What is a .OTF file?
OTF is the OpenType font format, a richer successor to TrueType.
- Did you know
- OpenType was created jointly by Microsoft and Adobe in 1996.
- On the web a .OTF file is served with the MIME type
font/otf. - Analyser spots a .OTF file by its signature bytes
4F 54 54 4F- ASCII for "OTTO".
- What Analyser reads
- Preview fonts and read their metadata: TrueType (TTF), OpenType (OTF), web fonts (WOFF, WOFF2), and collections (TTC), with variable-axis animation.
- Depth of analysis
- .OTF is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .OTF file
- Drag a .OTF file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- .TTF · .WOFF · .WOFF2 · .TTC. See all supported file types.