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Shareholder Report
 12 Months Ended
Apr. 30, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Putnam ETF Trust
Entity Central Index Key 0001845809
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Putnam Emerging Markets Ex-China ETF  
Shareholder Report [Line Items]  
Fund Name Putnam Emerging Markets Ex-China ETF
Class Name Putnam Emerging Markets Ex-China ETF
Trading Symbol PEMX
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam Emerging Markets Ex-China ETF for the period May 1, 2025, to April 30, 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.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
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 YEAR? (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 Emerging Markets Ex-China ETF
$91
0.70%
[1]
Expenses Paid, Amount $ 91
Expense Ratio, Percent 0.70%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended April 30, 2026, Putnam Emerging Markets Ex-China ETF returned 61.18%. The Fund compares its performance to the MSCI Emerging Markets ex-China Index-NR, which returned 61.21% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Overweight position in Elite Material
↑
Overweight position in Asia Vital Components
↑
Not owning HDFC Bank
Top detractors from performance:
↓
Overweight position in ICICI Bank
↓
Not owning Delta Electronics
↓
Overweight position in Indian Hotels
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended April 30, 2026
 
1 Year
Since Inception
(5/17/2023)
Putnam Emerging Markets Ex-China ETF (NAV)
61.18
31.37
MSCI All Country World ex-U.S. Index-NR
32.20
17.77
MSCI Emerging Markets ex-China Index-NR
61.21
25.40
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date May 01, 2025
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236 or visit
https://www.franklintempleton.com/investments/options/exchange-traded-funds.
Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets $ 19,718,616
Holdings Count | $ / shares 53
Advisory Fees Paid, Amount $ 111,151
Investment Company Portfolio Turnover 78.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of April 30, 2026)
Total Net Assets
$19,718,616
Total Number of Portfolio Holdings
53
Total Management Fee Paid (based on a unitary fee)
$111,151
Portfolio Turnover Rate
78%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of April 30, 2026)
Portfolio Composition* (% of Total Investments)
image
 [2]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective July 1, 2025, the Fund’s all-inclusive management fee was reduced from 0.85% to 0.69%.
This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by September 1, 2026, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or     
ETFs-Product@franklintempleton.com.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by September 1, 2026, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or     ETFs-Product@franklintempleton.com.
Updated Prospectus Phone Number (800) DIAL BEN/342-5236
Updated Prospectus Email Address ETFs-Product@franklintempleton.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documentshttps://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
* Does not include derivatives, except purchased options, if any.