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Shareholder Report
 6 Months Ended
Nov. 30, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Putnam ETF Trust
Entity Central Index Key 0001845809
Entity Investment Company Type N-1A
Document Period End Date Nov. 30, 2025
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Franklin New Jersey Municipal Income ETF  
Shareholder Report [Line Items]  
Fund Name Franklin New Jersey Municipal Income ETF
Class Name Franklin New Jersey Municipal Income ETF
Trading Symbol FTNJ
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin New Jersey Municipal Income ETF (previously known as Putnam New Jersey Tax Exempt Income Fund) for the period June 1, 2025, to November 30, 2025.
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.
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 SIX MONTHS? (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 New Jersey Municipal Income ETF
$36
0.70%
[1],[2]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.70%
Net Assets $ 140,096,175
Holdings Count | $ / shares 136
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of November 30, 2025)
Total Net Assets
$140,096,175
Total Number of Portfolio Holdings
136
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of November 30, 2025)
Portfolio Composition* (% of Total Investments)
image
 [3]
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]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.