v3.26.3
Shareholder Report
 12 Months Ended
Aug. 31, 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 Aug. 31, 2026
Shareholder Report Annual or Semi-Annual annual shareholder report
Putnam Focused Large Cap Growth ETF  
Shareholder Report [Line Items]  
Fund Name Putnam Focused Large Cap Growth ETF
Class Name Putnam Focused Large Cap Growth ETF
Trading Symbol PGRO
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam Focused Large Cap Growth ETF for the period September 1, 2025, to August 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 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 Focused Large Cap Growth ETF
$50
0.48%
[1]
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.48%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended August 31, 2026, Putnam Focused Large Cap Growth ETF returned 10.41%. The Fund compares its performance to the Russell 1000 Growth Index, which returned 10.82% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
Overweight position in:
↑
Snowflake, a cloud-based artificial intelligence data platform company
↑
Advanced Micro Devices, a semiconductor company
↑
Lam Research, a semiconductor equipment company
Top detractors from performance:
↓
Overweight position in ServiceNow, a cloud computing software company
↓
Overweight position in Corning, a glass, ceramics, and concrete manufacturer
↓
Underweight position in Alphabet, a technology company
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 August 31, 2026
 
1 Year
5 Year
Since Inception
(5/25/2021)
Putnam Focused Large Cap Growth ETF (NAV)
10.41
10.28
12.77
Russell 3000 Index
20.10
11.80
12.77
Russell 1000 Growth Index
10.82
11.88
14.05
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.
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 $ 212,109,638
Holdings Count | $ / shares 40
Advisory Fees Paid, Amount $ 446,070
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of August 31, 2026)
Total Net Assets
$212,109,638
Total Number of Portfolio Holdings
40
Total Management Fee Paid (based on a unitary fee)
$446,070
Portfolio Turnover Rate
18%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of August 31, 2026)
Portfolio Composition* (% of Total Investments)
image
 [2]
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]
* Does not include derivatives, except purchased options, if any.