What happens when you convert WOFF to OTF
- The WOFF's tables are decompressed and reassembled into a standard font file, exactly as it was before it was packed for the web.
- If the WOFF holds TrueType outlines rather than PostScript ones, the result is still a valid OpenType font; OpenType allows both kinds of outline.
How to convert WOFF to OTF online
- Press "Choose WOFF files" and select one or more files, or drag them onto the box. You can add files of any size your device can hold in memory.
- There are no settings to choose: the converter keeps everything the target format can hold.
- Press "Convert to OTF". Fonts convert instantly; nothing extra needs to download.
- Save each OTF with its download button. Close the tab and every trace of the files is gone from memory.
Why convert WOFF to OTF?
WOFF files usually come from fonts served by websites. People convert them to OTF because an OTF can be installed on Windows, Mac and Linux and used in design software.
In short, WOFF is good at what it was made for, and OTF is the more practical choice when the file has to open, upload or print somewhere else. WOFF loads in every browser through CSS; cannot be installed on a computer, while OTF installs on Windows, Mac and Linux; browsers load it through CSS.
How to convert WOFF to OTF on Windows, Mac, iPhone and Android
On Windows
Open this page in Chrome, Edge or Firefox, drag your WOFF files in from File Explorer, and press Convert. Each OTF is saved to your Downloads folder.
On a Mac
Safari, Chrome and Firefox all work. Drag the WOFF files from Finder onto the drop zone and the OTF files land in Downloads.
On iPhone and iPad
Open the page in Safari and tap Choose WOFF files. You can pick from Photos or from the Files app. The converted OTF appears in Files, in the Downloads folder.
On Android
Open the page in Chrome, tap Choose WOFF files and pick them from Files or your gallery. The OTF is saved to the Download folder, where any file manager can find it.
Best settings for WOFF to OTF
Font conversion has no quality settings, because nothing is re-drawn: the same glyph tables are packed or unpacked.
After converting, double-click the font file to install it. If it came from a website, check that its licence allows desktop use.
WOFF vs OTF: the differences
| WOFF | OTF | |
|---|---|---|
| Full name | Web Open Font Format | OpenType font |
| Type | font | font |
| Created by | the World Wide Web Consortium | Microsoft and Adobe |
| First released | 2009 | 1996 |
| Compression | Lossless | Lossless |
| What it holds | the tables of a TrueType or OpenType font, each compressed | glyph outlines, usually cubic PostScript curves, plus typographic features |
| In a browser | loads in every browser through CSS; cannot be installed on a computer | installs on Windows, Mac and Linux; browsers load it through CSS |
| Common uses | fonts served by websites | professional typography, ligatures and design work |
| MIME type | font/woff | font/otf |
About WOFF and OTF files
What is a WOFF file?
WOFF is a TrueType or OpenType font with each table compressed and a small header added, which makes web fonts smaller to download. The font inside is unchanged.
What is an OTF file?
OpenType extends TrueType with advanced typography such as ligatures and alternate glyphs. An .otf file usually holds PostScript-style cubic outlines rather than TrueType curves.
WOFF to OTF not working? Common problems
- The font will not install. WOFF files cannot be installed; convert them to TTF or OTF first.
- The web font does not show. Check the path in your @font-face rule and that the server sends font files, which some hosts block by default.
- The converter says the file is not a font. Only single fonts are supported; font collections (.ttc) and WOFF2 files are not.
Convert WOFF to OTF from the command line
The fontTools library for Python converts between font and web font formats:
python3 -c "from fontTools.ttLib import TTFont; f = TTFont('input.woff'); f.flavor = None; f.save('output.otf')"The converter on this page does the same job in your browser, without installing anything.
WOFF to OTF converter FAQ
Will I lose quality converting WOFF to OTF?
No. The font data is compressed or decompressed losslessly; every glyph is identical.
Why is the OTF a different size from the WOFF?
The font is decompressed, so it is larger than the WOFF it came from.
Are my WOFF files uploaded anywhere?
No. The conversion runs inside this browser tab using code on this page that repacks the font tables, so your files stay on your device. You can disconnect from the internet after the page has loaded and it still works.
Can I convert several WOFF files to OTF at once?
Yes. Select or drop as many files as you like; they are converted one after another and each gets its own download button.
How do I open an OTF file?
OTF installs on Windows, Mac and Linux; browsers load it through CSS. OTF is common for professional typography, ligatures and design work.
Is this WOFF to OTF converter free?
Yes. There is no sign-up, no watermark and no limit on how many files you convert. The site is paid for by advertising, and because conversions run on your device there is no server cost per file.
Can I convert WOFF to OTF on my phone?
Yes. The converter works in Safari on iPhone and iPad and in Chrome on Android. Converted files are saved to the Downloads folder.