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Shareholder Report
 12 Months Ended
Jul. 31, 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 Jul. 31, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Franklin Municipal High Yield ETF  
Shareholder Report [Line Items]  
Fund Name Franklin Municipal High Yield ETF
Class Name Franklin Municipal High Yield ETF
Trading Symbol FTMH
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Franklin Municipal High Yield ETF (previously known as Putnam Tax-Free High Yield Fund) for the period August 1, 2025, to July 31, 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*
Franklin Municipal High Yield ETF
$80
0.77%
[1]
Expenses Paid, Amount $ 80
Expense Ratio, Percent 0.77%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended July 31, 2026, Franklin Municipal High Yield ETF returned 8.82%. The Fund compares its performance to the Bloomberg Municipal Bond Index, which returned 5.27% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Overweight exposure to bonds with no external credit rating
↑
Overweight exposure to bonds rated below investment-grade
↑
Overweight exposure to municipal bonds with 20 or more years to maturity
Top detractors from performance:
↓
Security selection within BBB rated bonds
↓
Underweight exposure to A rated bonds
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 July 31, 2026
 
1 Year
5 Year
10 Year
Franklin Municipal High Yield ETF (NAV)
8.82
1.13
3.01
Bloomberg Municipal Bond Index
5.27
0.51
1.95
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 Aug. 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 $ 566,104,925
Holdings Count | $ / shares 503
Advisory Fees Paid, Amount $ 2,021,126
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of July 31, 2026)
Total Net Assets
$566,104,925
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
503
Total Management Fee Paid (based on a unitary fee)
$2,021,126
Portfolio Turnover Rate
34%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of July 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [2],[3]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective October 24, 2025, Putnam Tax-Free High Yield Fund (the “Predecessor Fund”) was converted into Franklin Municipal High Yield ETF (the “ETF”), which is a newly organized series of Putnam ETF Trust. Pursuant to an Agreement and Plan of Reorganization approved by the Boards of the Predecessor Fund and the ETF, the reorganization of the Predecessor Fund consisted of (1) the transfer of substantially all of the Predecessor Fund’s assets, subject to its liabilities, to the ETF in return for shares of the ETF; and (2) the distribution of the ETF shares to the Predecessor Fund’s shareholders in complete liquidation of the Predecessor Fund. The ETF began trading on NYSE Arca, Inc. on October 27, 2025.
This is a summary of certain changes to the Fund since August 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 December 1, 2026, 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 Name [Text Block] Effective October 24, 2025, Putnam Tax-Free High Yield Fund (the “Predecessor Fund”) was converted into Franklin Municipal High Yield ETF (the “ETF”), which is a newly organized series of Putnam ETF Trust.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since August 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 December 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-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.  
[3]
† Certain categories may represent less than 0.1%.