Heart is built to utilise the following file formats:
- Microsoft Office
- Open Office
- RTF
- TXT
- Microsoft Visio (.vdx)
- FrameMaker (.mif)
- InDesign (.inx & .idml)
- XML
- XLIFF
- XHTML
- HTML
- ASPX
- DITA
- SDF
- SVG
- iPhone apps (strings)
- Java properties files
- PO / POT
- YAML
- Trados TTX
- DocBook