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Shareholder Report
 12 Months Ended
Apr. 30, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Putnam ETF Trust
Entity Central Index Key 0001845809
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Putnam ESG Ultra Short ETF  
Shareholder Report [Line Items]  
Fund Name Putnam ESG Ultra Short ETF
Class Name Putnam ESG Ultra Short ETF
Trading Symbol PULT
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam ESG Ultra Short ETF for the period May 1, 2025, to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Putnam ESG Ultra Short ETF
$26
0.25%
[1]
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.25%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended April 30, 2026, Putnam ESG Ultra Short ETF returned 4.58%. The Fund compares its performance to the ICE  BofA U.S. Treasury Bill Index, which returned 4.05% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Iinvestment-grade corporate credit exposure was the largest contributor to performance. For the majority of the period, corporate credit spreads tightened. Additionally, issuer selection in the banking sector, the largest sector allocation within the Fund, was additive.
↑
Allocation to commercial paper also contributed to outperformance. The Fund keeps a balance of short-maturity commercial paper for liquidity purposes and as a source of returns.
Top detractors from performance:
↓
Yield curve exposures detracted from performance particularly in early 2026, as interest rates were volatile amidst heightened geopolitical tensions.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended April 30, 2026
 
1 Year
Since Inception
(1/19/2023)
Putnam ESG Ultra Short ETF (NAV)
4.58
5.35
Bloomberg U.S. Aggregate Index
4.06
3.15
ICE BofA U.S. Treasury Bill Index
4.05
4.77
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date May 01, 2025
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236 or visit
https://www.franklintempleton.com/investments/options/exchange-traded-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 42,935,686
Holdings Count | $ / shares 166
Advisory Fees Paid, Amount $ 396,099
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$42,935,686
Total Number of Portfolio Holdings
166
Total Management Fee Paid (based on a unitary fee)
$396,099
Portfolio Turnover Rate
57%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of April 30, 2026)
Portfolio Composition* (% of Total Investments)
image
 [2]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
At a meeting held on March 26, 2026, the Board of Trustees of Putnam ETF Trust, on behalf of the Fund, approved a plan to liquidate and dissolve the Fund, upon recommendation by Putnam Investment Management, LLC, the Fund’s investment adviser.
The liquidation of the Fund is expected to occur on or about June 16, 2026 (the “Liquidation Date”), although the Fund may make dispositions of portfolio holdings prior to the Liquidation Date.
Effective as of the close of business on May 19, 2026, the Fund will no longer accept orders for the purchase of creation units, and effective as of the close of business on June 9, 2026, the Fund will no longer accept redemption orders. Trading for the Fund on NYSE  Arca, Inc. will be suspended prior to market open on June 10, 2026.
When the Funds are in the process of liquidating their portfolios, which is anticipated to commence prior to June 10, 2026, the Funds will hold cash and securities that may not be consistent with the Funds’ investment objectives and strategies.
This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or ETFs-Product@franklintempleton.com.
Material Fund Change Objectives [Text Block] At a meeting held on March 26, 2026, the Board of Trustees of Putnam ETF Trust, on behalf of the Fund, approved a plan to liquidate and dissolve the Fund, upon recommendation by Putnam Investment Management, LLC, the Fund’s investment adviser.
Material Fund Change Strategies [Text Block] When the Funds are in the process of liquidating their portfolios, which is anticipated to commence prior to June 10, 2026, the Funds will hold cash and securities that may not be consistent with the Funds’ investment objectives and strategies.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or ETFs-Product@franklintempleton.com.
Updated Prospectus Phone Number (800) DIAL BEN/342-5236
Updated Prospectus Email Address ETFs-Product@franklintempleton.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
* Does not include derivatives, except purchased options, if any.