Upload PCAP files and view packet summaries: protocol distribution, top talkers, connection pairs, and flow statistics.
This tool reads an uploaded .pcap file directly in your browser and walks its packet records to build four summaries: protocol distribution, top talkers by traffic volume, connection pairs grouped by source and destination, and basic flow statistics. It only decodes header fields - Ethernet, IP, TCP/UDP - so it does not reconstruct sessions or reveal payload content. The most common surprise: if the capture was recorded with a reduced snap length, the captured-length bytes it sums can be smaller than the true on-wire size, so traffic volumes can under-report actual bandwidth.
The tool walks the file's per-packet records - each carrying a captured length and an original length - and decodes just enough of the Ethernet/IP/TCP/UDP headers to identify protocol, source and destination addresses, and ports. Bytes past the transport header are not interpreted, so contents of HTTP requests, TLS records, or other application data are never extracted or displayed.
As packets are parsed, running totals are kept per host for the top-talkers view and per source/destination/port/protocol tuple for connection pairs. Protocol distribution counts are tallied from the identified transport or application protocol on each packet, and flow statistics summarize packet counts, byte totals, and capture duration from the first and last packet timestamps.
No. It only reads packet headers to identify protocols and endpoints; encrypted application data stays opaque. Decoding TLS content would require the session keys and a full protocol decoder, which this tool does not attempt.
No - it runs entirely in your browser and the file is parsed locally, so nothing is sent to a server. Closing or refreshing the tab discards the loaded capture and its summary.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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