Free OTF to WOFF Converter: No Sign-up, Files Never Uploaded
This free OTF to WOFF converter runs entirely on your device. You do not need an account or a login, and your files are never uploaded, so they never leave your browser.
The glyph outlines and tables inside the font are read and repackaged as WOFF.
This pair runs on code that is already in the page, so there is no extra engine to download.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Add your OTF files by dragging them onto the converter or by using the file picker.
- Check that WOFF is the selected target format; it is already chosen on this page.
- Open the options if you want to change the settings shown for the target, or keep the defaults.
- Press Convert and watch the progress shown for each file.
- Download each result, or take them all together as one ZIP when you converted several files.
Features
- Reads .otf and writes .woff.
- Free, with no watermark added to the result.
- No sign-up and no login.
- Your files are never uploaded and never leave your device.
- Batch conversion with a ZIP download for several results.
- The input is recognised by its content, not only by its file name.
Supported formats
| Format | Read | Write | Notes |
|---|---|---|---|
| OpenType (OTF).otf | Yes | Yes | OpenType with PostScript outlines, from Adobe and Microsoft. |
| WOFF.woff | Yes | Yes | Web Open Font Format: a compressed font for websites. |
About the formats
About OTF
OpenType with PostScript outlines, from Adobe and Microsoft.
Supports advanced typography such as ligatures and alternates.
About WOFF
Web Open Font Format: a compressed font for websites.
Supported by every modern browser.
OTF vs WOFF
OTF does not support transparency, and WOFF does not.
OpenType (OTF) files use the .otf extension and WOFF files use .woff, so the converted file gets a new name with the new extension.
Privacy: how it works
- Your OTF files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
Tips
- Check the licence of a font before you convert or host it; conversion does not change what you may do with it.
- Use WOFF2 for the web when you can, since it is the smallest.
- Keep the original font file as the master.
- Test the converted font in a real page before you ship it.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your OTF files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow, and a very big batch may need to be split into smaller runs.
What is the difference between OTF and WOFF?
OTF does not support transparency, and WOFF does not. OpenType (OTF) files use the .otf extension and WOFF files use .woff, so the converted file gets a new name with the new extension.
Can I convert many OTF files at once?
Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.
Will anything be lost when I convert OTF to WOFF?
The converter keeps the content of the file. Check the result once, since small differences in metadata or colour handling can happen between formats.
Can I convert WOFF back to OTF?
Yes. Open the WOFF to OTF page and use the same steps. Converting back does not undo any loss from the first conversion.