You finish the ride, you look at the GPX file your computer spat out, and the actual ride is sandwiched between five minutes of you wheeling out of the garage and ten minutes of you idling at a traffic light eating a banana. The route’s in there — you just want the route.
We’ve put a tool on the website that does exactly that, and only that.
What it does
GPX Trim Tool lets you drop a .gpx file onto the page, see it on the map, and drag a two-handle slider to keep just the section you want. A green pin marks your new start, a red pin marks your new finish, and the part you’re cropping out goes faded so you can see exactly what’s leaving and what’s staying.
When you’re happy with the crop, you can:
- Download the trimmed GPX as a fresh file, or
- Save it as a route on Party Onbici (if you’re logged in) — it goes through the same parser, elevation lookup, and geocoding as a normal upload, so you get the full route page with stats and a shareable link.
It runs entirely in your browser
This is the bit we’re most pleased about. The whole tool is JavaScript: the GPX parser, the trim, the new GPX file it produces — all of it. Nothing is sent to our servers until you click Save. If you just want to download the trimmed file you can do it without an account, without logging in, without us ever seeing your ride.
That matters for a few reasons:
- Your home address. Most GPX files start and end at your front door. Cropping the first and last few hundred metres before you share the file anywhere is just sensible — and now you can do it without uploading anywhere first.
- You’re not logged in. Maybe you’ve found the tool from a search engine and you just need a one-off trim. You shouldn’t need to make an account for that.
- The file is huge. Long rides on a high-rate computer can produce GPX files with tens of thousands of points. Doing the work locally means there’s no upload waiting around.
Why we built the play button
GPX files of out-and-back rides have a particular failure mode on a map: you ride out one way, ride back the same way, and now the line on the map is exactly the same line drawn on top of itself. You can’t tell where you turned around just by looking.
So we added a Play button. Click it and an orange dot animates along the kept portion of your route at about 20 km/s of map distance — fast enough to scan, slow enough to follow. You can see the route unfold, watch the dot reach the turnaround, and watch it come back. If your trim is in the wrong place, you’ll spot it in five seconds.
It’s the kind of thing that sounds like a gimmick until the first time it saves you from saving a ride that ends three streets early.
Some things people will probably do with it
- Crop the warm-up and cool-down before posting a ride to a group.
- Cut the first 500 m so the route doesn’t start at your house.
- Split a long tour into stages by trimming and saving each section separately.
- Tidy up a club ride where the GPS was accidentally left running through lunch.
- Make a clean version of a route to share with a friend or post in a chat.
How to use it
- Open the tool.
- Drop a
.gpxfile onto the page (or click to browse). - Drag the two slider handles inwards until the kept range is what you want. The green and red pins on the map move as you drag.
- Hit Play to confirm the crop.
- Click Download to save the file, or Save as route to put it on your Party Onbici account.
That’s the whole tool.
Where to find it
The tool lives at au.partyonbici.com/routes/tools/gpx-trim/. There’s also a link in the Routes menu in the top nav, in the Company column of the footer, and at the top of the existing route upload page in case you turn up there with a file that needs cropping first.
It works on mobile too — the slider handles are sized for thumbs, and the map gestures behave the way map gestures should.
If you’ve ever sworn at a 50 MB GPX file because the only thing you wanted to do was lop the last two kilometres off the end, this is for you. Let us know what else you’d like trimming tools to do.