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Shareholder Report
 6 Months Ended
Feb. 28, 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 Feb. 28, 2025
Putnam Sustainable Future ETF  
Shareholder Report [Line Items]  
Fund Name Putnam Sustainable Future ETF
Class Name Putnam Sustainable Future ETF
Trading Symbol PFUT
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Sustainable Future ETF for the period September 1, 2024, to February 28, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
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*,†
Putnam Sustainable Future ETF
$31
0.64%
[1],[2]
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.64%
Net Assets $ 325,633,110
Holdings Count | $ / shares 84 [3]
Investment Company Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2025)
Total Net Assets
$325,633,110
Total Number of Portfolio Holdings*
84
Portfolio Turnover Rate
26%
[3]
Holdings [Text Block]
image
 [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]
* Includes derivatives, if applicable.
[4]
Cash and Equivalents, if any, represent the market value weights of cash, derivatives, and short-term securities in the portfolio. Unclassified assets, if any, represent ETFs and other holdings that can’t be classified by sector. Holdings and allocations may vary over time.