SAZ File

What are SAZ files and how to open them

Are you having problems opening a SAZ file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your SAZ files.

What is a SAZ file?

A .SAZ file is a Fiddler Session Archive Zip file.

Fiddler Session Archive ZIP (SAZ) is a file format used to collect and save web traffic (HTTP, HTTPS, WebSocket, and gRPC) captured by the Fiddler suite of tools for later analysis. Files of this type are generated when you invoke the "Save All Sessions" or export functionality within Fiddler, Fiddler Everywhere, Fiddler Classic, or FiddlerCore. Their main purpose is to record the complete sequence of network requests and responses made during a browsing or application session, together with metadata about those exchanges so that developers or analysts can inspect, debug, or troubleshoot issues at a later time.

When a SAZ file is created, Fiddler compresses the session archive into a ZIP‐formatted file that can optionally be encrypted or password‐protected. Inside there is a "Raw" folder containing one or more files per captured session - typically a file with the raw client request (sessid#_c.txt), the raw server response (sessid#_s.txt), metadata in XML (sessid#_m.xml), and, in newer versions, optional files for WebSocket (sessid#_w.txt) and gRPC messages (sessid#_g.txt). The archive also contains an index or summary in HTML, often _index.htm, plus other packaging metadata (for example [Content_Types].xml) for compatibility. When you open Fiddler later and import the SAZ file, it rebuilds the sessions within its interface so you can browse headers, responses, timings, etc.

Technically, a SAZ file is a regular ZIP archive that starts with the standard ZIP file signature (bytes 0x50 0x4B 0x03 0x04) and includes identifiable names inside such as "_index.htm", "_c.txt", "_s.txt", "_m.xml", and in newer ones "_g.txt" etc., as well as strings like "SESSION ARCHIVE. SEE HTTP" and "WWW.FIDDLER."

How to open SAZ files

We have identified one SAZ opener that is compatible with this specific type of SAZ file.

Programs that open Fiddler Session Archive Zip files

Last updated: August 13, 2026

Various apps that use files with this extension

These apps are known to open certain types of SAZ files. Remember, different programs may use SAZ files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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