Free OTF Converter: No Sign-up, Files Never Uploaded
Change the format of OTF files for free, with no sign-up and no upload. The conversion happens in this tab, so your files never leave your computer or phone.
OpenType (OTF) in short. OpenType with PostScript outlines, from Adobe and Microsoft. Supports advanced typography such as ligatures and alternates.
From OTF you can convert to TTF, WOFF, WOFF2 and EOT. Some of these pairs can need a one-time engine download, which the page announces before it starts.
- 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.
- Choose the format you want from the list of targets that fit your file.
- Open the options if you want to change quality or size, 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 files and can also write them.
- 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.
- 4 target formats to choose from.
- A one-time engine download is cached by your browser.
Supported formats
| Format | Read | Write | Notes |
|---|---|---|---|
| TrueType (TTF).ttf | Yes | Yes | TrueType: the font format Apple and Microsoft developed jointly in the late 1980s. |
| 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. |
| WOFF2.woff2 | Yes | Yes | The second Web Open Font Format, compressed with Brotli. |
| EOT.eot | Yes | Yes | Embedded OpenType: a web font format used only by Internet Explorer. |
About the formats
About OTF
OpenType with PostScript outlines, from Adobe and Microsoft.
Supports advanced typography such as ligatures and alternates.
It does not support transparency.
What OTF can become
OTF to TTF runs in the page.
OTF to WOFF runs in the page.
OTF to WOFF2 can need a one-time download of about 0.3 MB.
OTF to EOT runs in the page.
Converting to OTF
Pages for converting to OTF start from TTF.
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.
- Some conversions use a WebAssembly engine that your browser downloads once, the first time you need it. Only the engine is fetched, never your file, and the page shows the approximate size before it starts. Your browser caches it, so later conversions skip the download.
- 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. Some conversions load a small conversion engine the first time you use them. That download is the only network traffic, it contains no file of yours, and your browser keeps it for next time.
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 can I convert OTF files to?
You can convert OTF to TTF, WOFF, WOFF2 and EOT. Pick one on the converter and it applies to every file you add.
Can I convert other files to OTF?
Yes. TTF can be converted to OTF.
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.