20 MB GPX sample
A GPX file of exactly 20,971,520 bytes. It is a valid GPS Exchange Format file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy GPX file.
Download
sample-gpx-20mb.gpx
20 MB20,971,520 bytes
Download 20 MB GPXCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- application/gpx+xml
- SHA-256
d361f76aabe16a493c5751a23b7a5d1248e866b2abd6bd98ef5567a2ce571b28- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
A GPX 1.1 file with metadata, one waypoint and a track of 206,177 points five seconds apart, each with elevation and a UTC timestamp. An XML comment before the closing tags brings the file to the exact size.
| Track points | 206,177 |
|---|---|
| Waypoints | 1 |
| GPX version | 1.1 |
| Interval | 5 seconds |
| Encoding | UTF-8 (ASCII characters only) |
How the file begins
The opening lines of sample-gpx-20mb.gpx, exactly as they appear in the file.
00000000 3c 3f 78 6d 6c 20 76 65 72 73 69 6f 6e 3d 22 31 |<?xml version="1|
00000010 2e 30 22 20 65 6e 63 6f 64 69 6e 67 3d 22 55 54 |.0" encoding="UT|
00000020 46 2d 38 22 3f 3e 0a 3c 67 70 78 20 76 65 72 73 |F-8"?>.<gpx vers|
00000030 69 6f 6e 3d 22 31 2e 31 22 20 63 72 65 61 74 6f |ion="1.1" creato|Preview
Creates the file in your browser and shows the first 64 KB of it.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Finding the first upload limit in a new stack
- Testing activity upload in fitness and mapping apps
- Checking distance, speed and elevation calculations
Testing notes for GPX
- Devices add heart rate, cadence and temperature in extension elements from other namespaces. A parser must skip what it does not recognise.
- GPX writes latitude before longitude, the opposite of GeoJSON and KML. Converters that copy the numbers across without swapping them put tracks in the wrong place.
Technical details
| File name | sample-gpx-20mb.gpx |
|---|---|
| Format | GPX (GPS Exchange Format) |
| Extension | .gpx |
| MIME type | application/gpx+xml |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Text |
| SHA-256 | d361f76aabe16a493c5751a23b7a5d1248e866b2abd6bd98ef5567a2ce571b28 |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | GIS |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-gpx-20mb.gpx # Linux
shasum -a 256 sample-gpx-20mb.gpx # macOSOn Windows, run Get-FileHash sample-gpx-20mb.gpx -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB GPX file?
- A GPX 1.1 file with metadata, one waypoint and a track of 206,177 points five seconds apart, each with elevation and a UTC timestamp. An XML comment before the closing tags brings the file to the exact size.
- What do the GPX samples contain?
- One waypoint and one track with a single segment: a fictional walk that starts in Lisbon, with a point every five seconds, each carrying an elevation and a UTC time.