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UDDF Format

UDDF (Universal Dive Data Format) is an open standard for storing dive computer data as XML. UDDF is designed to work across many different brands and dive log applications. Files use the .uddf extension.

File extension

Files in this format use the .uddf extension — for example, my_dive.uddf.

What is inside a UDDF file?

Because UDDF is an XML format, you can open a .uddf file in any text editor and read the contents. A typical file includes:

  • Diver information and equipment list
  • Dive profile (depth and time samples)
  • Maximum depth, bottom time, and water temperature
  • Tank information and gas mixes (for technical dives)
  • Decompression model data and tissue loadings

The XML structure is defined by a published specification, which means different software products can read each other's exports reliably.

Which software exports UDDF?

UDDF is an open standard, so many dive log programs can export it — for example, the open-source Subsurface, or Shearwater Cloud (see Exporting Dives from Shearwater Cloud). Check your dive log software's export options for "UDDF".

Because the format is shared, UDDF is a common way to move dive data between applications.

Importing UDDF files into DiveHub

DiveHub can read UDDF files directly. See Importing Dives for step-by-step instructions.

Open a UDDF file without importing it

Want to check what is inside a file first? The free UDDF viewer opens it in your browser and shows the dive details and depth graph. Your file is never uploaded.

Have a DL7 (.zxu) file instead? Use the DL7 viewer.