PCAP Decoder Online

A fast offline PCAP decoder that analyzes captures, reveals per-packet metadata, and exports results for security researchers and network engineers.

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1,500+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how PCAP Decoder Online processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool analyzes offline PCAP/PCAPNG captures to produce structured, per-packet insight. It focuses on solving the needs of network engineers and security analysts who require fast interpretation of captures without local software.
Core dissectors cover Ethernet, IP, TCP/UDP, ARP, DNS, HTTP, TLS and other common protocols. For each packet, it reports timestamp, source and destination addresses, protocol, length, and a concise protocol decode when available.
Outputs include a detailed packet list, session flows, protocol breakdown, and summary statistics. Results can be exported in JSON, CSV, or PCAP to integrate with existing workflows and SIEMs.
The tool operates offline on the uploaded file; it does not decrypt encrypted payloads and does not perform live capture. It provides filters and time-window options to focus analysis and improves efficiency for analysts.

Save your calculation history with a free account

How to Use

Upload a PCAP file or paste a hex dump into the input area.
Optionally apply a protocol_filter or time_range to narrow the scope.
Click Decode to run the analysis and generate per-packet details and summaries.
Review the per-packet list, flows, and protocol breakdown; identify sessions of interest.
Export results as JSON, CSV, or PCAP for integration with tools or reports.
Optional: apply advanced options like time-windowing or reassembly for deeper insights.

Frequently Asked Questions

Find Quick Answers

Which PCAP formats are supported?

The tool supports standard PCAP and PCAPNG captures. It detects common link-layer types automatically and applies appropriate dissectors. If a file contains corrupted records, affected packets are skipped and logged for follow-up.

Can encrypted payloads be decrypted?

No. Decrypting TLS/SSL requires keys and application context. The decoder interprets fields from unencrypted payloads and known protocol structures, but cannot decrypt protected data by default.

How are large captures handled?

Large files are processed in streaming chunks to manage memory usage. For very large captures, users should apply time or protocol filters, or split the file to obtain timely results.

Where can I export results?

Exports are available as JSON, CSV, and PCAP. The tool includes per-packet records, protocol breakdown, and session summaries; users can save filtered views or full results for downstream analytics.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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