10 KB BIN sample file
A BIN file of exactly 10,240 bytes. It is a valid Binary test file file, generated for this site and checked with an independent parser.
Download
sample-bin-10kb.bin
10 KB10,240 bytes
Download 10 KB BINDirect download. No sign-up and no waiting.
- Type
- application/octet-stream
- SHA-256
64f54c3f7a8245c832730c3ae85b5c8aa2fefaf5b639e197eae549cb62258113- Direct URL
https://sampletestfiles.com/downloads/bin/sample-bin-10kb.bin
What is in this file
10,240 pseudo-random bytes from a seeded generator, so every build of the file is identical and compression cannot shrink it.
| Content | Pseudo-random bytes |
|---|---|
| Compressible | No |
| Structure | None |
First bytes of the file
The first 64 bytes of sample-bin-10kb.bin as a hex dump: offset, bytes, then the same bytes as text.
00000000 ef 54 25 8c ae 9e ff ea 2f 68 91 e2 ff 81 18 5c |.T%...../h.....\|
00000010 24 77 ef 6c 1f bf 47 c0 c3 d6 af 27 b7 ef a1 51 |$w.l..G....'...Q|
00000020 c9 d8 9f 60 e4 5a cf ad 19 ec e3 d1 c7 9e 85 df |...`.Z..........|
00000030 42 90 5b c3 62 04 56 84 c1 66 c2 b8 2f 0c 86 e3 |B.[.b.V..f../...|Preview
BIN files cannot be shown in a browser. Download the file and open it with curl, wget and browser download managers.
Where 10 KB matters
A 10,240-byte file that still arrives in the first round trip of a new connection. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| TCP initial congestion window | About 14.6 KB (10 segments) | A 10 KB response fits in the first flight of packets; the 25 KB sample does not. |
| nginx and Apache request headers | 8 KB per header line by default | Data this large must go in the request body. |
| webpack asset modules | 8 KB by default | Assets over the threshold are emitted as files instead of data URIs. |
Use this file for
- Checking thumbnail and icon handling
- Checking resumable and chunked uploads
- Verifying checksums after transfer
Testing notes for BIN
- A file of zeros, as produced by many quick commands, compresses to almost nothing, which makes transfers look far faster than they are.
- Because application/octet-stream says nothing about content, strict upload filters reject these files. That is itself a useful test.
Technical details
| File name | sample-bin-10kb.bin |
|---|---|
| Format | BIN (Binary test file) |
| Extension | .bin |
| MIME type | application/octet-stream |
| Size | 10,240 bytes (10 KB) |
| Kind | Binary |
| SHA-256 | 64f54c3f7a8245c832730c3ae85b5c8aa2fefaf5b639e197eae549cb62258113 |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Not available for this format; details only |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Testing |
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-bin-10kb.bin 'https://sampletestfiles.com/downloads/bin/sample-bin-10kb.bin'
sha256sum sample-bin-10kb.bin # Linux
shasum -a 256 sample-bin-10kb.bin # macOSOn Windows, run Get-FileHash sample-bin-10kb.bin -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 10 KB?
- Yes. It is 10,240 bytes, which is 10 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 KB BIN file?
- 10,240 pseudo-random bytes from a seeded generator, so every build of the file is identical and compression cannot shrink it.
- Is a .bin sample safe to download?
- Yes. It is inert data: random bytes that are not executable and have no structure for any program to interpret.