Document and Entity Information Statement [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact [Member] Business Contact Class of Stock [Axis] Class of Stock [Domain] ADR [Member] American depository shares Common Class A [Member] Class A Ordinary shares Common Class B [Member] Class B Ordinary shares Statement [Line Items] Document and Entity Information Document Type Document Registration Statement Document Annual Report Document Period End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Transition Report Document Shell Company Report Securities Act File Number Entity Registrant Name Entity Incorporation, State or Country Code Contact Personnel Name Country Region City Area Code Local Phone Number Contact Personnel Email Address Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Country Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Document Accounting Standard Entity Shell Company Auditor Firm ID Auditor Name Auditor Location Entity Central Index Key Document Fiscal Period Focus Amendment Flag CONSOLIDATED BALANCE SHEETS Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Related Party [Member] Related Party Nonrelated Party [Member] Nonrelated Party Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents The balances placed with the banks with original maturities over three months, but less than one year. Term Deposits In Bank, Current Term deposits Short-Term Investments Total Short-term investments Restricted Cash, Current Restricted cash Accounts Receivable, after Allowance for Credit Loss, Current Trade receivables Other Receivables, Net, Current Amounts due from related parties Amounts due from subsidiaries and VIEs and VIEs' subsidiaries Prepaid Expense and Other Assets, Current Prepayments and other current assets Total Prepayments and other current assets Assets, Current Total current assets Assets, Noncurrent [Abstract] Non-current assets: Property, Plant and Equipment, Net Property and equipment, net Net book value Finite-Lived Intangible Assets, Net Intangible assets, net Total Goodwill Balance at the end of the year Balance at the beginning of the year Goodwill Long-Term Investments Long-term investments, net Total The balances placed with the banks with original maturities more than one year. Term Deposits In Bank, Non Current Term deposits Operating Lease, Right-of-Use Asset Right-of-use assets Other Assets, Noncurrent Other non-current assets Assets, Noncurrent Total non-current assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDER'S (DEFICIT) / EQUITY Liabilities, Current [Abstract] Current liabilities (including amounts of the consolidated VIEs and their subsidiaries without recourse to the primary beneficiaries of RMB448,836 and RMB356,907 as of December 31, 2024 and 2025, respectively): Current liabilities: Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued liabilities Employee-related Liabilities, Current Salary and welfare payables Taxes Payable, Current Taxes payable Contract with Customer, Liability, Current Contract liabilities Other Liabilities, Current Other current liabilities Total Amounts due to subsidiaries and VIEs and VIEs' subsidiaries Operating Lease, Liability, Current Short-term lease liabilities Short-Term Debt Short-term borrowings Liabilities, Current Total current liabilities Current liabilities Liabilities, Noncurrent [Abstract] Non-current liabilities (including amounts of the consolidated VIEs and their subsidiaries without recourse to the primary beneficiaries of RMB8,637 and RMB7,553 as of December 31, 2024 and 2025, respectively): Non-current liabilities: Operating Lease, Liability, Noncurrent Long-term lease liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Other Liabilities, Noncurrent Other non-current liabilities Liabilities, Noncurrent Total non-current liabilities Non-current liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (See Note 18) Equity, Attributable to Parent [Abstract] Shareholders' equity: Common Stock, Value, Issued Ordinary shares Ordinary shares (US$0.000125 par value) Treasury Stock, Common, Value Treasury stock Additional Paid in Capital Additional paid-in capital Amount of statutory reserves are funds that a company is required by law to set aside from its profits to meet specific regulatory requirements. These reserves are typically mandated by government regulations or accounting standards and serve various purposes, such as ensuring financial stability, protecting creditors, or funding future investments. Statutory Reserves Statutory reserves Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income/(loss) Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Equity, Attributable to Parent Total Zhihu Inc.'s shareholders' equity Equity, Attributable to Noncontrolling Interest Noncontrolling interests Equity, Including Portion Attributable to Noncontrolling Interest Balance as of ending Balance as of beginning Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Recourse Status [Axis] Recourse Status [Domain] Nonrecourse [Member] Without recourse Consolidated Entities [Axis] Consolidated Entities [Domain] Variable Interest Entity, Primary Beneficiary [Member] VIE Common Stock, Par or Stated Value Per Share Ordinary shares, par value Common stock per share Common Stock, Shares Authorized Ordinary shares, shares authorized Common stock shares authorized (in share) Common Stock, Shares, Issued Ordinary shares, shares issued Common Stock, Shares, Outstanding Ordinary shares, shares outstanding CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue from Contract with Customer, Excluding Assessed Tax Revenues (including transactions with related parties of RMB 35,147, RMB 30,830 and RMB 47,472 for the years ended December 31, 2023, 2024 and 2025, respectively) Revenues Cost of Revenue Cost of revenues (including transactions with related parties of RMB 37,074, RMB 29,332 and RMB 21,934 for the years ended December 31, 2023, 2024 and 2025, respectively) Cost of revenues Gross Profit Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses: Selling and Marketing Expense Selling and marketing expenses (including transactions with related parties of RMB 2,585, RMB 57,339 and RMB 28,158 for the years ended December 31, 2023, 2024 and 2025, respectively) Selling and marketing expenses Research and Development Expense Research and development expenses (including transactions with related parties of nil, RMB 1,167 and RMB 1,388 for the years ended December 31, 2023, 2024 and 2025, respectively) Research and development expenses General and Administrative Expense General and administrative expenses (including transactions with related parties of nil, RMB 3,792 and RMB 2,453 for the years ended December 31, 2023, 2024 and 2025, respectively) General and administrative expenses General and administrative expenses Goodwill, Impairment Loss Impairment of goodwill Impairment loss on goodwill Impairment of goodwill Operating Expenses Total operating expenses Operating expenses Operating Income (Loss) Loss from operations Loss from operations Nonoperating Income (Expense) [Abstract] Other income/(expenses): Investment Income, Nonoperating Investment income Interest Income, Deposits with Financial Institutions Interest income Interest income Amount of gain (loss) from change in fair value of financial instruments. Gain (Loss) From Change In Fair Value Of Financial Instruments Fair value change of financial instruments Fair value change of financial instruments Gain (Loss), Foreign Currency Transaction, before Tax Exchange gains/(losses) Exchange gains Other Nonoperating Income (Expense) Others, net Other income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Loss)/Income before income tax Loss before income tax Income Tax Expense (Benefit) Income tax (expenses)/benefits Income tax expenses/(benefits) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net loss Net (loss)/income Net Income (Loss) Attributable to Noncontrolling Interest Net (income)/loss attributable to noncontrolling interests Net loss/(income) attributable to noncontrolling interests Net Income (Loss) Available to Common Stockholders, Basic Net loss attributable to ordinary shareholders Net loss attributable to Zhihu Inc.'s shareholders Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income/(loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustments Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income/(loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive loss Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest Comprehensive (income)/loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss Comprehensive loss attributable to Zhihu Inc.'s shareholders Earnings Per Share, Basic Net loss per share, basic Earnings Per Share, Diluted Net loss per share, diluted Weighted Average Number of Shares Outstanding, Basic Weighted average number of ordinary shares outstanding, basic Weighted average number of ordinary shares, basic Weighted Average Number of Shares Outstanding, Diluted Weighted average number of ordinary shares outstanding, diluted Weighted average number of ordinary shares, diluted Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Domain] Cost of Sales [Member] Cost of revenues Selling and Marketing Expense [Member] Selling and marketing expenses Research and Development Expense [Member] Research and development expenses General and Administrative Expense [Member] General and administrative expenses Share-Based Payment Arrangement, Expense Share-based compensation expenses CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Ordinary shares Treasury Stock, Common [Member] Treasury Stock Additional Paid-in Capital [Member] Additional paid-in capital Represents information pertaining to statutory reserves. Statutory Reserves [Member] Statutory reserves AOCI Attributable to Parent [Member] Accumulated other comprehensive (loss)/income Retained Earnings [Member] Accumulated deficit Noncontrolling Interest [Member] Noncontrolling interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Outstanding Balance as of ending (in shares) Balance as of beginning (in shares) Treasury Stock, Common, Shares Balance as of ending (in shares) Balance as of beginning (in shares) APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Share-based compensation expenses Noncontrolling Interest, Increase from Business Combination Acquisition of a subsidiary with noncontrolling interests The amount of the reduction or elimination during the period of a noncontrolling interest resulting from acquisition of subsidiary along with non-controlling interests. Noncontrolling Interest, Decrease from Acquisition Of Subsidiary Along With Noncontrolling Interest Acquisition of a subsidiary with noncontrolling interests Noncontrolling Interest, Decrease from Deconsolidation Disposal of a subsidiary Noncontrolling Interest, Increase from Subsidiary Equity Issuance Capital contribution from noncontrolling interests Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments Foreign currency translation adjustments Treasury Stock, Value, Acquired, Cost Method Repurchase of shares Treasury Stock, Shares, Acquired Repurchase of shares (in shares) Repurchase of shares (in shares) Stock Repurchased and Retired During Period, Value Cancellation of shares Stock Repurchased and Retired During Period, Shares Cancellation of the repurchased shares Cancellation of shares (in shares) Value of stock issued as a result of the exercise and vesting of share options and restricted shares. Stock Issued During Period, Value, Stock Options And Restricted Shares Exercised And Vested Exercise and vesting of share options and restricted shares Number of share options (or share units) and restricted shares exercised and vested during the current period. Stock Issued During Period, Shares, Stock Options And Restricted Shares Exercised And Vested Exercise and vesting of share options and restricted shares (in shares) Amount converted during the period, from one class to another. Conversion Of Value From One Class To Another Conversion of ordinary shares Number of shares converted during the period, from class to another. Conversion Of Shares From One Class To Another Conversion of ordinary shares (in shares) The amount of transfer from retained earnings to statutory reserves. Transfer of Retained Earnings to Statutory Reserves Appropriations to statutory reserves CONSOLIDATED STATEMENTS OF CASH FLOWS Statement of Cash Flows [Abstract] Cash flows from operating activities: Depreciation, Depletion and Amortization Depreciation of property and equipment and amortization of intangible assets Share-Based Payment Arrangement, Noncash Expense Share-based compensation expenses Amount of accrued investment income of short term investments. Accrued Investment Income Of Short Term Investments Accrued investment income of short-term investments Amount of investment income of long term investments. Investment Income Of Long Term Investments Investment income of long-term investments Deferred Income Tax Expense (Benefit) Deferred income tax Deferred income tax (benefits)/expenses Amount of expense (reversal of expense) for expected credit loss on trade receivables, amount due from related parties and other receivables. Excepted Credit Losses Expense (Reversal) Provision of allowance for expected credit loss Additional/(Reversal of) allowance for credit losses, net of recoveries Gain (Loss) on Disposition of Property Plant Equipment Loss/(Gain) on disposal of property and equipment Gain (Loss) on Disposition of Business Gain on disposal of a subsidiary Gain on disposal of a subsidiary Impairment of Intangible Assets, Finite-Lived Impairment charge Impairment of intangible assets Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Trade receivables Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other current assets