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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 Pennsylvania Municipal Income ETF  
Shareholder Report [Line Items]  
Fund Name Franklin Pennsylvania Municipal Income ETF
Class Name Franklin Pennsylvania Municipal Income ETF
Trading Symbol FTPA
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Pennsylvania Municipal Income ETF (previously known as Putnam Pennsylvania 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 Pennsylvania Municipal Income ETF
$39
0.76%
[1],[2]
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76%
Net Assets $ 82,222,988
Holdings Count | $ / shares 87
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of November 30, 2025)
Total Net Assets
$82,222,988
Total Number of Portfolio Holdings
87
Portfolio Turnover Rate
11%
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.