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.TIFF64

TIFF64

BigTIFF (64-bit TIFF offsets)

Data type	Image
MIME type	image/tiff
Developer	Aldus/Adobe (TIFF); BigTIFF extension designed within the LibTIFF community (based on an Adobe proposal)
Primary use cases	Very large raster images that exceed classic TIFF limits: whole-slide microscopy, large geospatial rasters (GeoTIFF), high-resolution scanning/archival masters, scientific multi-dimensional datasets stored in TIFF-like containers

What is the TIFF64 file format?

TIFF64 (BigTIFF) is a TIFF variant that uses 64-bit offsets to overcome the ~4 GB limit of classic TIFF, while keeping the same tag-based structure and TIFF features.

TIFF64 file characteristics

Data type	Image
MIME type	image/tiff
Compression	Optional; same concept as TIFF (compression is defined by tags, varies by file/profile)
Color depth	Wide range via tags (BitsPerSample/SampleFormat): from 1-bit bilevel to 8/16-bit integer per channel; 32-bit integer/float and higher are also used in scientific workflows
Color space	Flexible via tags: grayscale, RGB/RGBA, CMYK, YCbCr, Lab, and others depending on PhotometricInterpretation and related tags
Transparency support	Yes
Animation support	No
EXIF / Metadata support	Yes
Metadata	Same tag-based metadata model as TIFF: can carry extensive technical/semantic metadata via tags (including Exif-style tags in many workflows), as well as profiles/standards built on TIFF such as GeoTIFF (tool-dependent). BigTIFF primarily changes offset/counter sizes, not the metadata concept.
Structure type	Header + one or more IFDs (pages) + image data (strips/tiles) + tag value data; uses 64-bit offsets/counts where applicable
Standard / Specification	TIFF 6.0 (1992) + BigTIFF design/specification (LibTIFF / BigTIFF documentation)
Typical file size	Often multi-gigabyte for large scans/rasters; size depends on resolution, bit depth, number of pages, and compression
Year introduced	2004

Advantages

The TIFF64 file format offers several advantages that make it suitable for common use cases.

Breaks the ~4 GB classic TIFF limit via 64-bit offsets;
Keeps familiar TIFF tagging and workflows;
Supports tiles/strips and multi-page;
Suitable for huge, high bit-depth images used in science and GIS

Limitations

The TIFF64 file format has certain limitations that may affect its use in specific scenarios.

Detection relies on the header (version 43). BigTIFF requires BigTIFF-capable libraries;
Some software can open but may fail to save very large BigTIFFs. For web delivery, convert to PNG/WebP/AVIF;
For sharing large scientific rasters, ensure the receiving tool supports BigTIFF.

Compatibility

TIFF64 images are widely supported and can be viewed on most devices and platforms.

Supported platforms: Windows, macOS, Linux (via libraries/tools that support BigTIFF: LibTIFF, GDAL, scientific imaging stacks, etc.)
Supported devices: High-resolution scanners/cameras, microscopy/biomedical imaging, GIS/remote sensing pipelines, archival and research workflows
Browser support: No
Mobile support: No
Backward compatibility: No

Security considerations

Treat as untrusted input: malformed tags/offsets or crafted compressed data can exploit decoder bugs. Validate dimensions, strip/tile byte counts, and avoid unbounded allocations during parsing/decompression

License

Openly published specification; widely implemented in common imaging libraries (e.g., LibTIFF) and domain tools

TIFF64 usually refers to BigTIFF: an extension of TIFF that replaces 32-bit file offsets with 64-bit offsets, enabling very large images (multi-gigabyte and beyond). BigTIFF is identified by version 43 (0x2B) in the header (classic TIFF uses 42 / 0x2A), stores the offset-size as 8 bytes, and uses 64-bit offsets to the first IFD and tag data. In most other aspects it behaves like TIFF (same tags, compressions, tiling/strips, multi-page), but requires readers/writers that explicitly support BigTIFF.