TTF to OTF converter
Convert a TTF into an OTF right here on the page. OTF is the usual choice for professional typefaces with small caps, ligatures and alternate figures. Your file never leaves your computer.
Need the other direction? Convert OTF to TTF
How to convert TTF to OTF
- 1 Drop your TTF .ttf file onto the page, or click to browse for it.
- 2 Check the options. Nothing is thrown away on the way to OTF, so there is no quality dial to set.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the OTF, or add more files and do the whole set in one go.
Why convert TTF to OTF
- Rich layout tables enable real typographic features, not just glyphs.
- Compact, and closer to the way type designers draw the letters.
- Variable fonts that carry weight and width axes in one file.
- TTF: uncompressed, so files are several times the size of the same font as WOFF2.
TTF compared with OTF
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | TTF | OTF |
|---|---|---|
| File extension | .ttf | .otf |
| Colour depth | Quadratic outlines with TrueType hinting bytecode | CFF cubic or TrueType quadratic outlines, GSUB and GPOS layout tables |
| Size limits | 65535 glyphs per font | 65535 glyphs, up to 65535 Unicode planes via cmap format 12 |
| Introduced | 1991 | 1996 |
| Developed by | Apple and Microsoft | Microsoft and Adobe |
Quality and what changes
Both sides are lossless, so every pixel survives the trip intact and converting back returns the same image. What changes is the size and what the file can carry: OTF stores the data without compression, so expect a much larger file.
- One OTF limitation to keep in mind: also uncompressed, so it is a poor choice for delivery over the web.
Questions about TTF to OTF
Is my TTF file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your TTF is read straight from your own disk, converted on your machine and handed back as an OTF. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several TTF files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate OTF downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.