OTF to WOFF2 Converter
FileFlip converts OTF to WOFF2 entirely inside your browser, using the font engine compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an OTF file to WOFF2?#
- Drop your OTF file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to WOFF2 and the conversion starts on its own. FileFlip downloads 0.7 MB of WebAssembly the first time and nothing after that, then runs the font engine on your own machine.
- Save the WOFF2 file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting OTF to WOFF2 lose quality?#
No. The glyph outlines are converted between outline models rather than redrawn, so the letterforms in the WOFF2 file are the ones in the OTF file. What can change is the hinting and the OpenType tables around them.
Is it safe to convert OTF files online?#
Yes, because nothing is uploaded. FileFlip converts OTF files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What OTF to WOFF2 actually does to the file#
Converting OTF to WOFF2 runs on the font engine, downloads 0.7 MB of WebAssembly the first time and nothing after that, converts the glyph outlines between outline models, keeps hinting and kerning, and drops OpenType features.
| Engine | the font engine |
|---|---|
| Conversion path | One step: OTF → WOFF2 |
| Downloaded to your browser | 0.7 MB, once, then cached by your browser |
| Quality | Outlines preserved |
| You get back | One file |
| Where it runs | On the page's own thread, so a very large file will make the tab wait |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Hinting | Kept | Carried through into the converted file. |
| Kerning | Kept | Carried through into the converted file. |
| OpenType features | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- this conversion runs on the page's own thread, so a large file will freeze the tab while it works
What is an OTF file?#
An OTF file stores a font's glyph outlines as PostScript-style cubic Bezier curves, along with the OpenType layout tables that drive ligatures and other typographic substitutions.
Use OTF for a font that relies on OpenType features like ligatures or stylistic alternates, which professional design and publishing software reads natively.
Convert OTF to WOFF2 before using it on a website, since browsers need a compressed web font format and OTF isn't one.
What is a WOFF2 file?#
A WOFF2 file wraps a TrueType or OpenType font in a Brotli-compressed container built for @font-face delivery on the web, replacing WOFF's older zlib compression.
Serve WOFF2 as the primary font format for any website, since it's the smallest option every current browser supports.
Convert away from WOFF2 only when a font needs to be installed on a desktop or opened by a font editor, since WOFF2 exists purely for web delivery.
OTF to WOFF2 questions people ask#
Can OTF fonts be converted back from other formats?
Not with every tool. Some font converters, including this one, can read an OTF file and write it out as TTF, WOFF or WOFF2, but can't write a new OTF file, because reconstructing CFF cubic outlines from a different source isn't supported by every font engine. Turning a WOFF or TTF file into a genuine OTF usually needs a dedicated font editor instead.
Does converting OTF to another format change its license?
No, and it doesn't grant new permissions either. A font's license governs how it can be used and distributed regardless of which container format it's stored in, so a font licensed for desktop use only doesn't become licensed for web embedding just because it was converted to WOFF2.
What's the difference between OTF and TTF?
OTF adds an option for PostScript-style cubic Bezier outlines and OpenType's layout tables, like ligatures and language-specific substitutions, on top of the same font structure TTF uses. A TTF file can't hold those layout features; an OTF file can, whether its outlines are cubic or the same quadratic type TTF uses.
How much smaller is WOFF2 than WOFF?
WOFF2 typically comes in around 30 percent smaller than the same font packaged as WOFF, because it replaces WOFF's zlib compression with Brotli and adds a font-specific preprocessing step before compressing. The exact saving varies by font, but it's consistent enough that WOFF2 is the default choice for new @font-face declarations.