Voice to Text
Dictate anything — AI converts speech into a professional, formatted PDF.
Voice to PDF
Speak or type, AI formats it into a polished document
Record or upload audio
Record directly from your microphone or upload an existing audio file (MP3, WAV, M4A).
AI transcribes your audio
Our speech recognition AI processes the audio and generates an accurate text transcript in seconds.
Download as PDF or text
Save the transcript as a formatted PDF or plain text file — ready to share, edit, or archive.
Why SynthPDF?
Record in browser or upload
Start recording with one click using your microphone, or upload an existing audio file up to 150 MB.
AI-powered transcription
Whisper-based speech recognition handles accents, technical terminology, and natural speech patterns with high accuracy.
50+ languages
Transcribe audio in over 50 languages — with automatic language detection so you don't need to specify.
Export as PDF or text
Download the transcript as a cleanly formatted PDF or plain text file for easy editing and sharing.
Secure processing
Audio is processed over HTTPS and deleted from our servers within 30 minutes. We never retain recordings or transcripts.
Record on any device
Works on mobile, tablet, and desktop — record a voice memo on your iPhone and get the transcript as a PDF instantly.
When Voice-to-Text Saves Hours
- Meeting notes — record the meeting and get a full transcript rather than typing notes in real time
- Interviews — transcribe recorded interviews for journalism, research, or HR purposes
- Dictation — draft documents by speaking rather than typing — often 3x faster for long-form content
- Lecture notes — record a lecture and get a searchable transcript to study from
- Accessibility — convert audio content to text for deaf or hard-of-hearing audiences
How AI Speech Recognition Works
Our transcription engine uses a transformer-based speech recognition model that processes audio as a sequence of mel-spectrogram frames, learning to map acoustic patterns to text tokens. Unlike older rule-based systems, modern AI transcription handles:
- Natural speech with filler words, hesitations, and restarts
- Multiple speakers in the same recording
- Technical vocabulary, proper nouns, and domain-specific terms
- Accented speech and regional dialects
Tips for the Best Transcription Accuracy
- Record in a quiet environment — background noise is the biggest source of errors
- Speak clearly at a moderate pace — rushing reduces accuracy
- Use a quality microphone — even a $20 USB microphone dramatically improves results over laptop built-ins
- Review the transcript — proper nouns and technical terms may need manual correction
Voice to Text vs. Manual Transcription
Professional manual transcription costs $1–3 per minute of audio. A 60-minute meeting would cost $60–180 and take several hours to deliver. AI transcription delivers a 95%+ accurate transcript in under 2 minutes — free for recordings up to 10 minutes, and a fraction of the manual cost for longer recordings on Pro plans.
Frequently Asked Questions
MP3, WAV, M4A, OGG, FLAC, and WebM. You can also record directly in the browser using your microphone.
The transcription engine supports over 50 languages including English, Spanish, French, German, Hindi, Chinese, Japanese, Arabic, and Portuguese.
For clear speech in a quiet environment, accuracy is typically 95%+ for English. Accuracy varies with background noise, accents, and audio quality.
Free users can transcribe audio up to 10 minutes. Pro plan supports up to 60 minutes per file, Max and UltraMax support unlimited length.
Yes — upload the meeting recording (MP3 or M4A) and receive a full transcript. Speaker identification is available on Pro and above.