Sample MP3 Files — Download Test Audio (64 to 320 kbps, 15 s to 5 min)
MPEG-1 Audio Layer III · .mp3 · MIME type audio/mpeg
Download a sample MP3 file in the bitrate and length you need — from a 15-second 64 kbps mono clip of about 120 KB to a five-minute 128 kbps file of roughly 4.8 MB — plus a VBR V2 encode to test players and tag readers that mis-report VBR durations. All clips are the same synthesized instrumental, so bitrate comparisons are apples to apples.
MP3 is the most universally playable audio format ever made. Its patents expired in 2017, every device decodes it, and it remains the default for podcasts, voice notes and audio previews. Newer codecs (AAC, Opus) are more efficient, but nothing is more compatible.
Download sample MP3 files
| File | Details | Size | Download |
|---|---|---|---|
sample-audio-15s-mono-64kbps.mp3 | 15 s · MP3 · 64 kbps · 44.1 kHz · mono | 121 KB | |
sample-audio-15s-128kbps.mp3 | 15 s · MP3 · 128 kbps · 44.1 kHz · stereo | 241 KB | |
sample-audio-30s-vbr-v2.mp3 | 30 s · MP3 · 107 kbps · 44.1 kHz · stereo | 402 KB | |
sample-audio-30s-192kbps.mp3 | 30 s · MP3 · 192 kbps · 44.1 kHz · stereo | 722 KB | |
sample-audio-60s-320kbps.mp3 | 1 min · MP3 · 320 kbps · 44.1 kHz · stereo | 2.4 MB | |
sample-audio-5min-128kbps.mp3 | 5 min · MP3 · 128 kbps · 44.1 kHz · stereo | 4.8 MB |
Need one of every audio format? Download the audio sample pack (1.7 MB, one small file of every audio format (9 files)).
Use these files from the command line or CI
Every URL is stable and CORS-open. Pin the SHA-256 in your test and you will know the moment a fixture changes.
# Download one file curl -O https://pnb-website-bucket.s3.us-east-2.amazonaws.com/samples/audio/mp3/sample-audio-15s-mono-64kbps.mp3 # Verify it (SHA-256 is listed for every file above) shasum -a 256 sample-audio-15s-mono-64kbps.mp3 # Machine-readable index of every sample file curl https://pnb-website-bucket.s3.us-east-2.amazonaws.com/samples/index.json | jq '.files[] | select(.format=="mp3")'
MP3 format at a glance
| Full name | MPEG-1 Audio Layer III |
|---|---|
| Extensions | .mp3 |
| MIME type | audio/mpeg |
| Standard | ISO/IEC 11172-3 (1993); patents expired 2017 |
| Compression | Lossy, 8–320 kbps CBR or VBR |
| Sample rate | 44.1 kHz (samples); up to 48 kHz |
| Channels | Stereo and mono samples |
| Tags | ID3v2 (title, artist, comment) |
| Magic bytes | 49 44 33 ("ID3") or FF FB |
What people test with sample MP3 files
- HTML5 <audio> playback and scrubbing
- Podcast and voice-note upload flows
- Duration detection with VBR files (a classic bug)
- Bitrate/quality listening comparisons
- Upload limits — the 5-minute file is just under 5 MB
Frequently asked questions
What bitrate should an MP3 be?
128 kbps is the long-standing 'good enough' for speech and casual listening, 192 kbps is transparent for most music on most equipment, and 320 kbps is the maximum. For speech-only content 64 kbps mono is fine and a quarter of the size.
Why does my player show the wrong length for the VBR file?
Variable-bitrate MP3s need a Xing/Info header to report duration; players that estimate length from file size and the first frame's bitrate get it wrong. Our VBR sample includes the header, so a correct decoder reports 30 s exactly.
Are these MP3 files safe to download?
Yes. Every file is generated by our own open script from scratch — nothing is scraped or user-uploaded — and contains no scripts, macros or executables. The SHA-256 of each file is published on this page so you can verify what you received.
Can I use the sample MP3 files commercially?
Yes. They are free for any purpose, including commercial products, test suites, demos and redistribution, with no attribution required. There is nothing to license and no one to ask.
Can I hotlink these files or use them in CI?
Yes. Every link is a stable direct URL over HTTPS with Access-Control-Allow-Origin: * and long cache headers, so curl, wget, fetch() and test runners can pull them directly. A JSON index of every file is linked from each page (see the command-line section).
Related sample files
Testing a file pipeline? We build them.
Uploads, conversions, previews, document processing and media workflows are the kind of production systems Pine & Birch designs and runs for clients — which is why we needed these files in the first place.
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