UDS trace viewer

Drop a CAN trace from a diagnostic or flash session. The viewer reassembles ISO-TP, pairs every request with its response, and tells you where it went wrong: the negative response, the timeout or the broken block counter, with the frames that show it.

Parsed in your browser. Your trace never leaves this page.

Drop a trace file here or choose one

Vector BLF and ASC, PEAK TRC 1.x/2.x, ASAM MF4 bus logging, Wireshark pcap/pcapng (SocketCAN), candump log, SavvyCAN or python-can CSV.

Or try an example: ·

Paste a trace instead

Trace not read correctly, or a format missing? Tell us; it goes straight to the maintainer.

Use it from ChatGPT, Claude or Cursor

The same analysis runs as the analyze_trace tool on the free UDS Toolbox MCP server. In ChatGPT the result opens as this viewer; ask follow-up questions about any request in plain language.