S000077138 [Member] Investment Risks - Putnam BioRevolution ETF	Apr. 30, 2025
Fluctuation of net asset value and share price risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Fluctuation of net asset value and share price risk: Shares may trade at a larger premium or discount to the fund’s net asset value than shares of other ETFs. The net asset value of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for the fund’s shares may result in the fund’s shares trading significantly above (at a premium) or below (at a discount) net asset value or the intraday value of the fund’s holdings. In addition, in stressed market conditions or periods of market disruption or volatility, the market for fund shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.
Trading issues risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Trading issues risk: There is no guarantee that the fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the fund’s shares or to submit purchase and redemption orders for creation units. The market prices of the fund’s shares are expected to fluctuate, in some cases materially, in response to changes in the fund’s net asset value, the intraday value of the fund’s holdings and supply and demand for the fund’s shares. The Investment Manager cannot predict whether the fund’s shares will trade above, below or at their net asset value or the intraday value of the fund’s holdings. During such periods, investors may incur significant losses if they sell shares. The securities held by the fund may be traded in markets that close at a different time than the exchange on which the fund’s shares are listed. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the exchange is open but after the applicable market closing, fixing or settlement times, bid‑ask spreads on the exchange and the corresponding premium or discount to the shares’ net asset value may widen.
Large shareholder transaction risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large shareholder transaction risk: The fund is subject to the risk that shareholders will purchase or redeem large quantities of shares of the fund. The fund may be an investment option for mutual funds that are managed by the Investment Manager, as defined below, and its affiliates as “funds of funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. In addition, a large number of shareholders may collectively purchase or redeem fund shares in large amounts rapidly or unexpectedly. Large shareholder transactions may adversely affect the fund’s liquidity and net assets. These redemptions may also adversely affect the fund’s performance if the fund is forced to sell securities, which may also increase the fund’s brokerage costs.
Authorized participant concentration risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Authorized participant concentration risk: Only an authorized participant may engage in creation and redemption transactions directly with the fund. The fund may have a limited number of financial institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that those authorized participants do not engage in creation and redemption orders, there may be a significantly diminished trading market for fund shares or fund shares may trade at a discount (or premium) to net asset value and possibly face trading halts and/or de‑listing.
Cash transactions risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Cash transactions risk: Unlike certain ETFs, the fund may effect creations and redemptions in cash or partially in cash. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in‑kind. As such, investments in the fund’s shares may be less tax‑efficient than an investment in an ETF that distributes portfolio securities entirely in‑kind.
Market risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk: The value of investments in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, asset class, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject.
Common stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Common stock risk: Common stock represents an ownership interest in a company. The value of a company’s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company’s products or services. A stock’s value may also fall because of factors affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases in production costs. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.
Foreign investments risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign investments risk: Foreign investments involve certain special risks. For example, their values may decline in response to changes in currency exchange rates, unfavorable political and legal developments, unreliable or untimely information, and economic and financial instability. In addition, the liquidity of these investments may be more limited than for most U.S. investments, which means the fund may at times be unable to sell them at desirable prices. Foreign settlement procedures may also involve additional risks. These risks are generally greater in the case of developing (also known as emerging) markets, which typically have less developed legal and financial systems.
Small and midsize companies risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Small and midsize companies risk: Stocks of small and midsize companies often trade in smaller volumes, and their prices may fluctuate more than stocks of larger companies. Stocks of these companies may therefore be more vulnerable to adverse developments than those of larger companies.
Industry or sector concentration risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Industry or sector concentration risk: From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, including the health care, consumer discretionary, consumer staples, biotechnology and materials sectors, which would make the fund more vulnerable to adverse developments affecting those industries or sectors.
Management and operational risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Management and operational risk: There is no guarantee that the investment techniques, analyses, or judgments that the Investment Manager applies in making investment decisions for the fund will produce the intended outcome or that the investments selected for the fund will perform as well as other securities that were not selected for the fund. The Investment Manager, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
Risk of investing in biology revolution companies [Member]
Prospectus [Line Items]
Risk [Text Block]	Risk of investing in biology revolution companies: Biology revolution companies face intense competition and potentially rapid product obsolescence. Biology revolution companies may be adversely affected by the loss or impairment of intellectual property rights and other proprietary information or changes in government regulations. The potential for an increased amount of required disclosure or lack of access to proprietary scientific information could negatively impact the performance of these companies. The fund may invest in companies that operate in industries that are likely to be impacted by the biology revolution over time. However, certain of these companies do not currently derive a substantial portion of their current revenues from biology revolution activities and there is no assurance that any company will do so in the future, which may adversely affect the ability of the fund to achieve its investment objective.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Non‑diversified risk: As a non‑diversified fund, the fund invests in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds. Moreover, the gains and losses on a single investment may have a greater impact on the fund’s net asset value and may make the fund more volatile than more diversified funds.

S000077138 [Member] Investment Risks - Putnam BioRevolution ETF

Apr. 30, 2025

Fluctuation of net asset value and share price risk: Shares may trade at a larger premium or discount to the fund’s net asset value than shares of other ETFs. The net asset value of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for the fund’s shares may result in the fund’s shares trading significantly above (at a premium) or below (at a discount) net asset value or the intraday value of the fund’s holdings. In addition, in stressed market conditions or periods of market disruption or volatility, the market for fund shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.

Prospectus [Line Items]

Risk [Text Block]

Trading issues risk: There is no guarantee that the fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the fund’s shares or to submit purchase and redemption orders for creation units. The market prices of the fund’s shares are expected to fluctuate, in some cases materially, in response to changes in the fund’s net asset value, the intraday value of the fund’s holdings and supply and demand for the fund’s shares. The Investment Manager cannot predict whether the fund’s shares will trade above, below or at their net asset value or the intraday value of the fund’s holdings. During such periods, investors may incur significant losses if they sell shares.

The securities held by the fund may be traded in markets that close at a different time than the exchange on which the fund’s shares are listed. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the exchange is open but after the applicable market closing, fixing or settlement times, bid‑ask spreads on the exchange and the corresponding premium or discount to the shares’ net asset value may widen.

Large shareholder transaction risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Large shareholder transaction risk: The fund is subject to the risk that shareholders will purchase or redeem large quantities of shares of the fund. The fund may be an investment option for mutual funds that are managed by the Investment Manager, as defined below, and its affiliates as “funds of

funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. In addition, a large number of shareholders may collectively purchase or redeem fund shares in large amounts rapidly or unexpectedly. Large shareholder transactions may adversely affect the fund’s liquidity and net assets. These redemptions may also adversely affect the fund’s performance if the fund is forced to sell securities, which may also increase the fund’s brokerage costs.

Authorized participant concentration risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Authorized participant concentration risk: Only an authorized participant may engage in creation and redemption transactions directly with the fund. The fund may have a limited number of financial institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that those authorized participants do not engage in creation and redemption orders, there may be a significantly diminished trading market for fund shares or fund shares may trade at a discount (or premium) to net asset value and possibly face trading halts and/or de‑listing.

Cash transactions risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Cash transactions risk: Unlike certain ETFs, the fund may effect creations and redemptions in cash or partially in cash. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in‑kind. As such, investments in the fund’s shares may be less tax‑efficient than an investment in an ETF that distributes portfolio securities entirely in‑kind.

Market risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market risk: The value of investments in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, asset class, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject.

Common stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Common stock risk: Common stock represents an ownership interest in a company. The value of a company’s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company’s products or services. A stock’s value may also fall because of factors affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases in production costs. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Foreign investments risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Foreign investments risk: Foreign investments involve certain special risks. For example, their values may decline in response to changes in currency exchange rates, unfavorable political and legal developments, unreliable or untimely information, and economic and financial instability. In addition, the

liquidity of these investments may be more limited than for most U.S. investments, which means the fund may at times be unable to sell them at desirable prices. Foreign settlement procedures may also involve additional risks. These risks are generally greater in the case of developing (also known as emerging) markets, which typically have less developed legal and financial systems.

Small and midsize companies risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Small and midsize companies risk: Stocks of small and midsize companies often trade in smaller volumes, and their prices may fluctuate more than stocks of larger companies. Stocks of these companies may therefore be more vulnerable to adverse developments than those of larger companies.

Industry or sector concentration risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Industry or sector concentration risk: From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, including the health care, consumer discretionary, consumer staples, biotechnology and materials sectors, which would make the fund more vulnerable to adverse developments affecting those industries or sectors.

Management and operational risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Management and operational risk: There is no guarantee that the investment techniques, analyses, or judgments that the Investment Manager applies in making investment decisions for the fund will produce the intended outcome or that the investments selected for the fund will perform as well as other securities that were not selected for the fund. The Investment Manager, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund.

Risk of investing in biology revolution companies [Member]

Prospectus [Line Items]

Risk [Text Block]

Risk of investing in biology revolution companies: Biology revolution companies face intense competition and potentially rapid product obsolescence. Biology revolution companies may be adversely affected by the loss or impairment of intellectual property rights and other proprietary information or changes in government regulations. The potential for an increased amount of required disclosure or lack of access to proprietary scientific information could negatively impact the performance of these companies. The fund may invest in companies that operate in industries that are likely to be impacted by the biology revolution over time. However, certain of these companies do not currently derive a substantial portion of their current revenues from biology revolution activities and there is no assurance that any company will do so in the future, which may adversely affect the ability of the fund to achieve its investment objective.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

It is important to understand that you can lose money by investing in the fund.

Risk Not Insured Depository Institution [Member]

Prospectus [Line Items]

Risk [Text Block]

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Nondiversified Status [Member]

Prospectus [Line Items]

Risk [Text Block]

Non‑diversified risk: As a non‑diversified fund, the fund invests in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds. Moreover, the gains and losses on a single investment may have a greater impact on the fund’s net asset value and may make the fund more volatile than more diversified funds.