FFT Converter

Extract text from FFT files


Drop or upload your .FFT file
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How to extract text from your FFT file

  1. Click the "Select File" button above, and choose your FFT file.
  2. You’ll see a preview, if available.
  3. Click the "Convert file to..." button to extract text information.

Convert FFT to another file type

To convert your FFT file to another format, you need LTspice or other Data software.

  • FFT to PSD
  • FFT to DB
  • FFT to DBM
  • FFT to POWER
  • FFT to DLL
  • FFT to SO
  • FFT to DYLIB
  • FFT to BUNDLE
  • FFT to PLUGIN
  • FFT to XPI
  • FFT to CRX
  • FFT to SAFARIEXTZ

Convert a file to FFT

To convert other file formats to the "Simulation Data Log" file type, you need software like LTspice or a similar tool.

  • LV2 to FFT
  • DYLIB to FFT
  • VST to FFT
  • AAX to FFT
  • DRV to FFT
  • TDE to FFT
  • LADSPA to FFT
  • BUNDLE to FFT
  • AU to FFT
  • DLL to FFT
  • RTAS to FFT
  • SO to FFT

About FFT files

The .fft extension is a classic example of a filename indicating a mathematical method - Fast Fourier Transform - rather than a single standardized file format. In the engineering world, specifically within LTspice by Analog Devices, an .fft file contains the raw frequency domain data exported from a circuit simulation. While essential for analyzing frequency response within the simulator, these files are notoriously inconvenient for external reporting. They are often proprietary binary or specific text formats that cannot be opened by standard graphing tools, and they lock your data into the simulation environment.

Another significant use case is within Adobe Audition, where the file functions as a "Noise Print." This is a spectral fingerprint of background noise (like air conditioning hum) captured to filter audio. These are highly specific data blobs that cannot be played like MP3s or edited in other DAWs. Less commonly, you may encounter legacy IBM Final Form Text documents.

For engineers and analysts, the primary goal is data extraction. Converting LTspice .fft files to CSV (Comma Separated Values) or TXT is the standard workflow to enable plotting in Microsoft Excel, MATLAB, or Python. For documentation purposes, converting the visual representation to PDF or PNG ensures the simulation results are accessible without requiring the original CAD software.

Convert.Guru analyzes your FFT file, detects the exact format, and lets you read the text inside.

Users also converted PPTX, JFIF, TTF, PDF, JPEG, CIR, ASY, H3D, PSD, DB, DBM and POWER files.



The FFT Converter Story

The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our FFT converter.