01In plain English
Speech-to-text turns recorded or live speech into written words. You upload a meeting, interview or video, and the tool returns a transcript, often with speaker labels and timestamps. It is the same technology behind automatic captions and meeting notes.
02How it works
You upload a recording or connect a live meeting. The software first cleans the audio and slices it into tiny moments of sound. An AI model then matches the sound patterns to the words and language it has learned, using the surrounding words to choose between look-alikes such as their and there. A second step adds punctuation, splits the text into paragraphs and works out which voice is speaking, so the transcript reads like a script with speaker labels and timestamps. Many tools then summarize it or pull out action items. Accuracy depends on the audio: a clear microphone, little background noise and one person speaking at a time make a big difference. It is like a court reporter, but a program does the typing.
03Why it matters when you are choosing
A searchable transcript saves hours of typing up calls and interviews, and it feeds summaries, captions and subtitles. Accuracy drops with accents, background noise and technical vocabulary, so it varies by recording.
04What to check
Check accuracy on your own audio, which languages are covered, and whether it labels who is speaking. Ask how long audio files are kept and whether they are used to train the vendor's models.
05Where you will meet it
06Common questions
How accurate is speech-to-text?
On clear audio with one speaker, good tools are right most of the time. Accuracy drops with background noise, strong accents, crosstalk and specialist vocabulary. The only reliable test is to run a recording of your own through the tool and count the mistakes.
Can speech-to-text tell who is speaking?
Many tools can, a feature called speaker labeling or diarization. It works best when people speak one at a time on a clear recording, and it can mix people up on crowded calls. Some tools let you rename the speakers so the names stay in later transcripts.
Is it legal to record and transcribe a call?
Rules differ by place. Many regions require that everyone on a call knows it is being recorded, and some require explicit consent. Tell participants at the start, follow your company policy, and check the local law before recording calls with people in other regions.