File format hubs
What each file format actually is, and every conversion into and out of it.
A format hub collects everything on this site that reads or writes one file format: what the format is, every conversion available in both directions, and the tools that work with it. Formats are listed here once there is something accurate to say about them.
Formats
- TTF converterTrueType fonts store glyph outlines as quadratic curves in the sfnt container shared with OpenType.
- OTF converterOTF files hold cubic PostScript outlines in a CFF table, inside the same sfnt container TrueType uses.
- WOFF converterWOFF wraps an existing sfnt font for web delivery, compressing each table separately with zlib.
- WOFF2 converterWOFF2 packages a font with Brotli compression and a reversible transform of the glyf, loca and hmtx tables.
- PNG converterPNG is a lossless raster format with full alpha transparency, standardised by the W3C and ISO.
- JPG converterJPEG is a lossy raster format built for photographs, with no transparency and quality that degrades on every save.
- PDF converterPDF fixes the layout of a page, which is why converting out of one is always a reconstruction.
- CSV converterCSV is plain text with one record per line, carrying no types, no formulas and no encoding declaration.
- JSON converterJSON is a text data format with six value types, no comments, no trailing commas and no date type.