25 MB FLAC sample

A FLAC file of exactly 26,214,400 bytes. It is a valid Free Lossless Audio Codec file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 25 MB sample, test or dummy FLAC file.

sample-flac-25mb.flac

25 MB26,214,400 bytes

Download 25 MB FLAC

Created in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.

Type: audio/flac
SHA-256: 44c2e40386725cbaf61c3f88629ed56bfe4bf03fd89136827c311d9252c4b0cb
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

1,599 FLAC frames (2 min 29 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	2 min 29 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-25mb.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 00 00 00 |fLaC..."........|
00000010  00 00 0a c4 42 f0 00 63  ee c7 33 6e 78 20 2f b4 |....B..c..3nx /.|
00000020  5f 05 98 50 07 49 46 66  77 c1 04 00 00 78 19 00 |_..P.IFfw....x..|
00000030  00 00 53 61 6d 70 6c 65  54 65 73 74 46 69 6c 65 |..SampleTestFile|

Preview

Creates the file in your browser and shows it here. Nothing large is downloaded from our server.

Where 25 MB matters

A 26,214,400-byte file, 25 MB in the binary units that operating systems and upload limits use. It is useful wherever a form, an API gateway, a storage quota or a mail server is configured with a limit of about this size.

All 25 MB sample files

Use this file for

Testing image resizing and memory use
Verifying duration and tag reading
Testing that a decode matches the stored MD5 checksum

Testing notes for FLAC

The MD5 checksum in STREAMINFO lets software prove that a decode is correct, yet few applications check it. A value of all zeros means the encoder did not record one.
Cover art lives in the metadata, so a three-minute song can carry several megabytes before its first audio frame.

FLAC format reference

Technical details

File name	sample-flac-25mb.flac
Format	FLAC (Free Lossless Audio Codec)
Extension	.flac
MIME type	audio/flac
Size	26,214,400 bytes (25 MB)
Kind	Binary
Signature	66 4C 61 43
SHA-256	44c2e40386725cbaf61c3f88629ed56bfe4bf03fd89136827c311d9252c4b0cb
Created	2026-10-23
Validation	See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility.
Preview	Available on this page
Source	Generated in your browser by this site's generator; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Audio

Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Verify your copy

This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.

sha256sum sample-flac-25mb.flac     # Linux
shasum -a 256 sample-flac-25mb.flac # macOS

On Windows, run Get-FileHash sample-flac-25mb.flac -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.

Related files

Questions about this file

Is this file exactly 25 MB?: Yes. It is 26,214,400 bytes, which is 25 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 25 MB FLAC file?: 1,599 FLAC frames (2 min 29 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.

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