Recommended File Formats
Files that are stored in open formats or formats that are ubiquitous are easier to share, preserve, and reuse. The table below provides a summary of recommended and acceptable file formats for common file types. If you wish to deposit data in DataShare please prepare your files based on these recommendations or contact our staff for help.
Values in bold indicate the best choice if multiple options are available.
| File Type | Recommended Formats | Acceptable Formats |
|---|---|---|
| Audio | Wave (.wav); FLAC (.flac), AIFF (.aiff, .aif); | MPEG (.mp3), FLAC, Ogg Vorbus (.ogg), |
| Database | eXistdb database files (.xml files in a hierarchy of directories) | |
| Image: Pixel | uncompressed Tagged Image File Format (.tif or .tiff) or PNG (.png) | JPEG (low/no compression); BMP, |
| Image: Vector | Scalable Vector Graphics (.svg) | |
| Tabular data | Comma Separated Values (.csv) in ASCII or Unicode. | Microsoft Excel (.xlsx 2007 or later), Open Office (.ods) |
| Text: Formatted | PDF/A (.pdf); Rich Text (.rft) | PDF (.pdf), Microsoft Word (.docx), Open Office (.odt) |
| Text: Plain | Plain Text, ASCII (.txt); Plain Text, UTF-8 (.txt) | |
| Text: Markup |
SGML w/valid DTD (.smg, .sgml); XML w/valid DTD (.xml); KML (.kml); JSON (.json) | HTML (.html, .htm) |
| Video | MPEG-4 (.mp4) | AVI (.avi); QuickTime (.mov) |
File Formats to Avoid
Below is a table of file formats to avoid as they are either: 1) propritary; 2) defunct; or 3) difficult to preserve or resuse.
| File Types | File Formats | Reasoning |
|---|---|---|
|
Audio |
Real Audio (.ra, .rm, .ram) Windows Media Audio (.wma) |
Proprietary and defunct |
| Statistics Packages | JMP files | Proprietary |
| Adobe Creative Suite | .psd; .eps, .indd, etc. | Proprietary |
| Older Microsoft Office Suite | .doc, .docx, excl | Proprietary and defunct. |
| Images | JPEG 2000 (.jp2) | Defunct |
| Video | Windows Media Video (.wmv) | Proprietary and defunct |
| Generic | .dat | DAT files are usually structured and should be saved in a file format that makes the structure explicit (such as .csv or .tsv). |
| Databases | Microsoft Access (.accdb); FileMaker Pro (.fm5, .fm7, .fm12, etc.) | Proprietary |
