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SmartSniff

Free#28 of 31 in Network Packet Analyzer Software

SmartSniff: A free, focused Windows utility for TCP/IP conversations, filtering, exports, and HTTP extraction. Ranked #28 of 31 in Network Packet Analyzer Software by our editors (5.8/10); pricing: Free plan; best for basic Windows TCP conversation capture.

5.8/10Editor score

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At a glance

Editor score
5.8 / 10
Pricing
Free plan
Best for
Basic Windows TCP conversation capture
Free plan
Yes
Paid from
Free
Operating systems
Windows 98/ME/NT/2000/XP/2003/2008/Vista/7/8
Founded
2001
Facts checked
21 Sep 2026

Where it wins
- Freeware with live TCP/IP capture and conversation views
- Filters, HTTP extraction, process information, and export options
- Portable operation with command-line capture support
Where it doesn't
- Documented operating-system coverage ends with Windows 8
- No decryption support
- Focused on TCP/IP capture rather than broad protocol analysis

Our verdict on SmartSniff

SmartSniff is a portable freeware utility from NirSoft for capturing TCP/IP packets from a selected network adapter and presenting them as client-server conversations. It suits Windows users who need a focused way to inspect traffic, review live conversations, apply filters, and save captured data without installing a larger analysis suite. Views include ASCII, hexadecimal, automatic, and URL-list formats, giving basic traffic inspection different ways to present the same capture.

The tool’s ecosystem is centered on Windows capture components and related NirSoft utilities. It can capture through raw sockets, WinPcap/Npcap, or the Microsoft Network Monitor Driver. IPNetInfo and the GeoLite City database are also listed integrations. For operational workflows, SmartSniff supports capture and display filters, packet-summary and TCP/IP-stream exports, several capture-file formats, and command-line capture options. It can also retrieve process information for captured TCP packets and extract HTTP files from selected streams. Its Freeware plan includes TCP/IP packet capture, conversation viewing, filters, and export or save functions.

SmartSniff is a practical choice for basic TCP conversation capture on the Windows versions it documents, including Windows 98/ME, NT, 2000, XP, 2003, 2008, Vista, 7, and 8. Its scope is narrower than a full protocol-analysis platform: decryption is not supported, and the feature set is focused on TCP/IP packets, conversations, streams, and HTTP extraction. Choose it when free, portable capture with filtering and command-line options matches the task. Choose an alternative when current Windows coverage, encrypted-traffic analysis, or broader protocol inspection is required.

Your product? Our editors can test SmartSniff in depth and publish a review, labelled as paid · from $149/mo →

SmartSniff pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on nirsoft.net

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SmartSniff fact sheet

Free plan	Yes
Paid from	Free
Live capture	Yes
Command-line tool	Yes
Traffic decryption	No
Operating systems	Windows 98/ME/NT/2000/XP/2003/2008/Vista/7/8
Capture file formats	.ssp, tcpdump/libpcap, Microsoft Network Monitor .cap
Protocol dissectors	Not verified
Deployment	Desktop
Platforms	Windows
Support	Email, Docs
Built for	Solo, Small business (editorial estimate)
Integrations	4 integrations: WinPcap/Npcap, Microsoft Network Monitor Driver, IPNetInfo, GeoLite City database
Pricing	Free plan (source)
Website	nirsoft.net
Facts checked	21 Sep 2026

SmartSniff integrations

SmartSniff lists 4 integrations on its own site.

WinPcap/Npcap
Microsoft Network Monitor Driver
IPNetInfo
GeoLite City database

Alternatives to SmartSniff

See all SmartSniff alternatives →

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Featured on iTechGuides

SmartSniff is listed in our Network Packet Analyzer Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update