Download · Vellum 1.0.1 · free and open source

Download Vellum.

It comes in two pieces: Vellum, the app where you see your map, and Vellum Bridge, the mod that takes your city out of the game. Start with the app.

Step 1 of 2 · the app

Vellum on Windows with Pepper Lake, the sidebar and a place card open
How it looks on Windowsin the style of Mica and Acrylic

Every platform

Windows, macOS and Linux.

All downloads on GitHub Releases

Step 2 · essential: Vellum Bridge, in the game. Go to step 2

Step 2 of 2 · essential

Now, Vellum Bridge.

Without Bridge, Vellum has nothing to draw. It's the mod that takes your city out of Cities: Skylines: in the game you press the Bridge button or Ctrl + Shift + E and it saves a .vellummap file that Vellum opens. It works offline and only reads: nothing in your save changes.

With Steam · recommended

Subscribe on Steam Workshop

Steam installs it and keeps it up to date. Then, in the game, enable it in Content Manager → Mods.

Subscribe on Steam Workshop

Without Workshop

Manual install

For copies of the game without Workshop, like the Epic Games one. It is the same Bridge as the Workshop one.

Download Bridge 1.0.0

VellumBridge-1.0.0.zip · 0.1 MB

  1. Download the zip and unzip it: inside is a VellumBridge folder.
  2. Copy that folder into the game's mods folder:
    • Windows%LOCALAPPDATA%\Colossal Order\Cities_Skylines\Addons\Mods
    • macOS~/Library/Application Support/Colossal Order/Cities_Skylines/Addons/Mods

    On macOS the Library folder is hidden: in Finder choose Go → Go to Folder… and paste the path.

  3. Open Cities: Skylines and, in Content Manager → Mods, turn Vellum Bridge on.

If Windows warns you

Windows may warn you. That's normal.

Vellum isn't code-signed yet. The first time you open the installer, Windows will warn you about an unknown publisher: choose More info → Run anyway. If you'd rather skip that, Microsoft Store installs it signed.

  1. 1 · click “More info”

    Windows protected your PC

    Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.

    More info

    Don't run

  2. 2 · “Run anyway”

    Windows protected your PC

    App: Vellum_1.0.1_x64-setup.exe

    Publisher: Unknown publisher

    Run anywayDon't run

  3. 3 · done

    The Vellum installer opens

    Follow it to the end and Vellum is installed.

A recreation of the Windows dialog, not a screenshot.

  • It's open source

    All the code is on GitHub, and the installers are built there, in the open. See the repository

  • You can check it

    Every file has its SHA256 fingerprint: if it matches the published one, it is exactly the file I uploaded. Verify the download

  • Rather not see it?

    Install from Microsoft Store: the app is signed and there is no warning.

Requirements

What you need.

WindowsWindows 10 version 1809 (10.0.17763) or later, 64-bit (x64). It uses WebView2: if it is missing, Vellum tells you.
macOSmacOS 10.15 or later, on Apple Silicon or Intel.
Linuxx86_64: Debian and Ubuntu (.deb), Fedora and RHEL (.rpm) and other distributions with AppImage.
The gameCities: Skylines (the first one), with Vellum Bridge to export your city; for now, Bridge installs from Steam Workshop. To open a .vellummap or a .cslmap you already have, you don't need the game.

How to update

Up to date, without chasing versions.

  • .exe and .msi installers · .dmg · AppImage

    Vellum tells you

    Vellum checks for new versions when it starts and offers to install them; you can turn that off in Preferences. You can also download it again here.

  • Microsoft Store

    It updates itself

    The Store takes care of it, like any other app.

  • .deb and .rpm

    Install over it

    Download the new version from this page and install it over the old one.

  • Vellum Bridge

    Steam keeps it current

    With Workshop, Steam updates it on its own when you open the game.

Verify the downloadoptional · SHA256

Every file has a SHA256 fingerprint. Compute the one of the file you downloaded and compare it with this list: if they match, it is exactly the file I published, unchanged on the way. Run the command in your downloads folder with the file you downloaded; Get-FileHash prints the fingerprint in uppercase, so compare them ignoring case.

Windows (PowerShell)
Get-FileHash .\Vellum_1.0.1_x64-setup.exe
macOS
shasum -a 256 Vellum_1.0.1_universal.dmg
Linux
sha256sum Vellum_1.0.1_amd64.deb
Vellum_1.0.1_x64-setup.exeWindows · installer43bd43f5edff7b5cf3a42132489b8e657f7ed7d36e111880c9b61a9a2fd90ea1
Vellum_1.0.1_x64_en-US.msiWindows · MSI in Englishcc09155d327ab175b41c560115f193cdaa1789550920bb77c30b17c668b92b06
Vellum_1.0.1_x64_es-ES.msiWindows · MSI in Spanish744a2318c621dc5132c84650f00c8596e8114b42e61f9e0fa23385342c0534cf
Vellum_1.0.1_universal.dmgmacOS · universal5263b9d82c8eea7db7fed0bd0f66dd71a5551fb19ed4d988e35b344af932a64e
Vellum_1.0.1_amd64.debLinux · Debian and Ubuntufdb402bb797509f948295ebec7ba3712a6e8d259135f7f8cc830b515dc4d2142
Vellum_1.0.1_amd64.AppImageLinux · other distributions4c06f838c69daadf28b3171bfd6c15f8b9105730938d8d0c53e52bbbca8c604a
Vellum-1.0.1-1.x86_64.rpmLinux · Fedora and RHELe0f4cfeea317faeb4a9d96dc315496aab9822d9f87abec24c4cd87def9b04c25

After the download

First time? Here is what comes next.

From nothing to seeing your city in three steps:

  1. Install Vellum Bridge in the game, from Steam Workshop.
  2. Export your city: in the game, press the Bridge button or Ctrl + Shift + E. It saves a .vellummap, one folder per city.
  3. Open it in Vellum: drop the .vellummap on the window or use Ctrl + O.

Coming from CSL Map View? Vellum opens your .cslmap files too.

Open the quick guideWhat's new in 1.0.1

Don't forget

Vellum Bridge, in the game

Without it, Vellum has nothing to open.

Go to step 2