Can I add GPS overlay to video online without installing software?

Yes. Stamptivity Overlay runs entirely in your browser — no download, no account, no watermark. Open stamptivity.app/overlay, load your video and GPX file, add gauges, and export as MP4. Works on Windows, Mac, and Linux.

What file formats does the online GPS overlay tool accept?

Stamptivity Overlay accepts GPX and FIT files from any GPS device or platform — Garmin, Wahoo, Polar, Coros, Strava, Komoot, Apple Watch, and more. Video input is MP4.

Is the online GPS overlay tool free?

Yes. Stamptivity Overlay is completely free with no watermark, no account required, and no upload limit. Your files never leave your device — all processing happens in your browser.

Does the online GPS overlay work on Mac?

Yes. It works in any desktop browser on macOS — Safari, Chrome, or Firefox — including Apple Silicon Macs. No compatibility layer or Rosetta needed.

Can I use a GPX file from Strava or Garmin?

Yes. Export your activity GPX from Strava (⋯ → Export GPX), Garmin Connect (gear icon → Export to GPX), Wahoo, Komoot, or any other platform that supports GPX export. Load the file directly into Stamptivity Overlay.

GPX to Video Overlay Online — No Install Required

Most GPS video overlay tools require a software download — a Windows installer, a Mac app, sometimes a USB dongle for license verification. If you don't want to install anything, or you're on a computer where you can't install software, a browser-based solution is the practical answer.

Here's how to create a GPX video overlay entirely online, with no install and no account.

Why Use an Online GPS Overlay Tool?

No install: Works on any computer — office machine, borrowed laptop, school computer
No OS restrictions: Same tool works on Windows, Mac, and Linux
No updates: Always the latest version when you open the URL
No storage: Nothing saved to your hard drive
Privacy: Files stay in your browser — nothing uploaded to a server

The Tool: Stamptivity Overlay

stamptivity.app/overlay — Free, browser-based, no account

Open the URL in any desktop browser and you're ready. Chrome, Firefox, Edge, and Safari all work. No plugin, no extension.

What it does:

Accepts GPX and FIT files from any GPS device or tracking platform
Loads your video file locally (never uploaded to a server)
Lets you add speed, heart rate, elevation, cadence, moving map, and elevation chart gauges
Drag gauges to any position on the video frame
Time offset slider to sync GPS data to your video
Exports as MP4 at full resolution — no watermark

Step-by-Step: GPX to Video Overlay Online

Step 1: Get Your GPX File

Export from wherever your GPS data lives:

Platform	How to export GPX
Strava	Open activity → ⋯ → Export GPX
Garmin Connect	Open activity → ⚙ → Export to GPX
Wahoo	Via Wahoo web app or this guide
Komoot	Open tour → Download → GPX
Apple Watch	Via HealthFit or WorkOutDoors app → guide
Coros	Coros app → activity → share → GPX
Polar	Polar Flow app → export GPX

If you have a FIT file instead of GPX (common with Garmin), you can load it directly — no conversion needed.

Step 2: Open Stamptivity Overlay

Go to stamptivity.app/overlay in your desktop browser. Nothing to install.

Step 3: Load Your Video

Drop your video file (MP4) into the video panel, or click to browse. The video plays in the browser — it never leaves your computer.

Step 4: Load Your GPX File

Drop the GPX (or FIT) file into the GPS panel. Data loads immediately:

Speed channel → speed gauge
Heart rate → HR gauge (if recorded in your GPX)
GPS coordinates → map
Elevation → elevation gauge and chart

Step 5: Add Gauges

Click any gauge in the sidebar to add it to the canvas. Gauges available:

Speed — current speed, multiple display styles
Heart Rate — from your GPS device's HRM
Elevation — current altitude or gain
Cadence — if recorded
Map — live route trace with position dot
Elevation Chart — sparkline showing the full climb/descent profile

Drag each gauge to wherever you want it on the video frame.

Step 6: Sync GPS to Video

The GPS file and the video were recorded at different times. Press play, find a moment you can clearly identify — the moment you start moving, pass a known landmark, or reach a junction. Drag the time offset slider until the speed reading and map dot match what you see on screen.

Most sessions sync within 5–10 seconds of adjustment.

Step 7: Export

Click Export. The browser renders the video with all gauges burned in. The download is a standard MP4 — ready for YouTube, Instagram, or any video platform.

No watermark. Full resolution. Free.

What Data Does My GPX Contain?

GPX files can carry different data depending on the source:

Data	Standard GPX	FIT (Garmin)
GPS coordinates	✓	✓
Elevation	✓	✓
Speed	Calculated from GPS	✓ (sensor)
Heart rate	Sometimes	✓
Cadence	Rarely	✓
Power	✗	✓

For the richest overlay (heart rate, cadence, power), use a FIT file from Garmin Connect ("Export Original") rather than a GPX export. Stamptivity accepts FIT files directly — no conversion needed.

Other Online GPS Overlay Tools

GpxOverlay (gpxoverlay.com) — Browser-based, 29+ gauge types, free tier has watermark and resolution limit, paid plans from ~€4/month.

Stamptivity Overlay is the only fully free browser-based option with no watermark, no resolution limit, and no account required.

Tips

Speed vs. FIT for heart rate: Most GPX exports from Strava drop heart rate. For HR in your overlay, use a FIT file from Garmin Connect ("Export Original") or export from your device directly.
Large video files: The browser handles files up to several GB, but a faster machine and modern browser (Chrome 120+) give smoother scrubbing on longer clips.
Multiple gauges: Adding too many gauges makes the overlay hard to read. Three or four well-placed gauges work better than eight small ones.
For stats photos (not video): Use Stamptivity Stamp with the same GPX file to create a shareable activity stats image.

Open Stamptivity Overlay → — no install, no account, free.