25 KB glTF sample
A glTF file of exactly 25,600 bytes. It is a valid GL Transmission 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 25 KB sample, test or dummy glTF file.
Download
sample-gltf-25kb.gltf
25 KB25,600 bytes
Download 25 KB glTFCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- model/gltf+json
- SHA-256
8b6993168d85c9bc50b27ec365c540a681c30000bc5a082e4eca374cfb365b28- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
A glTF 2.0 scene with one mesh: a height-field terrain of 529 vertices and 968 triangles, stored in a base64 buffer inside the JSON. A padding string in the top-level "extras" member brings the file to the exact size.
| Vertices | 529 |
|---|---|
| Triangles | 968 |
| glTF version | 2.0 |
| Buffers | 1 (embedded, base64) |
| Materials | None (default) |
How the file begins
The opening lines of sample-gltf-25kb.gltf, exactly as they appear in the file.
00000000 7b 22 61 73 73 65 74 22 3a 7b 22 76 65 72 73 69 |{"asset":{"versi|
00000010 6f 6e 22 3a 22 32 2e 30 22 2c 22 67 65 6e 65 72 |on":"2.0","gener|
00000020 61 74 6f 72 22 3a 22 53 61 6d 70 6c 65 54 65 73 |ator":"SampleTes|
00000030 74 46 69 6c 65 73 20 73 61 6d 70 6c 65 20 66 69 |tFiles sample fi|Preview
Shows the file contents.
Where 25 KB matters
A 25,600-byte file: the size of a small web image or a short document. 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) | 25 KB needs at least two flights of packets on a new connection. |
| Base64 encoding | Adds 33 percent | A 25 KB file becomes about 34 KB inside JSON or an email. |
Use this file for
- Checking thumbnail and icon handling
- Verifying axis and unit conversion from other formats
- Load-testing rendering with large meshes
Testing notes for glTF
- A file can declare extensions it requires, such as Draco mesh compression. A loader without that extension has to refuse the file.
- A .gltf file often refers to separate .bin and texture files. Uploading the JSON alone gives a model with no geometry. The samples here embed their data, so one file is enough.
Technical details
| File name | sample-gltf-25kb.gltf |
|---|---|
| Format | glTF (GL Transmission Format) |
| Extension | .gltf |
| MIME type | model/gltf+json |
| Size | 25,600 bytes (25 KB) |
| Kind | Text |
| SHA-256 | 8b6993168d85c9bc50b27ec365c540a681c30000bc5a082e4eca374cfb365b28 |
| 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 | 3D Models |
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-gltf-25kb.gltf # Linux
shasum -a 256 sample-gltf-25kb.gltf # macOSOn Windows, run Get-FileHash sample-gltf-25kb.gltf -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 KB?
- Yes. It is 25,600 bytes, which is 25 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 25 KB glTF file?
- A glTF 2.0 scene with one mesh: a height-field terrain of 529 vertices and 968 triangles, stored in a base64 buffer inside the JSON. A padding string in the top-level "extras" member brings the file to the exact size.
- Do the glTF samples need a separate .bin file?
- No. The vertex and index data are embedded in the JSON as a base64 data URI, so each sample is a single self-contained file.