> ## Documentation Index > Fetch the complete documentation index at: https://docs.gladia.io/llms.txt > Use this file to discover all available pages before exploring further. # Pre-recorded Features > Core features of the Gladia Pre-recorded STT API The core functionality of the Gladia API is its Speech Recognition model, designed to convert spoken language into written text. Additional capabilities like diarization, summarization, translation, custom prompts and more can be enabled by adding parameters to your request. Detect speakers and understand who said what, and when. Automatically redact names, emails, vehicle IDs, and other PII in pre-recorded transcripts. Generate ready-to-use subtitle files in SRT or VTT formats. Boost recognition accuracy for brand, product, and domain terms by matching how they sound (phoneme-based). Replace specific text variants with your preferred spelling. Improved punctuation and casing for cleaner, easier-to-read transcripts. Group words into sentences with timing for better readability and parsing. Enforce consistent rendering of speaker and entity names. Transcribe stereo or multi-channel audio with channel-aware processing. Detect speakers and understand who said what, and when. Generate ready-to-use subtitle files in SRT or VTT formats. Fix mis-transcribed words by matching how they sound (phoneme-based). Replace specific text variants with your preferred spelling. Attach and propagate metadata to organize and trace your jobs. Want to know more about the audio intelligence features? Check out our [Audio Intelligence](/chapters/audio-intelligence) chapter.