# About Mes3D

> Mes3D is a free, private, browser-based 3D model viewer for STL, OBJ, 3MF, STEP and more. Who we are, what it opens, and why nothing you open is ever uploaded.

Source: https://freestlviewer.com/about-us/

## What Mes3D is

Mes3D is a free online viewer for 3D models. Open a file and it renders
instantly in your browser — rotate, zoom and pan it, switch to preset views,
measure distances, and read off dimensions, volume, surface area, estimated
print weight, watertightness and overhangs. STL, OBJ, PLY, glTF, GLB, 3MF, FBX,
DAE, 3DS, USDZ, AMF, STEP/STP, 3DM, ABC, OFF and USD files are all detected
automatically.

## Opens files the way your tools save them

Models often arrive as more than one clean mesh, so Mes3D reads them as they
come out of your slicer, CAD or 3D software:

- 3MF projects from Bambu Studio and OrcaSlicer open with every part in place,
  and colours stored in a 3MF are shown.
- OBJ models show their MTL materials and textures, and glTF scenes load their
  `.bin` data, when you open them together with those files or as one ZIP.
- If a file the model needs is missing, Mes3D names it. A 3MF that only holds
  sliced G-code is recognised, so you know to open the project file instead.
- Rhino 3DM, Alembic (ABC), OFF and USD files open in the browser like any
  other format.

## Your files stay on your device

There is no upload step, because there is no server to upload to. Every file is
parsed and rendered by your own browser, so confidential models, client work
and prototypes never leave your machine. That also means it works offline once
the page has loaded.

## Free, with no account

Viewing 3D models here is free — no sign-up, no subscription and no limits —
and on a computer the measurement, analysis, snapshot and appearance tools are
free too. We built Mes3D because checking a mesh before printing should not
require installing desktop software.

## On your phone, too

On a phone or tablet the browser handles viewing, rotating, zooming and
dimensions, while the advanced tools live in the Mes3D app for iOS and Android:
measuring, mesh analysis with wall-thickness and problem-area views,
cross-sections, AR and snapshots. Both apps are free to download and some of
their features are paid.

## Edit and export in the app

The Mes3D app can also change a model before you print or share it:

- Resize it to exact dimensions or by percentage, including a one-tap
  inch-to-millimetre fix.
- Rotate it in 90° steps and cut it along a plane.
- Set the unit a file was saved in, so every size and measurement reads
  correctly.
- Export the result as STL, OBJ or 3MF (3MF keeps the colours), share it, or
  save it to your library as a copy — the original file is never overwritten.