Due to industrial action by the University and College Union on Wednesday 25 and Thursday 26 May there may be a delay in responding to queries on these dates.




The UK Data Archive works with different data formats for different purposes. There are optimal data formats that are used for long-term preservation of data.

This table contains guidance on file formats accepted by the UK Data Archive for deposited data. We welcome queries from researchers about appropriate file formats for working and preservation, particularly early in the research process.

Type of data Acceptable formats for sharing, reuse and preservation Other acceptable formats for data preservation

Quantitative tabular data with extensive metadata

a dataset with variable labels, code labels, and defined missing values, in addition to the matrix of data

SPSS portable format (.por)

delimited text and command ('setup') file (SPSS, Stata, SAS, etc.) containing metadata information

some structured text or mark-up file containing metadata information, e.g. DDI XML file
proprietary formats of statistical packages e.g. SPSS (.sav), Stata (.dta)
MS Access (.mdb/.accdb)

Quantitative tabular data with minimal metadata

a matrix of data with or without column headings or variable names, but no other metadata or labelling

comma-separated values (CSV) file (.csv)

tab-delimited file (.tab)

including delimited text of given character set with SQL data definition statements where appropriate


delimited text of given character set - only characters not present in the data should be used as delimiters (.txt)

widely-used formats, e.g. MS Excel (.xls/.xlsx), MS Access (.mdb/.accdb), dBase (.dbf) and OpenDocument Spreadsheet (.ods)

Geospatial data

vector and raster data

ESRI Shapefile (essential - .shp, .shx, .dbf, optional - .prj, .sbx, .sbn)

geo-referenced TIFF (.tif, .tfw)

CAD data (.dwg)

tabular GIS attribute data


ESRI Geodatabase format (.mdb)

MapInfo Interchange Format (.mif) for vector data

Keyhole Mark-up Language (KML) (.kml)

Adobe Illustrator (.ai), CAD data (.dxf or .svg)

binary formats of GIS and CAD packages

Qualitative data


eXtensible Mark-up Language (XML) text according to an appropriate Document Type Definition (DTD) or schema (.xml)

Rich Text Format (.rtf)

plain text data, ASCII (.txt)

Hypertext Mark-up Language (HTML) (.html)

widely-used proprietary formats, e.g. MS Word (.doc/.docx)

some proprietary/software-specific formats, e.g. NUD*IST, NVivo and ATLAS.ti


Digital image data TIFF version 6 uncompressed (.tif)

JPEG (.jpeg, .jpg) but only if created in this format

TIFF (other versions) (.tif, .tiff)

Adobe Portable Document Format (PDF/A, PDF) (.pdf)

standard applicable RAW image format (.raw)

Photoshop files (.psd)

Digital audio data

Free Lossless Audio Codec (FLAC) (.flac)

MPEG-1 Audio Layer 3 (.mp3) but only if created in this format

Audio Interchange File Format (AIFF) (.aif)

Waveform Audio Format (WAV) (.wav)

Digital video data

MPEG-4 (.mp4)

motion JPEG 2000 (.mj2)



Documentation and scripts Rich Text Format (.rtf)
PDF/A or PDF (.pdf)
HTML (.htm)
OpenDocument Text (.odt)

plain text (.txt)

some widely-used proprietary formats, e.g. MS Word (.doc/.docx) or MS Excel (.xls/.xlsx)

XML marked-up text (.xml) according to an appropriate DTD or schema, e.g. XHMTL 1.0

You may need to convert your data files to a preservation file format.


If you are unsure of the suitability of your file formats for the data you want to deposit with the Archive, please contact us.