Transcribe MP3 to Text — Free + Accurate
Drop an MP3, get back searchable text in about 5 minutes. 99.5% accuracy on sermons, lectures, podcasts, and interviews. Your first 10 minutes are free; everything after is $0.006/min on Standard.
Processing
5 min / 45-min MP3
Accuracy
99.0–99.5%
Privacy
Audio deleted after 30d
What is an MP3 file?
MP3 (MPEG-1 Audio Layer III) is the most common audio format for sermon recordings, podcasts, and lectures. It uses lossy compression, which trades a small amount of audio fidelity for an enormous drop in file size. At 96–128 kbps mono, a 45-minute sermon comes out to about 20–30MB — small enough to email, fast enough to stream.
For transcription, MP3 is ideal. The compression artifacts that matter to audiophiles are invisible to speech-to-text models. A 64 kbps MP3 transcribes as accurately as the same audio at 320 kbps — and it's five times smaller. If you're recording sermons specifically for transcription, MP3 mono at 64 kbps is the sweet spot.
Step-by-step: MP3 to text in 5 minutes
- 1
Open the transcription tool
Click /transcribe in the top nav, or hit the orange Start Free Transcription button above. No signup needed for your first 10 minutes.
- 2
Drop your .mp3 file into the upload zone
Drag and drop straight from Finder or Explorer. Files up to 25MB are accepted on the free tier. The upload bar shows percentage complete; a 30MB MP3 typically uploads in 10–20 seconds on home broadband.
- 3
Pick your tier
Standard ($0.006/min, OpenAI Whisper) is best for single-speaker recordings and is what most users pick. Premium ($0.02/min, ElevenLabs) adds speaker diarization — use it if you have a panel discussion, sermon Q&A, or multi-voice interview.
- 4
Wait roughly one-tenth of the audio length
A 10-minute MP3 transcribes in about 1 minute. A 45-minute sermon takes about 5 minutes. You can leave the tab open or check back later — the result is saved to your dashboard.
- 5
Review and download
Scrub the transcript inline against the audio waveform; click any line to jump to that moment. Download as .txt, .srt (video captions), .vtt (web captions), or .docx (formatted with timestamps every 30 seconds).
- 6
Publish or repurpose
Drop the .txt into your blog CMS for a full sermon post. Use the .srt with your YouTube/Vimeo upload for auto-synced captions. Pull the most quotable lines for social cards or a midweek email.
File format & size compatibility
| Format | Free tier max | Pro max | Recommended bitrate |
|---|---|---|---|
| MP3 | 25 MB | 500 MB | 64–128 kbps mono |
| WAV / AIFF | 25 MB | 500 MB | 16-bit 16 kHz mono |
| M4A / AAC | 25 MB | 500 MB | Native iPhone Voice Memo |
| FLAC / OGG | 25 MB | 500 MB | Native lossless OK |
| MP4 / MOV (video) | 25 MB | 500 MB | Audio track extracted |
| WEBM | 25 MB | 500 MB | Audio track extracted |
MP3-specific tips
- File over 25MB? Re-export at 64 kbps mono in Audacity (File → Export → Export as MP3 → Quality: 64 kbps, Channel Mode: Mono). A 60-minute sermon will land around 28MB. Or in ffmpeg:
ffmpeg -i input.mp3 -ac 1 -b:a 64k output.mp3 - Recording fresh? Record directly to MP3 mono at 64 kbps. Most sermon-recording apps (RodeCaster, Zoom H1, Voice Memos exported) can do this natively. Stereo is wasted bandwidth for a single voice.
- Variable bitrate (VBR) MP3s work fine — our encoder normalizes them before transcription. No need to re-encode constant bitrate.
- Multiple speakers? Switch to Premium ($0.02/min) for diarization. Standard tier transcribes everything but doesn't label who said what.
- Background music or worship? Trim the worship set out before uploading (Audacity, Reaper, any DAW) — speech-to-text struggles with sustained singing. Send only the spoken portion.
The MP3 transcription workflow
MP3 transcription pricing vs alternatives
| Service | Cost / 45-min MP3 | Accuracy | Output formats | Free tier |
|---|---|---|---|---|
| Sermon Transcription (Std) | $0.27 | 99.0–99.5% | .txt .srt .vtt .docx | 10 min free |
| Sermon Transcription (Premium) | $0.90 | 99.5%+ with diarization | .txt .srt .vtt .docx + JSON | 10 min free |
| Rev AI | $11.25 | 90–95% | .txt .srt .vtt + JSON | 5 hours free |
| Rev human | $67.50 | 99%+ | .txt .docx + timestamps | None |
| Otter Pro | ~$0.64 effective | 90–95% | .txt .docx .srt | 300 min / mo |
| HappyScribe AI | ~$9.00 | 85–92% | .txt .srt .vtt | None |
Otter Pro effective rate computed as $16.99/mo ÷ 1,200 included minutes × 45 minutes. Rev AI per-minute rate $0.25/min; Rev human $1.50/min. HappyScribe AI list price ~$0.20/min as of early 2026. Numbers do not include free-tier discounts.
MP3 transcription FAQ
Is it really free to transcribe MP3 to text?+
Yes. The first 10 minutes of audio are free for every account, no credit card required. After that, MP3 transcription is $0.006/minute on Standard (Whisper) — roughly $0.27 for a 45-minute sermon. Premium tier with speaker diarization is $0.02/minute.
What is the maximum MP3 file size I can upload?+
25MB on the free tier — that fits a 45-minute sermon at 64 kbps mono. Files larger than 25MB are supported on Pro accounts (up to 500MB per file). If your MP3 is over 25MB, re-export at 64 kbps mono in Audacity or ffmpeg — voice quality stays excellent.
How accurate is MP3 transcription?+
On clear voice MP3s at 64 kbps or higher we measure 99.0–99.5% accuracy. Bible verses, theological terms, and proper nouns are handled correctly because the Whisper model is biased toward religious and technical English. Errors typically cluster around heavily accented speech and unusual proper nouns.
What bit rate should my MP3 be?+
For voice-only content (sermons, interviews, lectures), 64 kbps mono is sufficient and keeps file size small. 128 kbps is the safe default. Above 192 kbps is wasted on transcription — the model can't extract more text from higher bitrates.
Can I batch-transcribe multiple MP3 files at once?+
Yes. Pro accounts support folder upload — drop in a folder of MP3s and each file is transcribed in parallel. Results are emailed and saved to your dashboard, downloadable as TXT, SRT, VTT, or DOCX.
What output formats can I download?+
Every transcription produces four files: plain text (.txt), captions (.srt for video editors, .vtt for the web), and a formatted Word document (.docx) with timestamps every 30 seconds. The JSON export with word-level timestamps is also available on Pro.
Try it on your next MP3
The first 10 minutes are free. No credit card, no signup wall. If the result is good, you keep it; if it isn't, walk away with no cost.
Upload your MP3Related
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