Recommended Formats

Publication Year: 08. 04. 2017    Date of last inspection: 08. 04. 2017

We recommend preparing data files in formats that are independent of software and computer platforms. Only for recommended file formats, we can assure long-term storage and access in the ADP.

At the point of ingest (receiving the submitted materials from the depositor) the ADP checks the submitted data formats and, if needed, either transforms them into appropriate formats or asks the depositor to submit the materials in our recommended file formats.


Type of Materials Recommended Formats Other Formats
Structured text files (Study Description Form, Questionnaire, Codebook etc.)

Structured metadata description of the questionnaire (*.xml), according to the DDI or CAI software (*.bmi)

 *.rtf or outer textual format (*.doc, *.txt, etc.)

Printed version of the material

 *.pdf or other graphic format

Structured numeric data (Data file)

SPSS (*.por, *.sav)

ASCI (*.txt metric or a data file, equipped with labels + computer-readable description of the data file with the names and categories of variables)

Other statistical packages (e.g. STATA, R, Microsoft Excel)

Tables (*.xls etc.)


Freely formulated textual materials for tracking original documentation (Questionnaire, Instructions for Interviewers, Address to Respondents, copies of research reports) *.pdf or another graphic format + printed version *.rtf or other textual format (*.doc, *.txt, etc.)
Textual data

Rich Text Format (.rtf)

plain text, ASCII (.txt)

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

Hypertext Mark-up Language (.html)

Common formats: MS Word (.doc/.docx)

OpenDocument Text (.odt)

Software specific formats: NUD*IST, Nvivo, ATLAS.ti in MAXQDA

Still image

TIFF 6.0 uncompressed (*.tif),

PEG (*.jpeg, *.jpg, .*jp2),

GIF (*.gif),

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

RAW image format (*.raw),

Photoshop files (*.psd),

BMP (*.bmp),

PNG (*.png),

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

Audio data Free Lossless Audio Codec (FLAC) (.flac)

MPEG-1 Audio Layer 3 (.mp3), if such originally

Audio Interchange File Format (.aif)

Waveform Audio Format (.wav)

Video data


MPEG-4 (mp4)

OGG video (.ogv, .ogg)

Motion JPEG2000 (.mj2)

AVCHD video (.avchd)


Waveform Audio Format (.wav)

  How to cite this page?

Social Science Data Archives. YEAR. Recommended Formats. Accessed: (DD. month year).


27. November 2023
15. Evropska konferenca uporabnikov DDI letos v Sloveniji


International Social Survey Programme (ISSP), Role of Government I, GESIS

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ADP is part of the Social Sciences Research Institute of the Faculty of Social Sciences. The Slovenian Research Agency provides funding of the ADP within the infrastructure program "Network of Research and Infrastructural Centres" The ADP is a member of the umbrella organization of the European Social Science Data Archives CESSDA ERIC. © ADP (ISSN 2385-9415) | 1997 - 2017 |