OmniConvert

Convert NMEA to GeoJSON

Convert a raw NMEA 0183 GPS log to a GeoJSON LineString track

Drop a file or click to browse

Accepted: .nmea,.nma,.txt,.log

or paste below

Free and unlimited for files up to 5 MB. No account needed.

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About this conversion

Convert a raw NMEA 0183 GPS log to a GeoJSON LineString track. This converter processes your NMEA log file server-side and returns a GeoJSON file instantly — no account, no software installation, and no file storage. Files are deleted from our servers immediately after conversion.

How to convert NMEA log to GeoJSON

  1. 1. Upload — drag your NMEA log file onto the converter above, or click to browse.
  2. 2. Convert — press Convert. Processing happens on secure servers in seconds.
  3. 3. Download — your GeoJSON file downloads automatically. No sign-up required.

Convert NMEA log to GeoJSON from the command line

curl --fail-with-body \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -F "file=@input.nmea" \
  -F "conversionId=nmea-to-geojson" \
  https://www.omniconvert.cloud/api/convert -o output.geojson

The API needs a token from a credit pack, and each API conversion uses one credit. Converting on this page stays free. API documentation

Frequently Asked Questions

Which NMEA sentences are read?
Position fixes come from RMC sentences (position, speed, course and date) and GGA sentences (position, altitude, satellites and HDOP), from any talker: $GP (GPS), $GN (multi-constellation), $GL, $GA and $BD. RMC and GGA sentences with the same time are merged into one point. Sentences without a valid fix or with a wrong checksum are skipped, and other sentences such as GSV or VTG are ignored.
Why do some points have no time?
Only RMC sentences carry the date. Points are given a full UTC timestamp from the first RMC sentence on; a log with only GGA sentences has positions and altitudes but no timestamps.
How do I convert NMEA log to GeoJSON?
Upload your NMEA log file above, click Convert, and download the GeoJSON result instantly. No account or software needed.
Is converting NMEA log to GeoJSON free?
Yes. It is free and unlimited for files up to 5 MB, with no account required. Larger files get 3 free conversions per day; beyond that, credit packs start at $3 and credits never expire.
Are my files stored or shared?
No. Files are processed in server memory and deleted immediately after conversion. File contents are never written to disk or retained.
Do I need to install anything?
No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

No account needed · Credits never expire · Share your token link across devices