MP3 · WAV · OPUS · M4A · MP4 · up to 5 GB
AI Audio Transcription — Fast, Accurate, and Free to Start
Convert any audio to text in minutes. AssemblyAI engine with 99% accuracy, speaker identification, and export in 6 formats. Free up to 30 min/month.
🎙️ Transcribe for free
Upload your audio or video and get the text in seconds.
30 minutes free per month. No credit card required.
Supported formats: MP3, WAV, OPUS, M4A, MP4, OGG, FLAC (up to 5 GB)
How it works
- 01
Upload your audio file
Drag and drop the file onto the upload area or click to browse. Accepted formats: MP3, WAV, OPUS, M4A, OGG, FLAC, MP4, MOV, AVI, MKV — up to 5 GB. No pre-conversion needed.
- 02
AI processes and transcribes
The AssemblyAI engine analyzes the audio in real time: separates speech from background noise, identifies speakers, applies automatic punctuation, and normalizes the text. A 1-hour file is ready in under 3 minutes.
- 03
Review, edit, and export
The transcript appears in an editor synced with the audio — click any segment to hear the original. Export in TXT, DOCX, SRT, VTT, PDF, or JSON. Files are stored in your dashboard indefinitely on paid plans.
Why use AI for audio transcription?
Manual transcription — a person listening and typing — takes an average of 4 hours to transcribe 1 hour of audio. With VoxScriber, the same file is ready in under 3 minutes. That's not just speed: it's the difference between a viable task and an impossible one for most people.
Professionals who transcribe regularly — journalists, lawyers, doctors, researchers, content creators — save between 10 and 40 hours per month by switching from manual to AI transcription. At $50/hour of work, that's $500–$2,000 per month in recovered productivity.
The current accuracy of top AI transcription engines (95–99% for good-quality audio) has made human review a quick post-processing step — no longer a full re-typing from scratch. Most VoxScriber users spend less than 5 minutes reviewing the transcript of a 1-hour meeting.
Which professionals use audio transcription the most?
Journalists and media professionals transcribe interviews and press conferences directly from recordings to text, accelerating article and report production.
Lawyers and law firms use it to transcribe hearings, depositions, dictated filings, and client meetings. It integrates with legal documentation workflows.
Doctors and healthcare professionals transcribe consultations (with patient consent), anamneses, and reports, reducing clinical documentation time.
Researchers and academics transcribe qualitative interviews, focus groups, and field research. Speaker identification simplifies multi-party conversation analysis.
Content creators and podcasters transcribe episodes to generate blog posts, captions, newsletters, and social media snippets from a single audio file.
Managers and corporate teams transcribe Zoom, Google Meet, and Microsoft Teams recordings to auto-generate meeting minutes, action items, and decision logs.
How to get the best transcription quality
The accuracy of automatic audio transcription depends heavily on the original file quality. A few practices that significantly improve results:
Recording: Use a dedicated microphone when possible. Lapel mics ($10–$30) dramatically improve quality over a laptop's built-in mic. For interviews, the Rode VideoMicro or DJI Mic are accessible references.
Environment: Reduce background noise. Close windows, turn off fans and air conditioning during recording. AI handles light noise well, but heavy noise reduces accuracy.
Diction: Speak at a moderate pace. Very fast speech increases error rates. Natural pauses between sentences help the AI correctly identify sentence boundaries.
File format: WAV (uncompressed) offers the highest quality, but MP3 at 128 kbps or higher is sufficient for accurate transcription. WhatsApp OPUS files work well despite high compression.
Frequently asked questions
What is automatic audio transcription?
Automatic audio transcription is the process of converting speech to text using artificial intelligence. Unlike human (manual) transcription, the AI analyzes the audio file and produces text in seconds — no human operator needed. VoxScriber uses the AssemblyAI engine, one of the most accurate available for English and Portuguese.
How accurate is audio transcription?
For audio with good recording quality (decent microphone, low noise), accuracy reaches 95–99%. For audio with heavy background noise or strong accents, accuracy is 85–95%. VoxScriber displays a confidence percentage for each paragraph of the transcript.
Which audio formats are supported for transcription?
VoxScriber accepts all common formats: MP3, WAV, OPUS (WhatsApp standard), M4A (iPhone standard), OGG, FLAC, AAC, MP4, MOV, AVI, MKV, WMV, and more. Files up to 5 GB. No conversion needed before uploading.
How long does it take to transcribe 1 hour of audio?
With the AssemblyAI engine, 1 hour of audio is transcribed in approximately 1 to 3 minutes, depending on server queue. For smaller files (up to 15 min), results typically arrive in under 60 seconds. Very large files (2h+) may take up to 8 minutes.
Can I transcribe audio with multiple speakers?
Yes. VoxScriber automatically identifies different speakers (speaker diarization). Each speaker receives a label ("Speaker 1", "Speaker 2", etc.) in the final text. This feature is available on all plans, including the free tier.
Does the transcription work for languages other than English?
Yes. VoxScriber supports 20+ languages including Portuguese, Spanish, French, German, Italian, Japanese, and more. The AssemblyAI engine is optimized for each language's phonetics and vocabulary.
How does the free transcription work?
The free plan includes 30 minutes of transcription per month, no credit card required. Each file is limited to 10 minutes. Results are exportable in TXT and PDF. For larger files or higher monthly volume, paid plans start at $9.90/month.
Are the uploaded audio files kept secure?
Yes. All files are transferred via HTTPS (encryption in transit) and stored with AES-256 encryption (at rest) on Cloudflare R2. Files from users without accounts are automatically deleted after transcription. Registered users can configure retention settings.
Can I transcribe video files too?
Yes. VoxScriber automatically extracts the audio track from video before transcribing. Supported formats: MP4, MOV, AVI, MKV, WMV, FLV. Ideal for transcribing classes, interviews, webinars, and recorded Zoom/Meet/Teams meetings.
How do I export transcription with timestamps?
Export in SRT or VTT format to get line-level timestamps. These formats are compatible with video editing software (Adobe Premiere, DaVinci Resolve, CapCut) and video platforms (YouTube, Vimeo). JSON format exports word-level timestamps individually.
What is the difference between transcription and captioning?
Transcription converts speech into continuous text with paragraphs and punctuation — ideal for minutes, reports, and documentation. Captioning is transcription with segment-level timestamps (SRT/VTT format), synced with the video for subtitle display. VoxScriber offers both: export DOCX/TXT for transcription or SRT/VTT for captions.
Does it work with Zoom, Google Meet, and Teams recordings?
Yes. Simply download the meeting recording (MP4 or M4A, depending on the platform) and upload to VoxScriber. Multi-speaker identification works very well with meeting recordings. For Zoom, local recordings are in Documents/Zoom. For Meet, check Google Drive.
Start free — 30 minutes of transcription, no credit card required
Try free — no credit card →30 minutes free per month. No credit card required.