Transcribe MP3 to Text with AI
Upload an MP3 file, get accurate text in minutes. Automatic speaker identification, four output formats (TXT, SRT, VTT, JSON), and flat-rate pricing — no subscription, no monthly minimum.
How to Transcribe an MP3 File
BrassTranscripts converts MP3 audio to text in three steps. No software install, no format conversion, no account commitment beyond the file you upload.
Upload Your MP3
Drag and drop your MP3 file onto the upload box, or click to select. Files up to 250 MB are accepted with no format conversion required — MP3 is processed natively.
AI Transcribes the Audio
The AI transcription engine processes your MP3 in 1-3 minutes per hour of audio. Speakers are identified automatically — Speaker A, Speaker B, and so on — with no extra setup. You can preview the first 30 words to verify accuracy before paying.
Download in TXT, SRT, VTT, and JSON
All four output formats are included with every transcript. TXT for documents and notes, SRT for video editors and YouTube captions, VTT for web video players, and JSON with timestamps and speaker data for developer workflows.
Why MP3 Works Perfectly for Transcription
MP3 is the most common audio format in use — voice memos, podcast downloads, dictation apps, recorded interviews, and conference call exports all default to MP3. BrassTranscripts processes MP3 natively at any standard bitrate (64 kbps and up), so there's no quality loss or pre-processing step between you and a finished transcript.
Compressed audio formats like MP3 work as well as uncompressed WAV for transcription accuracy when the source recording is clear. The AI model is trained on a wide variety of audio quality levels, so a typical 128 kbps MP3 voice recording produces the same transcript quality as a much larger WAV of the same content.
MP3 Transcription Pricing
Flat-rate pricing based on audio duration. Pay only for what you transcribe — no subscription, no per-minute meter, no surprise charges.
| MP3 Duration | Price | Effective Per-Minute |
|---|---|---|
| 1-15 minutes | $2.50 flat | $0.17-0.25/min |
| 16-120 minutes | $6.00 flat | $0.05-0.38/min |
Need bulk pricing for many MP3 files at once? Check the bulk transcription guide for tiered pricing on 20+ files.
Other Audio Formats Supported
MP3 is the most common, but BrassTranscripts accepts 11 audio and video formats — no conversion required for any of them:
For a deep dive on differences between formats and which to use when, see the file formats comparison guide.
MP3 Transcription FAQ
What's the maximum MP3 file size BrassTranscripts accepts?
BrassTranscripts accepts MP3 files up to 250 MB. For typical spoken-word recordings encoded at 128 kbps, that covers roughly 4 hours of audio; at 320 kbps it covers about 1.7 hours. If your MP3 exceeds 250 MB, split the file into segments before uploading or re-encode at a lower bitrate (96-128 kbps is plenty for transcription accuracy).
Do I need to convert MP3 to WAV or any other format first?
No. BrassTranscripts processes MP3 files natively — no conversion required. The AI transcription engine handles MP3, M4A, WAV, AAC, FLAC, OGG, Opus, WebM, MPGA, MP4, and MPEG inputs directly. Upload the MP3 as-is and download the finished transcript in TXT, SRT, VTT, and JSON formats.
Will speakers be identified automatically in MP3 transcripts?
Yes. Every MP3 transcript includes automatic speaker identification at no extra charge. The system labels distinct voices as Speaker A, Speaker B, and so on, with consistent labels throughout the file. Speaker identification works best with 2-6 speakers who have distinct voices and minimal overlapping speech — typical for interviews, meetings, and podcasts.
What format do I get back after transcribing an MP3?
BrassTranscripts delivers four output formats with every MP3 transcription: TXT (plain text for documents and notes), SRT (subtitles for video editors and YouTube), VTT (web video player captions), and JSON (timestamps and speaker data for developer workflows). All four are included in the flat-rate price and downloadable from the same job page.
More questions? Visit our complete FAQ page or contact .
Ready to Transcribe Your MP3?
Upload now • Preview before paying • Download TXT, SRT, VTT, and JSON in minutes
Upload MP3 Now →$2.50-$6 flat rate • No subscription • Automatic speaker identification • 100% satisfaction guarantee