QTiles

QTiles is a Windows desktop editor and command-line renderer for turning a georeferenced raster image into standard XYZ map tiles.

Use it when you have a scanned map, site plan, floor plan, historic image, or other raster source and want to manually align it to real-world coordinates, inspect the fit, and export web-map-ready tiles plus TileJSON metadata.

• WPF editor for pairing image pixels with longitude/latitude control points.
• Interactive OpenStreetMap basemap for positioning and visual checks.
• Image pane with pan, zoom, drag/drop source selection, recent files, and marker editing.
• Affine and similarity transform solving with RMS and max error feedback.
• NetVips-based tile renderer for PNG, JPEG, and WebP output.
• Auto or manual zoom ranges, tile size, quality, resampling, overwrite, empty-tile skipping, and TileJSON options.
• CLI commands for scripting project creation, validation, solving, rendering, and TileJSON generation.
• Per-user WiX MSI packaging for the WPF editor and CLI.

QTiles renders only your source raster. The editor basemap is for alignment and preview context; basemap tiles are not baked into the rendered output.

QTiles currently focuses on manual raster georeferencing and folder-based XYZ tile output:

tiles/{z}/{x}/{y}.png
tiles/tilejson.json

It is not a full GIS conversion suite. MBTiles, PMTiles, GeoTIFF export, vector tiles, batch reprojection, and automated ground-control-point detection are outside the current implementation.

When a release is available, download QTiles-X.Y.Z-x64.msi from the GitHub Releases page.

The MSI is self-contained, installs per user under %LOCALAPPDATA%\Programs\QTiles, and does not require administrator rights or a separate .NET Desktop Runtime installation.

The release workflow is prepared for the package identifier Code-iX.QTiles. Once the package exists in the winget community repository, install it with:

winget install Code-iX.QTiles

Until a release package is published, build from source.

1. Start QTiles.exe.
2. Open an existing qtiles.yaml project or choose a source image.
3. Add control points by matching positions on the world map and source image.
4. Use at least 3 enabled points for an affine transform; 4 or more points are recommended so residual errors can be reviewed.
5. Choose output directory, format, zoom range, quality, and resampling options.
6. Render tiles, then enable preview to inspect the generated tile overlay.

Supported source-image extensions in the editor are .png, .jpg, .jpeg, .tif, .tiff, .bmp, and .webp.

Use QTiles.Cli.exe from the installer or publish folder. If you pack and install the CLI as a .NET tool, the command name is qtiles; the editor command still expects QTiles.exe to be available next to the CLI.

QTiles.Cli.exe init --image .\source-map.png --out .\qtiles.yaml --name "Source map"
QTiles.Cli.exe validate .\qtiles.yaml
QTiles.Cli.exe solve .\qtiles.yaml
QTiles.Cli.exe render .\qtiles.yaml --out .\tiles --format png --min-zoom 10 --max-zoom 16
QTiles.Cli.exe tilejson .\qtiles.yaml
QTiles.Cli.exe editor .\qtiles.yaml

Useful render overrides:

QTiles.Cli.exe render .\qtiles.yaml `
  --out .\tiles `
  --format webp `
  --quality 90 `
  --resampling nohalo `
  --overwrite `
  --verbose

Use --json with validate, solve, or render for machine-readable output. Use --no-tilejson on render to skip TileJSON creation.

QTiles projects are YAML files. Relative paths are resolved from the project file location, so projects can be moved with their image assets and output folder.

version: 1
project:
  name: Example map
source:
  image: ./source-map.png
georeference:
  inputCrs: EPSG:4326
  internalCrs: EPSG:3857
  transform:
    type: affine
    solve: least-squares
  controlPoints:
    - id: 1
      enabled: true
      image:
        x: 125.0
        y: 210.0
      world:
        lon: 13.404954
        lat: 52.520008
    - id: 2
      enabled: true
      image:
        x: 900.0
        y: 220.0
      world:
        lon: 13.414954
        lat: 52.520008
    - id: 3
      enabled: true
      image:
        x: 890.0
        y: 740.0
      world:
        lon: 13.414954
        lat: 52.510008
render:
  autoZoom: true
  format: png
  tileSize: 256
  resampling: nohalo
output:
  directory: ./tiles
  tileJson: true
  tileJsonPath: ./tiles/tilejson.json

Supported transform types:

• affine: requires at least 3 enabled control points.
• similarity: requires at least 2 enabled control points.

Supported render formats are png, jpg, jpeg, and webp. Supported resampling values are nearest, bilinear, bicubic, lbb, nohalo, and vsqbs.

Requirements:

• Windows 10 or newer for the WPF editor and MSI.
• .NET 10 SDK for build and test.

git clone https://github.com/Matt-17/QTiles.git
cd QTiles

dotnet restore .\QTiles.slnx
dotnet build .\QTiles.slnx --configuration Release
dotnet test .\QTiles.slnx --configuration Release --no-build

Run the editor from source:

dotnet run --project .\QTiles\QTiles.csproj -- .\qtiles.yaml

Run the CLI from source:

dotnet run --project .\QTiles.Cli\QTiles.Cli.csproj -- validate .\qtiles.yaml
dotnet run --project .\QTiles.Cli\QTiles.Cli.csproj -- render .\qtiles.yaml

Build the MSI:

dotnet build .\QTiles.Installer\QTiles.Installer.wixproj --configuration Release -p:ProductVersion=1.0.0

The installer build publishes both QTiles.exe and QTiles.Cli.exe as self-contained win-x64 single-file executables before packaging, then writes the release MSI to artifact\release\QTiles-X.Y.Z-x64.msi.

QTiles.Core       YAML, validation, Web Mercator math, transforms, and NetVips rendering
QTiles.Cli        command-line host and dotnet tool package
QTiles            Windows WPF editor
QTiles.Installer  per-user WiX MSI
QTiles.Tests      MSTest coverage for core and CLI behavior

Releases are produced by pushing a tag in the form vX.Y.Z.

The GitHub Actions release workflow restores, builds, tests, publishes self-contained win-x64 editor and CLI binaries, builds QTiles-X.Y.Z-x64.msi, creates a GitHub Release, and uses the annotated tag body as the release notes.

Keep the installer UpgradeCode stable across releases.

QTiles is licensed under the MIT License.