How to open a GPX file on an iPhone

The short answer

iOS has no default app tied to the .gpx extension, so tapping one in Files, Mail or Messages does not open a map the way tapping a photo opens the Photos app. What actually opens is Quick Look, the system's built-in file preview, and because a GPX file is plain-text XML underneath, Quick Look shows the raw tags and numbers rather than a map. That preview is not the real "open" action. Turning a .gpx file into an actual route on an iPhone means handing it, through the share sheet, to an app that specifically knows how to read GPX — the same step a GPX file needs on a computer when no mapping tool is installed, just with fewer fallback options along the way.

Why there is no built-in viewer for this

An iPhone ships with a working viewer for photos, PDFs, plain text and the common office formats because those cross a threshold: enough apps produce them, and enough people open them, that Apple builds the interpreter into the operating system itself rather than leaving it to whichever app happens to be installed. GPX never crosses that threshold. It is a specialised format — an XML structure holding a sequence of coordinates — used by a fairly narrow category of outdoor and mapping apps, and read by almost nothing else on the phone. That is not an oversight, and it is the same reason a spreadsheet app on a computer does not understand a .gpx file without something translating it first: the operating system only bundles a reader for a format once enough of what runs on it actually needs one.

What actually happens when you tap one

In the Files app

Tapping a .gpx file in Files opens Quick Look, the system's built-in file preview. Quick Look treats a GPX file as what it technically is — a plain-text XML document — and shows the raw tags and numbers directly, the same angle-bracket structure a text editor shows on a computer, rather than a map. That is not the phone failing to open the file; it is Quick Look correctly rendering exactly the kind of file this is.

As a Mail or Messages attachment

A .gpx file arriving as an email or message attachment behaves the same way once tapped — a preview screen, not an app opening automatically, because nothing on the phone has registered itself as the default for that extension. The one difference worth knowing is that some mail services rewrite an unfamiliar attachment type on the way through, which occasionally turns a .gpx file into something ending in .xml or .txt by the time it lands, still readable as text but no longer recognised by an app expecting the original extension.

The share sheet, not the preview

The actual way to open a .gpx file on an iPhone is the small share icon on that preview screen, which lists every installed app that has told iOS it can handle the file. If a mapping or hiking app that reads GPX is installed, it shows up there and importing the file into it is what finally draws a route instead of a page of text. If nothing installed reads GPX, that list simply has nothing useful in it — not a sign anything went wrong, just the honest state of not having an app for the job yet.

Things that trip people up

• Tapping the file and expecting a map — Quick Look shows the raw XML tags a GPX file is built from, never a drawn route. A route only appears once the file has been handed to an app built to read GPX.
• Seeing a wall of angle-bracket tags and assuming the file is broken or empty — that is Quick Look correctly displaying a plain-text file exactly as it is, which says nothing about whether the points inside it are valid.
• An attachment that opens as gibberish or will not open at all — usually a mail service silently changed the file extension in transit, which is enough to stop iOS offering the right handling for it even though the underlying text survived intact.
• Assuming the share sheet is empty because the file is unsupported — it is empty, or nearly empty, whenever no installed app has registered itself for GPX files, which is a statement about what is on the phone, not about the format or the file.

Where TrailCam fits in

TrailCam reads a .gpx file handed to it through the iPhone share sheet, or through an import option inside the app itself, and turns it into a route in your history the same way a walk it recorded directly becomes one — distance, duration, pace and elevation gain worked out from the points in the file. That makes TrailCam one of the apps that shows up in the share sheet once it is installed, which is the actual fix for a .gpx file that otherwise just sits there as text on an iPhone. TrailCam is free to download.