You can upload any GPX, TCS, FIT files or ZIP or GZ files containing them.
For Strava:
- Log into your Strava account.
- Click your avatar picture on the top right.
- Click "Settings".
- On the left choose "My Account".
- Scroll down and below "Download your account" click "Get Started".
- On the next page click "Request download". After a while you will receive a link where you can download your activitites by email.
- Upload the file below and click "Load selected files".
All your data will remain in this browser, no data is processed or stored on our servers.