity 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			$ 810.1
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for its 2024 annual meeting of stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2023.
Amendment Flag	false
Entity Central Index Key	0001422930
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		41,270,102
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,738,452