WOFF Converter
FileFlip converts WOFF files into 4 other formats entirely inside your browser, using the font engine compiled to WebAssembly. The WOFF file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a WOFF file?#
- Drop your WOFF file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert WOFF files online?#
Yes, because nothing is uploaded. FileFlip converts WOFF 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 happens to a WOFF file#
FileFlip converts WOFF into 4 formats with the font engine, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Fonts |
|---|---|
| File extension | .woff |
| FileFlip support | Read and written |
| Conversions available | 4 |
| Engines | the font engine |
| Downloaded to your browser | 0.7 MB on the first conversion, then cached |
What is a WOFF file?#
A WOFF file wraps a TrueType or OpenType font in a compressed container built specifically for loading with @font-face on the web.
Serve WOFF when a site's browser support has to reach back further than WOFF2 covers, or as the fallback source in a @font-face src list.
Convert WOFF to WOFF2 as the primary web font and keep WOFF only as a fallback, since WOFF2 is smaller for the same font on every modern browser.
The WOFF file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
WOFF questions people ask#
Why is WOFF smaller than a plain TTF file?
WOFF wraps the same TrueType or OpenType glyph data inside a zlib-compressed container, which typically shrinks the file by more than 40 percent. Decompression happens once when the browser loads the font, so the smaller download comes at essentially no runtime cost.
Should I use WOFF or WOFF2 on my website?
WOFF2 compresses better than WOFF because it uses Brotli instead of zlib, and every browser still receiving updates supports it, so WOFF2 should be the primary format in a @font-face declaration. WOFF is worth keeping only as a fallback source for the handful of older browsers that never picked up WOFF2.
Can I install a WOFF file as a font on my computer?
Not directly. WOFF is a delivery format for the web, and operating systems expect an installable font like TTF or OTF rather than a WOFF container, so a WOFF file needs converting to TTF or OTF before Font Book or Windows Font Viewer will install it.