1 MB MP3 sample file
An MP3 file of exactly 1,048,576 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-mp3-1mb.mp3
1 MB1,048,576 bytes
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- Type
- audio/mpeg
- SHA-256
6330df92ea19c25a1e1f24c48bee7a0553d55eefe37fff3735e25dd4ba8fca0c- Direct URL
https://sampletestfiles.com/downloads/mp3/sample-mp3-1mb.mp3
What is in this file
2,508 MPEG audio frames (1 min 6 s) of a synthesised musical phrase that repeats every eight seconds, after an ID3v2.3 tag. 224 bytes of zero bytes in the tag's standard padding area bring the file to the exact size.
| Duration | 1 min 6 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-mp3-1mb.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 02 48 54 49 54 32 00 00 |ID3......HTIT2..|
00000010 00 12 00 00 00 53 61 6d 70 6c 65 20 4d 50 33 20 |.....Sample MP3 |
00000020 28 31 20 4d 42 29 54 50 45 31 00 00 00 10 00 00 |(1 MB)TPE1......|
00000030 00 53 61 6d 70 6c 65 54 65 73 74 46 69 6c 65 73 |.SampleTestFiles|Preview
Displays the file in your browser.
Where 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Download tests on mobile connections
- Checking duration detection and waveform rendering
- Testing transcoding and podcast pipelines
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-mp3-1mb.mp3 |
|---|---|
| Format | MP3 (MPEG-1 Audio Layer III) |
| Extension | .mp3 |
| MIME type | audio/mpeg |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Binary |
| Signature | 49 44 33 |
| SHA-256 | 6330df92ea19c25a1e1f24c48bee7a0553d55eefe37fff3735e25dd4ba8fca0c |
| 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-mp3-1mb.mp3 'https://sampletestfiles.com/downloads/mp3/sample-mp3-1mb.mp3'
sha256sum sample-mp3-1mb.mp3 # Linux
shasum -a 256 sample-mp3-1mb.mp3 # macOSOn Windows, run Get-FileHash sample-mp3-1mb.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 1 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB MP3 file?
- 2,508 MPEG audio frames (1 min 6 s) of a synthesised musical phrase that repeats every eight seconds, after an ID3v2.3 tag. 224 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.