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Cover	Aug. 06, 2026
Cover [Abstract]
Document Type	8-K
Document Period End Date	Aug. 06, 2026
Entity Registrant Name	PubMatic, Inc.
Entity Incorporation, State or Country Code	DE
Entity File Number	001-39748
Entity Tax Identification Number	20-5863224
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	PUBM
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false
Entity Central Index Key	0001422930
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