# gdal_translate > Convert raster data between different formats. > More information: . - Convert a raster dataset to JPEG format: `gdal_translate -of {{JPEG}} {{path/to/input.tif}} {{path/to/output.jpeg}}` - Assign a projection to a raster dataset: `gdal_translate -a_srs {{EPSG:4326}} {{path/to/input.tif}} {{path/to/output.tif}}` - Reduce the size of a raster dataset to a specific fraction: `gdal_translate -outsize {{40%}} {{40%}} {{path/to/input.tif}} {{path/to/output.tif}}` - Convert a GeoTiff to a Cloud Optimized GeoTiff: `gdal_translate {{path/to/input.tif}} {{path/to/output.tif}} -of COG -co COMPRESS=LZW`