All about S2P Files

The S2P file type is primarily associated with Keysight ADS.

S2P	File extension: S2P
	File type:	Touchstone-format data file

What is an S2P file?

S2P files mostly belong to Keysight ADS. S2P files are specialized Touchstone data files that record scattering parameters for two-port networks.
They usually include frequency values along with complex S-parameter data (such as S11, S21, S12, and S22), which help analyze how RF signals are reflected and transmitted through a device.
Key Details as outlined by FilExt.com:

Designed for RF measurements in devices like filters, amplifiers, and antennas.

Uses a plain text format following the Touchstone standard.

Commonly generated by network analyzers and simulation tools from vendors like Agilent Technologies (Agilent), Keysight Technologies, and Rohde & Schwarz (Rohde & Schwarz).

Often labeled as Touchstone, 2-port, or S-parameter files.

FilExt.com note: These files are viewable in any text editor and are typically imported into RF simulation software for plotting and further analysis.

How to open an S2P file

You need a suitable software like Keysight ADS to open an S2P file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your S2P file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a S2P file directly in the browser:. Just drag the file onto this browser window and drop it.

Online S2P Text Viewer

Choose your .s2p file to view

or drag and drop it here

Online File Viewer

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How to extract texts from S2P files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

You can extract texts from S2P file or capture a preview screenshot using our online S2P file viewer:

To do so, click the "Choose your .s2p file to view" button above.
After your file is opened in browser,
click "Save as..." in the menu.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Download the converted file.

Programs that open and convert S2P files:

Keysight ADS
See the previous paragraphs to learn more about the main application. S2P files are often referred to as Keysight ADS data files because this type of file is primarily created or used by this software.
Sonnet File

S2P format details:

To view or edit S2P files you need to know the file format, because it determines how the data in this file is stored. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Exact knowledge of the format is therefore important in order to solve problems occurring in files. In the following you will find our evaluation of the S2P files:

The S2P file type is a very commonly used file extension and is used by a few programs, each with its own file format. The two most popular formats are as follows:

20% of all S2P files use the same file format, which can be identified by the letters "!Agilent " at the beginning. The content consists of readable text data, which can be read using a text editor. S2P files can be up to 1 MB in size, but are often around 21 KB - 210 KB. The file type was created 10 years ago, but is still used today. The files contain the following words: Date, Agilent Technologies, !Data & Calibration Information, !Freq, !Correction: S11(Full 2 Port(1,2)), !S21(Full 2 Port(1,2)) and SOLT. These files can be linked to touchstone, auto and save.
10% of all S2P files start with the bytes !Keysight Technologies crucial for this file format. If you open these files in a text editor, you can view and read the content yourself. S2P files are between 19 KB and 170 KB in size. The files contain the following words: Date, Keysight Technologies, !Correction: S11(Full 2 Port(1,2)), !S12(Full 2 Port(1,2)) and !S21(Full 2 Port(1,2)). Files like these are sometimes connected to jaguar, asmk and cable.

All the rest of the S2P files (70%) have different formats. These files are often connected to spar, degc, port, commonemitter, parameters or filter. If you want to find out what your S2P file contains, drag and drop it onto this page.

Technical Data for S2P File Extension

File classification:

Data

Related files:

s1p, s3p, s4p, snp, y2p, z2p, sp2, zip, s4p, snp, txt, png, xlf, xlsx, prn, ris

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: Direct WAV MP3 Splitter
EXEFile: %ProgramFiles%\Direct MP3 Splitter Joiner\Splitter.exe

an s2p Touchstone-format data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with S2P files

Associate the S2P file extension with the correct application.
Update your software that should actually open touchstone-format data files. Because only the current version supports the latest S2P file format. Search, therefore, e.g. on the manufacturer website after an available Keysight ADS update.
To make sure that your S2P file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .S2P file online - secure, fast, and no downloads needed.