Raster Operations — Crop, Resize, Resample and Extract Raster Bands Online
A set of free browser-based raster processing tools for GeoTIFF and other raster formats. Crop by extent, resize to new dimensions, resample with interpolation methods, and extract individual bands — all processed locally in your browser with no data uploads.
What are raster operations?
Raster operations process gridded data stored as arrays of pixel values. Unlike vector operations that work on individual features, raster tools apply transformations across the entire grid — changing its spatial extent, resolution, or band composition.
These tools cover the most common raster processing tasks: spatial subsetting (crop by bounding box), resolution change (resize and resample), and band extraction from multi-band rasters such as satellite imagery. All operations are performed using GDAL WebAssembly running entirely in the browser.
Common use cases
Extract an area of interest from satellite imagery
Crop a large GeoTIFF to the bounding box of your study area before uploading to a web map or running analysis, reducing file size and processing time.
Create overview tiles at reduced resolution
Resize or resample a high-resolution raster to create a smaller preview version for display purposes without loading the full dataset.
Extract spectral bands for vegetation index calculation
Pull individual red and near-infrared bands from a multi-band satellite image to calculate NDVI or other spectral indices in external tools.
Match raster resolution to other datasets
Resample a raster to a specific pixel size to match the resolution of another dataset for overlay analysis or comparison.
Prepare rasters for web map tile services
Crop, resize, and reproject rasters to fit web-compatible resolutions and projections before generating map tiles.
How to use
- 1
Choose the operation — select the raster tool that matches your task from the links above.
- 2
Upload your raster file — drop a GeoTIFF or other supported raster format onto the tool.
- 3
Configure parameters — set the bounding box, target resolution, resampling method, or band number as needed.
- 4
Download the result — the processed raster is returned as a GeoTIFF.
Available tools
| Tool | What it does |
|---|---|
| Crop GeoTIFF | Crop a GeoTIFF file by geographic bounding box. |
| Crop Raster | Crop any GDAL-supported raster format by bounding box. |
| Resize GeoTIFF | Change GeoTIFF pixel dimensions without resampling control. |
| Resample Raster | Resize raster with control over interpolation algorithm. |
| Extract Band | Pull a single band from a multi-band raster as a new GeoTIFF. |
| Split Raster Bands | Export each band of a multi-band raster as a separate GeoTIFF. |
Frequently asked questions
What is the difference between resize and resample?
Resize changes the pixel dimensions (width and height in pixels) of the raster. Resample controls the interpolation algorithm used when the pixel grid is recomputed — nearest-neighbour, bilinear, cubic, etc. Resample gives you more control over output quality.
Which resampling method should I use?
Use nearest-neighbour for categorical data (land use classes, classification maps) to avoid creating new values. Use bilinear or cubic for continuous data (elevation, temperature) to produce smoother results.
Will cropping change the coordinate reference system?
No — cropping only changes the spatial extent of the raster. The CRS, pixel size, and band composition are preserved. To change the CRS, use the Reproject GeoTIFF tool.
How do I know which bands are in my raster?
Use the GeoTIFF Inspector to view band count, data type, and no-data values before extracting bands. Satellite images often follow a known band order (e.g., Landsat 8 band 4 = red, band 5 = NIR).
Can I crop a raster that is not in WGS 84?
Yes — the crop tool accepts bounding box coordinates in the raster's native CRS. Alternatively, reproject the raster to WGS 84 first, then crop using geographic coordinates.