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Shareholder Report
 6 Months Ended
Oct. 31, 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 Oct. 31, 2025
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Putnam BioRevolution™ ETF  
Shareholder Report [Line Items]  
Fund Name Putnam BioRevolution™ ETF
Class Name Putnam BioRevolution™ ETF
Trading Symbol SYNB
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam BioRevolution™ ETF for the period May 1, 2025, to October 31, 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*,†
Putnam BioRevolution™ ETF
$37
0.69%
[1],[2]
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.69%
Net Assets $ 4,664,616
Holdings Count | $ / shares 33
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of October 31, 2025)
Total Net Assets
$4,664,616
Total Number of Portfolio Holdings
33
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of October 31, 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.