LinuxWhat is the TFW file format?
.tfw files store georeferencing data for TIFF rasters in a GIS (Geographic Information System) context. Each .tfw file is a plain-text sidecar that sits alongside a .tif or .tiff image of the same base name, supplying the spatial anchoring that the image itself lacks.
.tfw files store information in plain text: exactly six numeric lines, one decimal number per line. These six values encode an affine transform that maps image pixels to real-world map coordinates:
- x pixel size (ground distance covered per pixel column)
- row rotation (typically
0.0for north-up imagery) - column rotation (typically
0.0for north-up imagery) - y pixel size (a negative value: ground distance per pixel row)
- x coordinate of the centre of the upper-left pixel
- y coordinate of the centre of the upper-left pixel
.tfw files are structurally identical in concept to other world files such as .jgw (JPEG) and .pgw (PNG) - the naming convention uses the image extension's first and last letters plus w. .tfw files are commonly used for storing precise satellite imagery, aerial photography, and scanned map data alongside their raster source.
The world-file convention was introduced by Esri in the early 1990s with ArcView. A .tfw carries no pixel data and no coordinate reference system name; only the six affine coefficients. The coordinate system is typically specified in a companion .prj file. Modern GIS workflows often embed georeferencing directly inside GeoTIFF tags instead, but .tfw sidecars remain widely supported for compatibility with non-GeoTIFF rasters and legacy pipelines.
Security & safety
RISK: LOWA TFW is a tiny plain-text file with six numbers - it cannot contain or execute code and carries no privacy data beyond the map coordinates of the associated image. The only real 'risk' is operational: deleting or mismatching the .tfw leaves the TIFF un-georeferenced (it opens as a plain picture but won't line up on the map), and editing the numbers carelessly shifts the image off-position. Keep the .tfw with its same-named image.
Format details
in a nutshellPrograms that open TFW files
Windows4 apps
QGIS
Open-source Add the .tif (Layer → Add Raster Layer); QGIS reads the sibling .tfw automatically to place it. The free, standard GIS tool. 
ArcGIS Pro
Paid Add the TIFF to a map; the .tfw is read automatically. ArcGIS Pro is Esri's current desktop product (ArcMap retired).
Any text editor (Notepad, Notepad++)
Free Open the .tfw to read or edit the six georeferencing numbers directly - it's plain text.
GDAL (gdalinfo / gdal_translate)
Open-source Command-line: 'gdalinfo map.tif' shows the georeferencing read from the .tfw; gdal_translate can embed it into a GeoTIFF. 
macOS1 app
Technical details
deep spec| File type | Plain-text georeferencing sidecar (world file) |
| MIME type | text/plain |
| Structure | Exactly six lines, each containing one decimal number representing an affine-transform coefficient |
| Typical file size | Under 200 bytes |
| Encoding | ASCII / UTF-8, no binary content |
| File signature (magic bytes) | None - no binary header; identified by six-line numeric content and a base filename matching a companion raster |
| Extension naming rule | First and last letter of the image extension plus 'w' - .tif → .tfw; .tiff → .tifw (less common) |
| Affine coefficients (line order) | A: x pixel size; D: row rotation; B: column rotation; E: negative y pixel size; C: x of upper-left pixel centre; F: y of upper-left pixel centre |
| Coordinate reference system | Not stored in the .tfw itself - supplied by a companion .prj file or embedded GeoTIFF tags |
| Associated raster format | .tif / .tiff - the .tfw must share the exact base filename with its TIFF image |
| Origin | Introduced by Esri with the ArcView world-file convention, early 1990s |
| Related world-file variants | .jgw (JPEG), .pgw (PNG), .bpw (BMP), .wld (generic world file accepted by many GIS applications) |
| Modern alternative | GeoTIFF - georeferencing embedded directly in TIFF tags, eliminating the need for a .tfw sidecar |
| Released | Early 1990s with Esri ArcView; the world-file convention is a de facto GIS standard |
| Latest version | N/A (a 6-line text convention; unchanged since introduction) |
| Open standard | Yes · royalty-free |
| Specification | en.wikipedia.org |
TFW conversions
Community Q&A
asked by usersNo questions yet - be the first to ask about TFW files.
