100 KB MP3 sample file
An MP3 file of exactly 102,400 bytes. It is a valid MPEG-1 Audio Layer III file, generated for this site and checked with an independent parser.
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sample-mp3-100kb.mp3
100 KB102,400 bytes
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- Type
- audio/mpeg
- SHA-256
3100d333c7b0f85c57b91b9a9c184bc7acc5d6110f0c731e44edc1e7ba5fad9f- Direct URL
https://sampletestfiles.com/downloads/mp3/sample-mp3-100kb.mp3
What is in this file
244 MPEG audio frames (6.4 s) of a synthesised musical phrase that repeats every eight seconds, after an ID3v2.3 tag. 304 bytes of zero bytes in the tag's standard padding area bring the file to the exact size.
| Duration | 6.4 s |
|---|---|
| Bit rate | 128 kbit/s constant |
| Sample rate | 44,100 Hz |
| Channels | Stereo |
| Format | MPEG-1 Audio Layer III |
| Tags | ID3v2.3 (title, artist, album, genre) |
First bytes of the file
The first 64 bytes of sample-mp3-100kb.mp3 as a hex dump: offset, bytes, then the same bytes as text. The MP3 signature is 49 44 33.
00000000 49 44 33 03 00 00 00 00 03 18 54 49 54 32 00 00 |ID3.......TIT2..|
00000010 00 14 00 00 00 53 61 6d 70 6c 65 20 4d 50 33 20 |.....Sample MP3 |
00000020 28 31 30 30 20 4b 42 29 54 50 45 31 00 00 00 10 |(100 KB)TPE1....|
00000030 00 00 00 53 61 6d 70 6c 65 54 65 73 74 46 69 6c |...SampleTestFil|Preview
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Where 100 KB matters
A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Express body parsers | 100 KB (102,400 bytes) by default | A request body of exactly this size passes; anything larger returns 413 Payload Too Large. |
| Gmail message clipping | About 102 KB of HTML | Longer messages are truncated behind a "view entire message" link. |
| Amazon DynamoDB items | 400 KB per item | 100 KB fits; the 500 KB sample does not. |
Use this file for
- Checking email size handling
- Testing transcoding and podcast pipelines
- Testing audio upload and playback
Testing notes for MP3
- A large ID3 tag with artwork can push the first audio frame far into the file, confusing naive sniffers.
- Duration is not stored in a header. Players estimate it from bit rate and file size, which goes wrong for variable-bit-rate files that lack a Xing header.
Technical details
| File name | sample-mp3-100kb.mp3 |
|---|---|
| Format | MP3 (MPEG-1 Audio Layer III) |
| Extension | .mp3 |
| MIME type | audio/mpeg |
| Size | 102,400 bytes (100 KB) |
| Kind | Binary |
| Signature | 49 44 33 |
| SHA-256 | 3100d333c7b0f85c57b91b9a9c184bc7acc5d6110f0c731e44edc1e7ba5fad9f |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Available on this page |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Audio |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-mp3-100kb.mp3 'https://sampletestfiles.com/downloads/mp3/sample-mp3-100kb.mp3'
sha256sum sample-mp3-100kb.mp3 # Linux
shasum -a 256 sample-mp3-100kb.mp3 # macOSOn Windows, run Get-FileHash sample-mp3-100kb.mp3 -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 100 KB?
- Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 100 KB MP3 file?
- 244 MPEG audio frames (6.4 s) of a synthesised musical phrase that repeats every eight seconds, after an ID3v2.3 tag. 304 bytes of zero bytes in the tag's standard padding area bring the file to the exact size.
- What is on the MP3 samples?
- A short synthesised musical phrase that repeats. It was generated by code for this site, so it is free of any music copyright.