30 MB glTF sample

A glTF file of exactly 31,457,280 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 30 MB sample, test or dummy glTF file.

sample-gltf-30mb.gltf

30 MB31,457,280 bytes

Download 30 MB glTF

Created 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: 031c6030941ec157050fcf9218e372b9c970d6e7d89ad58452c29c58db1bb173
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 524,176 vertices and 1,045,458 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	524,176
Triangles	1,045,458
glTF version	2.0
Buffers	1 (embedded, base64)
Materials	None (default)

How the file begins

The opening lines of sample-gltf-30mb.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

Creates the file in your browser and shows the first 64 KB of it.

Where 30 MB matters

A 31,457,280-byte file, 30 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 30 MB sample files

Use this file for

Finding the first upload limit in a new stack
Testing 3D upload and web preview
Checking loaders with embedded and external buffers

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.

glTF format reference

Technical details

File name	sample-gltf-30mb.gltf
Format	glTF (GL Transmission Format)
Extension	.gltf
MIME type	model/gltf+json
Size	31,457,280 bytes (30 MB)
Kind	Text
SHA-256	031c6030941ec157050fcf9218e372b9c970d6e7d89ad58452c29c58db1bb173
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-30mb.gltf     # Linux
shasum -a 256 sample-gltf-30mb.gltf # macOS

On Windows, run Get-FileHash sample-gltf-30mb.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 30 MB?: Yes. It is 31,457,280 bytes, which is 30 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 30 MB glTF file?: A glTF 2.0 scene with one mesh: a height-field terrain of 524,176 vertices and 1,045,458 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.

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