20 MB WAV sample

A WAV file of exactly 20,971,520 bytes. It is a valid Waveform Audio File Format file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy WAV file.

sample-wav-20mb.wav

20 MB20,971,520 bytes

Download 20 MB WAV

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

Type: audio/wav
SHA-256: f707ec48c208fa153f694fd44f9a3996a7e893fd4faddc96c10601f670dec881
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

1 min 59 s of a synthesised eight-second musical phrase that repeats, as uncompressed 16-bit stereo PCM behind a 44-byte RIFF header. No padding is needed: the sample count sets the size.

Duration	1 min 59 s
Sample rate	44,100 Hz
Channels	2 (stereo)
Bit depth	16-bit PCM
Bit rate	1,411 kbit/s

First bytes of the file

The first 64 bytes of sample-wav-20mb.wav as a hex dump: offset, bytes, then the same bytes as text. The WAV signature is 52 49 46 46 ?? ?? ?? ?? 57 41 56 45.

00000000  52 49 46 46 f8 ff 3f 01  57 41 56 45 66 6d 74 20 |RIFF..?.WAVEfmt |
00000010  10 00 00 00 01 00 02 00  44 ac 00 00 10 b1 02 00 |........D.......|
00000020  04 00 10 00 64 61 74 61  d4 ff 3f 01 00 00 00 00 |....data..?.....|
00000030  02 00 02 00 0a 00 09 00  15 00 13 00 2a 00 27 00 |............*.'.|

Preview

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

Where 20 MB matters

A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Microsoft Outlook	20 MB of attachments by default for internet mail accounts	This file is right at the limit; add a second attachment and it is exceeded.
Gmail	25 MB per message	Under the limit, although email encoding adds about a third in transit.
GitHub web uploads	25 MiB per file added through the browser	Accepted. Pushing with Git allows larger files.
Cloudflare Pages assets	25 MiB per file	The largest round size that can be served as a static asset.
Amazon API Gateway	10 MB payload	Rejected; the upload has to go directly to object storage.
ASP.NET Core (Kestrel)	About 28.6 MB request body by default	Accepted with room for the multipart overhead.

All 20 MB sample files

Use this file for

Measuring download speed from your own server or CDN
Testing speech-to-text input handling
Testing large audio uploads

Testing notes for WAV

Not every WAV file has a 44-byte header; extra chunks may appear before the audio data, so parsers must walk the chunk list.
Three MIME types are in common use: audio/wav, audio/x-wav and audio/vnd.wave. Allow-lists should accept all of them.

WAV format reference

Technical details

File name	sample-wav-20mb.wav
Format	WAV (Waveform Audio File Format)
Extension	.wav
MIME type	audio/wav
Size	20,971,520 bytes (20 MB)
Kind	Binary
Signature	52 49 46 46 ?? ?? ?? ?? 57 41 56 45
SHA-256	f707ec48c208fa153f694fd44f9a3996a7e893fd4faddc96c10601f670dec881
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-wav-20mb.wav     # Linux
shasum -a 256 sample-wav-20mb.wav # macOS

On Windows, run Get-FileHash sample-wav-20mb.wav -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 20 MB?: Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 20 MB WAV file?: 1 min 59 s of a synthesised eight-second musical phrase that repeats, as uncompressed 16-bit stereo PCM behind a 44-byte RIFF header. No padding is needed: the sample count sets the size.
What format are the WAV samples?: 16-bit stereo PCM at 44,100 Hz with the canonical 44-byte header.

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