f4x 2023 Engine

f4x Automatic
Speech Recognition

„…best detection performance in the test …“
c´t 17/21

Register now and try 30 minutes of speech recognition for free

For interviews – test it free of charge!

For interviews, podcasts, zoom recordings… etc. f4x runs directly in the browser. Your uploaded data is secure and GDPR compliant. Every new registered account gets 30 minutes of speech recognition for free.

  • GDPR compliant infrastructure
  • Server in Germany
  • without training and learning effort
  • especially for interviews

You need more
time quota?

That can f4xAll features of automatic speech recognition

  • Automatically generate a text from speech in an audio or video file
  • 1 hour interview is completed after about 1 hour of processing time.
  • GDPR-compliant implementation on servers in Germany and encrypted upload and download
  • Automatic speaker discrimination and separation of speakers into their own paragraphs
  • Upload multiple files at once in popular audio and video formats (wav, mp3, aac, ogg, mpeg, m4a, mp4, flac)
  • Especially for natural speech e.g. in interviews, podcasts or even dictations
  • Cross-platform use via browser on all operating systems and mobile devices.
  • Billing by the minute according to the amount of material and no subscription
  • Download as Word file (DOCX), for f4transcript (RTF) and as subtitle (SRT)

For recording in 20 languages

  • English(UK&US)
  • Catalan
  • Danish
  • Dutch
  • Finnish
  • French
  • German
  • Greek
  • Hungarian
  • Italian
  • Japanese
  • Norwegian
  • Polish
  • Portuguese
  • Romanian
  • Russian
  • Spanish
  • Swedish
  • Turkish
  • Ukrainian

Without surcharge Functions for special applications

  • Sharing of a quota by many users on the basis of a company or domain account
    (if you are interested, please contact us by e-mail).
  • Automatic time stamps in the format #00:00:00-0#, optionally at the beginning or end of the paragraph
  • Pause detection by dot character (.) or exact second indication
  • Specification of own word lists for better recognition of technical terms within the recording

f4x 2023 EngineBest recognition performance

c’t already certified 2021 “best detection performance in the test”.
(c´t 17/21). In October 2022, we completely renewed f4x and improved the recognition by about 50%. Good transcripts are now generated even from challenging shooting situations. This significantly reduces correction times.

Test f4x now with your data.
We give you 30 minutes contingent for new registration.

We maintain high safety standards GDPR compliant

We pay attention to high security standards and transparent infrastructure so that your data is processed by us in compliance with GDPR.

Your data will be used exclusively for speech recognition and not for other purposes or even passed on. The transmission of your data is already encrypted during the upload.

Read our f4x procedure concept (submitted to the Hessian Data Protection Commissioner) here.

Speech recognition runs exclusively on ISO-27001 certified servers in Germany.

Immediately after the conversion, the recordings are deleted. The text file is stored in encrypted form until collection. After that, the data is deleted from our servers. The finished transcripts are then only available locally to you as a text file.

By the way, our servers not only run securely, but 100% with climate-neutral energy from hydropower.


No subscriptions,
No time limit,
Billing by the minute according to material length,
contingent can be used in any time.

from 5,56 Euro / h = 9,27ct / Min.

Arrow Down Top

100 hours
  3 hours 5 hours 10 hours 15 hours 1.000 hours
studying / doctorate 33 €
11 €/h
44 €
8,80 €/h
77 €
7,70 €/h
99 €
6,60 €/h
all others 55 €
18,33 €/h
66 €
13,20 €/h
111 €
11,00 €/h
144 €
9,60 €/h
777 €
7,77 €/h
5555 €
5,56 €/h

Prices incl. VAT

Billing by the minute

Voice recognition requires a quota, which you can buy in hourly packages and redeem in your account.

Billing is per minute per uploaded material,

the quota can be used flexibly and does not expire.

No subscriptions or similar standing payments.

You need
time quota?

Flexible optionsFor projects and companies

If you purchase 100 hours or more, you can receive them on request as any combination of individual contingent codes. Flexible and can be used independently of time. You can use these codes in your project or pass them on to external employees or students.

We are also happy to set up domain accounts for institutions. All users with a common e-mail domain, e.g. …@stud.uni-example.com can use a common quota. Uncomplicated to set up, no further administration necessary.

Please contact us by email before purchase.

f4transkriptCorrection software (optional)

  • Correct listening to transcripts at variable speed.
  • Easily adjust timestamps and speaker names.
  • Text modules for inserting transcription characters.
  • USB foot switch support
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