NeverChill

29 free tools

Free training tools for cyclists & runners

Calculators, file converters, route tools, and a complete FIT file toolkit - all free, all in your browser. No signup. Your files stay on your device.

Featured · Free toolkit

Free FIT File Tools - 14 tools, zero uploads.

View, convert, merge, trim, repair, and anonymize any Garmin FIT file in your browser.

Explore the toolkit

FIT File Tools

14 tools

14 tools to view, edit, fix, and convert FIT, GPX, and TCX files - in your browser, zero uploads.

file
.fit
file
.gpx
file
.tcx
One-click conversion

ride.fitbecomesride.gpx

FIT File Tools

FIT to GPX to TCX Converter

Any format in. Any format out.

Open tool
Tue 14 May
Sat 18 May

started 2024-03-11 07:02becomesstarted today 06:30

FIT File Tools

FIT Time Adjuster

Fix the clock without re-doing the workout.

Open tool
CyclingRunning

sport: genericbecomessport: cycling

FIT File Tools

FIT Sport Changer

Tell every platform what you actually did.

Open tool
GARMIN
WAHOO
SUUNTO
COROS

0F A3 21 B7becomesGarmin Edge 840

FIT File Tools

FIT Device Changer

Tell the file which device it came from.

Open tool
0
m
Elevation set
Re-baselined

altitude: nonebecomesaltitude: 412 m

FIT File Tools

FIT Elevation Setter

Fix flat trainer rides or noisy phone tracks.

Open tool
Today · 07:00
Tomorrow · 07:00
Clone

ride.fit, 11 Marbecomescopy.fit, today

FIT File Tools

Clone and Retime

Re-stage any ride for any clock.

Open tool
Section cut
Stitched clean

84.2 kmbecomes71.6 km

FIT File Tools

FIT Section Remover

Snip out the part of the ride you don't want.

Open tool
Breaks detected
-22:14 idle

3:12:40 elapsedbecomes2:48:05 moving

FIT File Tools

FIT Break Remover

Cut the coffee stop, keep the ride.

Open tool
Outlier 1842 W
Capped at 420 W

1842 Wbecomescapped 420 W

FIT File Tools

FIT Peak Remover

Kill the bogus spikes, keep everything else.

Open tool
Original start
Pre-roll added

starts at 0.0 kmbecomesstarts at -1.2 km

FIT File Tools

FIT Start Extender

Backdate the start to a real coordinate.

Open tool
0
→ 1
Files merged
Stitching segments

3 filesbecomes1 activity

FIT File Tools

FIT Combiner

Merge 2+ files into one activity, in your order.

Open tool
HR
Power
Streams merged

power: nonebecomespower: 248 W

FIT File Tools

FIT Field Merger

Patch missing streams from a parallel recording.

Open tool
activity.fitdecoded
0F A3 21 B7 4Ctimestamp: 2026-06-02T10:32:14Z
12 8A 64 02 1Fposition_lat: 51.5074
04 71 9E 33 88position_lng: -0.1278
0A 22 4D 6E 91altitude: 142.6 m
7E 55 03 9C 41heart_rate: 152 bpm
88 1D B4 E2 0Fpower: 248 W
3C C9 76 18 5Bcadence: 92 rpm
20 81 4A E6 7Dtemperature: 18 C
Bytes decoded

0F A3 21 B7becomesrecordMesgs: 8,412

FIT File Tools

FIT Inspector

Read-only deep dive on what's actually in your FIT.

Open tool
Course · 4 turns
Turn-by-turn FIT course

route.gpxbecomescourse.fit

New

FIT File Tools

GPX to FIT Course Converter

GPX in, navigable .fit course out.

Open tool

Cycling

5 tools

FTP, power-to-weight, TSS - the cycling math that drives every training decision.

0
W
20 min
0
W
FTP
duration →
watts ↑

20 min at 265 WbecomesFTP 252 W

Cycling

FTP Estimator

20-min test or ramp test, then zones.

Open tool
Coggan W/kg tiers
Cat 5
Cat 4
Cat 3
Cat 2
Cat 1
WC
Your number
4.2
W / kg
Cat 2

252 W, 68 kgbecomes3.71 W/kg

Cycling

Power-to-Weight Ratio Calculator

Watts per kilogram for every duration.

Open tool
90:00
0:0045:0090:00
0
TSS
0
IF

2:15 at 218 NPbecomesTSS 118

Cycling

TSS Calculator

TSS, IF, and intensity band per ride.

Open tool
Saddle height
75.4cm
LeMond · 0.883
Inseam → saddle height

inseam 82 cmbecomessaddle 71.7 cm

New

Cycling

Saddle Height Calculator

Inseam in. Saddle height out.

Open tool
carbs
fluid
salt
Bottle 1
Gel
Bottle 2
Gel
Food
Bar
0h1h2h3h4h+

4 h at 210 Wbecomes72 g carbs/h

New

Cycling

Endurance Fueling Planner

Carbs, fluid, salt - hour by hour.

Open tool

Running

5 tools

Pace, race time, VO2 max - the running calculators that turn a watch into a plan.

5K24:30
10K50:00
Half1:45:00
Full3:40:00

10 km in 47:30becomes4:45 /km

Running

Running Pace Calculator

Pace, time, distance - three ways.

Open tool
5K22:0010K45:34Half1:41:09Marathon3:31:02Predicted time
Your race

10 km in 47:30becomesmarathon 3:39

Running

Race Time Predictor

Riegel projections across all race distances.

Open tool
0204060 ml/kg/min
VO254

5 km in 22:10becomesVO2max 46.8

Running

VO2 Max Estimator

Race, Cooper, or Rockport - your aerobic ceiling.

Open tool
Goal pace bands4:30 /km 4:45 /km 5:00 /km 5:15 /km 5:30 /km 5:45 /km 6:00 /km 6:15 /km 6:30 /km 6:45 /km 7:00 /km 7:15 /km

Goal pace

5:00/km

sub-3:00 marathonbecomes4:15 /km splits

Running

Marathon Pace Charts

Even-split tables for any race distance.

Open tool
Actual pace
5:30/km
GAP
5:02/km
Grade-adjusted pace

7:40 /km at 6%becomes6:12 /km flat

New

Running

Grade-Adjusted Pace Calculator

What your pace would be on flat ground.

Open tool

Utility

5 tools

Cross-sport calculators and viewers that work for runners and cyclists alike.

GPX preview
0
km
Distance

ride.fitbecomesmap, charts, laps

Utility

GPX & FIT File Viewer

Open .fit, .gpx, .tcx files in one click.

Open tool
Z1Recovery95-114 bpm Z2Endurance115-135 bpm Z3Tempo136-155 bpm Z4Threshold156-170 bpm Z5VO2 max171-190 bpm
148 bpm

max 186 bpmbecomesZ2 130-148 bpm

Utility

Heart Rate Zone Calculator

Karvonen and LTHR-based zones.

Open tool
km
62.4
elev
820
time
2:18
NeverChill
1080 × 1920 story

ride.fitbecomes1080x1920 .png

New

Utility

Activity Share Card Generator

1080x1920 PNG, ready for stories.

Open tool
Privacy trimmed
Hide home · scrub metadata

home: 51.5074, -0.1278becomeshome: hidden

New

Utility

GPX Privacy Stripper

Trim the start and end, scrub the metadata.

Open tool
10,500500points
Douglas-Peucker decimation

8,412 pointsbecomes500 points

New

Utility

Route Simplifier

Fewer points. Same route.

Open tool

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