Transcribe MP3 to Text — Free + Accurate

Drop an MP3, get back searchable text in about 5 minutes. 99% accuracy on sermons, lectures, podcasts, and interviews. Your first full file is free; after that it's $19/month unlimited.

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. 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 full transcription.

2. 2

   Drop your .mp3 file into the upload zone

   Drag and drop straight from Finder or Explorer. Files up to 150MB are accepted — same limit for free and paid. The upload bar shows percentage complete; a 30MB MP3 typically uploads in 10–20 seconds on home broadband.

3. 3

   Enter your email

   One field, no password to create. Your transcript is delivered on the page and emailed to you so you have a copy. We only use it to send your transcript.

4. 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. 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. 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

MP3-specific tips

• File over 150MB? 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? Everything gets transcribed, but we don't label who said what — speaker diarization isn't offered today. For a single-preacher sermon that makes no practical difference.
• 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

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

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