25 MB STL sample
An STL file of exactly 26,214,400 bytes. It is a valid STL 3D model (stereolithography) 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 STL file.
Download
sample-stl-25mb.stl
25 MB26,214,400 bytes
Download 25 MB STLCreated 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/stl
- SHA-256
057dae880307577253f5f55ac3460d243c9535cb60c00ff4e97d71b379cb7662- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
An ASCII STL solid, "terrain", of 142,274 triangular facets with unit normals, forming a height field 224 vertices wide. Lines of spaces before the endsolid line, which STL readers skip, bring the file to the exact size.
| Facets | 142,274 |
|---|---|
| Encoding | ASCII STL |
| Units | Not specified (model units) |
| Solids | 1 |
How the file begins
The opening lines of sample-stl-25mb.stl, exactly as they appear in the file.
00000000 73 6f 6c 69 64 20 74 65 72 72 61 69 6e 0a 20 20 |solid terrain. |
00000010 66 61 63 65 74 20 6e 6f 72 6d 61 6c 20 2d 30 2e |facet normal -0.|
00000020 34 34 32 37 20 30 2e 38 30 31 33 20 2d 30 2e 34 |4427 0.8013 -0.4|
00000030 30 32 34 0a 20 20 20 20 6f 75 74 65 72 20 6c 6f |024. outer lo|Preview
Creates the file in your browser and shows the first 64 KB of it.
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.
Use this file for
- Finding the first upload limit in a new stack
- Testing 3D model upload for print services
- Checking detection of ASCII and binary files
Testing notes for STL
- The .stl extension is also used for Windows certificate trust lists, which is why some servers label a 3D model application/vnd.ms-pki.stl.
- A binary file may start with the word "solid" in its free-text header, and many do. Detection has to test whether the file length equals 84 plus 50 bytes for each triangle, not just read the first five bytes.
Technical details
| File name | sample-stl-25mb.stl |
|---|---|
| Format | STL (STL 3D model (stereolithography)) |
| Extension | .stl |
| MIME type | model/stl |
| Size | 26,214,400 bytes (25 MB) |
| Kind | Text |
| Signature | 73 6F 6C 69 64 |
| SHA-256 | 057dae880307577253f5f55ac3460d243c9535cb60c00ff4e97d71b379cb7662 |
| 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-stl-25mb.stl # Linux
shasum -a 256 sample-stl-25mb.stl # macOSOn Windows, run Get-FileHash sample-stl-25mb.stl -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 STL file?
- An ASCII STL solid, "terrain", of 142,274 triangular facets with unit normals, forming a height field 224 vertices wide. Lines of spaces before the endsolid line, which STL readers skip, bring the file to the exact size.
- Are the STL samples ASCII or binary?
- The sized samples are ASCII STL, which can be padded to an exact byte count with blank lines. The curated library adds a binary STL file, a unit cube of 12 triangles.