v3.26.1
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 BDC Income ETF  
Shareholder Report [Line Items]  
Fund Name Putnam BDC Income ETF
Class Name Putnam BDC Income ETF
Trading Symbol PBDC
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam BDC Income 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 BDC Income ETF
$75
0.75%
[1]
Expenses Paid, Amount $ 75
Expense Ratio, Percent 0.75%
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 BDC Income ETF returned 0.13%. The Fund compares its performance to the S&P BDC Index, which returned -1.87% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
Underweight position in FS KKR Capital, which provides customized credit solutions.
Overweight position in Trinity Capital, which specializes in private credit.
Overweight position in Suro Capital, a venture capital firm.
Top detractors from performance:
Overweight position in Blue Owl Technology Finance, which specializes in technology-related debt and equity investments.
Not owning Gladstone Investment, which provides debt and equity financing.
Not owning Goldman Sachs BDC, which provides tailored financing solutions.
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
(9/29/2022)
Putnam BDC Income ETF (NAV)
0.13
14.62
Russell 3000 Index
31.01
21.32
S&P BDC Index
-1.87
11.22
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 $ 278,063,558
Holdings Count | $ / shares 24
Advisory Fees Paid, Amount $ 1,794,881
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$278,063,558
Total Number of Portfolio Holdings
24
Total Management Fee Paid (based on a unitary fee)
$1,794,881
Portfolio Turnover Rate
38%
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?
Effective September 25, 2025, the Fund’s prospectus and summary prospectus disclosure regarding the Fund’s non-diversified status was deleted to reflect that the Fund is currently operating as a diversified fund. Under a new non-fundamental investment policy adopted by the Trustees, the Fund may not and will not: (A) With respect to 75% of its total assets, invest in securities of any issuer if, immediately after such investment, more than 5% of the total assets of the Fund (taken at current value) would be invested in the securities of such issuer; provided that this limitation does not apply to obligations issued or guaranteed as to interest or principal by the U.S. government or its agencies or instrumentalities or to securities issued by other investment companies. (B) With respect to 75% of its total assets, acquire more than 10% of the outstanding voting securities of any issuer; provided that this limitation does not apply to obligations issued or guaranteed as to interest or principal by the U.S. government or its agencies or instrumentalities or to securities issued by other investment companies. Under current law, shareholder approval would be required for the Fund to resume operating as a non-diversified fund.
In connection with the Fund’s transition to operating as a diversified fund, ‘Non-diversified risk’ has been removed from the Fund’s principal risks.
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 and the Fund’s next prospectus, which we expect to be available by September 1, 2026, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or     
ETFs-Product@franklintempleton.com.
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 and the Fund’s next prospectus, which we expect to be available by September 1, 2026, 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-documentshttps://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.