Is my packet capture uploaded anywhere?

No. The whole tool runs in your browser through a local WebAssembly engine — your capture never touches a server. Open your browser's DevTools Network tab and you will see nothing leave the page. That matters because captures are full of internal IPs, hostnames, and sometimes credentials.

How do I get a packet capture without Wireshark?

You often already have one, or can make one without installing anything. On Windows 10/Server 2019+, pktmon is built in: run `pktmon start --capture`, reproduce the issue, `pktmon stop`, then `pktmon pcapng PktMon.etl -o cap.pcapng`. On Linux/macOS, use tcpdump. Network gear, firewalls, and cloud VPC traffic mirroring also export pcap/pcapng.

Is this a full replacement for Wireshark?

No. Desktop Wireshark is free, local, and ships thousands of dissectors. This is a privacy-first triage analyzer for the common-case protocols (Ethernet, IP, TCP/UDP, DNS, HTTP, TLS, DHCP and more) — for when you cannot or do not want to install software but still need to read a capture quickly and privately. There is no live capture; you bring the file.

What is the largest capture I can open?

The drop zone accepts captures up to 256 MB — a tested ceiling for a 32-bit WebAssembly engine that holds the file plus a packet index in memory. There is no server-imposed limit; the bound is your device's memory. The packet list is virtualized (up to 1 million rows) so scrolling stays smooth, and you can apply a display filter to narrow a larger capture.

It shows the TLS handshake, including the Server Name (SNI) and certificate details, which is enough to identify most encrypted sessions. Decrypting TLS application data with a keylog file is on the roadmap; it is not yet available.

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PCAP Analyzer Tip

Follow the stream

Select a TCP or UDP packet and hit Follow stream to reassemble the whole conversation, client and server colored separately.

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