TDMS file viewer & CSV converter
Open NI TDMS files without LabVIEW or DIAdem, and without installing anything. See the channels and a chart, and save the channels you pick as CSV.
🔒 No upload — the file is read in this browser only
Drop a TDMS file here, or click to pick one
.tdms · up to 400 MB
.tdms · up to 400 MB
What it reads
- TDMS written by LabVIEW, DAQmx and other NI software. Multiple groups, channels at different sample rates, DAQmx raw data with scaling (linear · polynomial · thermocouple · RTD · strain and more), even the last partial chunk of a file that stopped mid-write.
- Several groups are merged into one table on a common time axis. Channels without timestamps get times from wf_increment (the sample interval).
.tdms_indexis an index file — pick the.tdmswith the same name.- Values are handled with about 7 significant digits (single precision) — plenty for charts and measurements, but very long values such as large counters or coordinates may differ in the last digits in the CSV. Empty cells and ±Inf are left blank in the CSV.
- The same TDMS reader the Runplotter program uses.
Bigger files, comparing files, cursor measurements?
Runplotter opens TDMS along with CSV · Excel · MDF · MATLAB · oscilloscope files — a whole folder at once — with per-run charts, two cursors, frequency analysis and an Excel report. A single exe, no install; the free edition has every feature.
Free download →