Convert Garmin Edge, Forerunner, Wahoo ELEMNT, and Strava FIT activity recordings into clean, structured CSV spreadsheets for Microsoft Excel, Google Sheets, and sports analytics directly in your browser. 100% private with zero server uploads.
Detailed side-by-side format architecture for FIT Document (.fit) and Comma-Separated Values (.csv). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .fit file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .csv directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert FIT to CSV locally
pandoc input.fit -o output.csvWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
The FIT (Flexible and Interoperable Data Transfer) protocol is the standard binary format created by Dynastream/ANT+ and used by Garmin (Edge, Forerunner, Fenix), Wahoo Fitness (ELEMNT, BOLT), Hammerhead Karoo, Bryton, Coros, Zwift, TrainerRoad, and Strava.
Every recorded trackpoint is decoded into a dedicated row containing: ISO 8601 Timestamp, Latitude (degrees), Longitude (degrees), Altitude (meters), Cumulative Distance (meters), Heart Rate (BPM), Cadence (RPM), Power (Watts), Speed (km/h), and Temperature (°C).
In the FIT specification, unrecorded or missing sensor values are flagged with maximum sentinel integers (such as 0xFF or 0xFFFF). convrtr automatically filters out these sentinels and outputs clean, blank CSV cells rather than corrupting your graphs with unrealistic spikes.
Yes. Fitness and GPS tracking files reveal exact home locations, daily routines, and physiological metrics. convrtr processes your FIT file completely in-memory inside your browser client. No GPS coordinates or activity data are ever transmitted to any cloud or third-party server.
FIT Document (FIT) and Comma-Separated Values (CSV) serve distinct roles across the digital workflow. Converting to CSV provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (CSV) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .fit files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Deep dive into Garmin's Flexible and Interoperable Data Transfer (FIT) binary protocol, decoding record definitions and CRC validation, and converting fitness trails to GeoJSON and CSV.