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Shareholder Report
 6 Months Ended
Jan. 31, 2026
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 Jan. 31, 2026
Shareholder Report Annual or Semi-Annual semi-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 semi-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 January 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.
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 Municipal High Yield ETF
$64
1.23%
[1],[2]
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.23%
Net Assets $ 543,227,642
Holdings Count | $ / shares 441
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$543,227,642
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
441
Portfolio Turnover Rate
14%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [3],[4]
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.  
[4]
† Certain categories may represent less than 0.1%.