Performance testing tools for JMeter, k6 and Gatling
Turn a browser recording into a runnable script, convert between all three tools in any direction, read a results file, or check what a script is about to leak. All free, all in your browser — your script is never uploaded.
Start with the thing that's broken
Three jobs that normally mean installing something, uploading something, or opening a GUI you were trying to avoid. Each one runs in the tab.
Turn a HAR recording into a JMeter test plan
Record a journey in Chrome DevTools, save the HAR, get a runnable JMeter test plan back. A HAR holds every header and cookie of a real session, which is why this one never uploads it.
Open itConvert a JMeter script to k6
Grafana archived their own converter in 2022 and everything else is a command-line tool you install first. Drop the .jmx in and read the k6 before you commit to the migration.
Open itOpen a .jtl results file and read the report
Open a .jtl or a k6 JSON file and read the summary, the percentiles and the errors — without launching the JMeter GUI on a results file it cannot hold in memory.
Open itPerformance Tools
Purpose-built software for performance testing professionals.
Or I'll migrate them for you
Fixed price, agreed before anything starts, delivered in working days. No discovery call, no day rate, no meetings — you send sanitised scripts and get them back converted, with everything that still needs a human listed and explained.
Conversion review
£250
1 working day
One script, any size
Single script
£750
3 working days
Up to 50 HTTP requests and 10 manual-work items
Suite
£1,500
5 working days
Up to 200 HTTP requests and 30 manual-work items
Larger migrations
From £3,000
Agreed with you
No cap — scope agreed up front
Try it on a file you already have
A recording, a test plan, or a results file you have never been able to open without the GUI. It converts in the browser tab — the page cannot make a network call, so nothing you drop on it is uploaded anywhere.