The FitFileLab blog
Practical guides to open, convert, repair and manage your GPX, FIT and TCX activity files.
- Editing
How to edit a GPX file online: track, name, sport and date
How to edit a GPX file: fix the track, change the name, sport or date of an activity. Free browser editor, no sign-up.
Read article → - Editing
How to trim a GPX track: cut the start or the end
How to cut the start or end of a GPX, FIT or TCX track to remove the drive home, the warm-up or a forgotten stop. Free, in your browser.
Read article → - Editing
How to merge two GPX files into one (free, online)
How to merge several GPX, FIT or TCX files into a single continuous activity. Free browser tool, no upload, no sign-up.
Read article → - Formats
How to open a GPX file on PC, Mac and mobile (no software)
How to open and read a GPX file on Windows, Mac, iPhone or Android. View the track on a map right in your browser, for free.
Read article → - Pace
How to use a running pace calculator
How to use a pace calculator to convert time, distance and pace, and hit the right rhythm on 5K, 10K, half and marathon.
Read article → - Analysis
How to build your own heatmap from GPX/FIT files
How to generate your own training heatmap from your GPX, FIT or TCX activities. Free, in the browser, no account or upload.
Read article → - Analysis
How to compare two GPS activities side by side (free)
How to compare two GPX, FIT or TCX activities: overlaid tracks, elevation profiles and stats in parallel. Free browser tool, no sign-up.
Read article → - Routes
How to create a GPX route from scratch (free, in your browser)
How to draw a GPX route by hand, export it and send it to your watch or GPS. Free online editor, no sign-up, everything runs in your browser.
Read article → - Formats
GPX vs TCX vs FIT: the differences and which format to choose
GPX, TCX or FIT: what each activity file format is for, what they contain, and which one to choose depending on your watch, app or need.
Read article → - Conversion
How to convert a FIT file to GPX for free (no upload, no sign-up)
Convert a Garmin, Wahoo or Coros FIT file to GPX in seconds, right in your browser. Free, instant, and your file never leaves your device.
Read article → - Training
What's a good running pace? Average pace by distance and level
Average running paces for 5K, 10K, half marathon and marathon, by level — and how to find the pace that's right for you, with a free calculator.
Read article → - Training
Marathon pace: how to choose it — and hold it for 42.2 km
How to pick a realistic marathon pace from your recent races, why even pacing beats heroics, and the exact splits for every goal from 3h00 to 5h00.
Read article → - Conversion
How to convert a GPX to TCX: the complete guide (free, no sign-up)
Why and how to convert a GPX file to TCX. Free, instant conversion in your browser, no upload, for Garmin, Strava, Wahoo and Coros.
Read article → - Formats
How to open a .FIT file easily (no software needed)
A .FIT file won't open like a GPX or a PDF. Here's how to read, view and convert a Garmin, Wahoo or Coros FIT file right in your browser.
Read article →