1 MB FLAC sample file
A FLAC file of exactly 1,048,576 bytes. It is a valid Free Lossless Audio Codec file, generated for this site and checked with an independent parser. Use it wherever you need a 1 MB sample, test or dummy FLAC file.
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sample-flac-1mb.flac
1 MB1,048,576 bytes
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- Type
- audio/flac
- SHA-256
f6e01011aa95eb3def1b0cf53c8850f0f495d5fb513906a0ec3b425c4144b74b- Direct URL
https://www.sampletestfiles.com/downloads/flac/sample-flac-1mb.flac
What is in this file
64 FLAC frames (5.9 s) of a synthesised musical phrase that repeats every eight seconds. The samples are stored verbatim, so the audio decodes bit for bit to the matching WAV data. 3 bytes of a standard PADDING metadata block bring the file to the exact size.
| Duration | 5.9 s |
|---|---|
| Sample rate | 44,100 Hz |
| Channels | 2 (stereo) |
| Bit depth | 16-bit |
| Block size | 4,096 samples |
| Encoding | Verbatim subframes (lossless, not compressed) |
| Tags | Vorbis comment (title, artist, album) |
First bytes of the file
The first 64 bytes of sample-flac-1mb.flac as a hex dump: offset, bytes, then the same bytes as text. The FLAC signature is 66 4C 61 43.
00000000 66 4c 61 43 00 00 00 22 10 00 10 00 00 3c d0 00 |fLaC...".....<..|
00000010 40 0a 0a c4 42 f0 00 03 ff 31 b3 8c b2 21 7b 68 |@...B....1...!{h|
00000020 ff 37 47 00 60 a6 e8 47 f5 7b 04 00 00 85 25 00 |.7G.`..G.{....%.|
00000030 00 00 53 61 6d 70 6c 65 54 65 73 74 46 69 6c 65 |..SampleTestFile|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
- Finding the first upload limit in a new stack
- Testing audio upload where lossless input is accepted
- Checking transcoding to MP3, AAC or Opus
Testing notes for FLAC
- Cover art lives in the metadata, so a three-minute song can carry several megabytes before its first audio frame.
- Some tagging tools put an ID3 tag in front of the stream. The signature then no longer sits at byte 0, and a strict parser rejects a file that most players accept.
Technical details
| File name | sample-flac-1mb.flac |
|---|---|
| Format | FLAC (Free Lossless Audio Codec) |
| Extension | .flac |
| MIME type | audio/flac |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Binary |
| Signature | 66 4C 61 43 |
| SHA-256 | f6e01011aa95eb3def1b0cf53c8850f0f495d5fb513906a0ec3b425c4144b74b |
| 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-flac-1mb.flac 'https://www.sampletestfiles.com/downloads/flac/sample-flac-1mb.flac'
sha256sum sample-flac-1mb.flac # Linux
shasum -a 256 sample-flac-1mb.flac # macOSOn Windows, run Get-FileHash sample-flac-1mb.flac -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 FLAC file?
- 64 FLAC frames (5.9 s) of a synthesised musical phrase that repeats every eight seconds. The samples are stored verbatim, so the audio decodes bit for bit to the matching WAV data. 3 bytes of a standard PADDING metadata block bring the file to the exact size.
- Why are the FLAC samples about as large as the WAV samples?
- To reach an exact byte count, the samples store their audio in "verbatim" subframes, the uncompressed form FLAC falls back on when prediction does not help. The files are fully valid, and decode to exactly the same samples as the WAV files.