How do I convert OTF to WOFF?

Add your OTF file to the upload area above, then press Convert. The WOFF file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to WOFF reduce quality?

No. WOFF is a lossless format, so the conversion preserves exactly what is in your OTF file. Note that it cannot recover detail that was already discarded when the OTF was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 40 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

FontLosslessRuns in your browser

OTF to WOFF Converter

Turn OTF files into WOFF in a couple of clicks. OpenType with advanced typographic features. Compressed font wrapper built for the web. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

OTF files (.otf) · up to 40.0 MB each

or paste files from your clipboard

Ready when you are

Drop a OTF file above and FileTools360 will turn it into WOFF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your OTF files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control the output settings.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

OTF and WOFF explained

OpenType extends TrueType with cubic curves and, more importantly, advanced typographic features: ligatures, small caps, stylistic alternates and proper multilingual shaping.

WOFF wraps a TrueType or OpenType font with compression and metadata, specifically for delivery over the web.

Where OTF files come from: Professional type foundries and design workflows.
Where WOFF is used: Web font services and site asset pipelines.

OTF vs WOFF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

OTF compared with WOFF
Property	Source	Target
Compression	None	Lossless
Introduced	1996	2009
Browser support	Every modern OS and design tool.	All browsers including old ones.

OTF is stronger at: Advanced typographic features. Better multilingual support. Cross-platform.
WOFF is stronger at: Compressed for the web. Supported by every browser including very old ones. Carries licensing metadata.

Why convert OTF to WOFF?

People make this switch when they run into the limits of OTF: web delivery. WOFF is the better fit when you must support browsers from before roughly 2016.

OTF limitations that prompt the switch: Uncompressed, so it is a poor web font. Advanced features need application support to be usable.
What you give up: Around 30% larger than WOFF2. Superseded for any modern browser target.

What is preserved when converting OTF to WOFF?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

About these formats

Source

OpenType Font

OpenType with advanced typographic features.

Extensions: .otf
MIME type: font/otf
Best for: Professional typography · Ligatures and alternates
Compatibility: Every modern OS and design tool.

Target

Web Open Font Format

Compressed font wrapper built for the web.

Extensions: .woff
MIME type: font/woff
Best for: Web fonts with legacy browser support
Compatibility: All browsers including old ones.

Glyph outlines and metadata are preserved. Converting a font does not grant you the right to redistribute or embed it — check the licence that came with the file.

Good to know