--- title: "OTF to WOFF Converter — Free, Private, Local | Compress Pro" description: "Convert OTF to WOFF in your browser — a lossless zlib wrapper for older browsers. Your font file never leaves your device. Free, private, no sign-up." canonical: https://compress-pro.com/otf-to-woff --- # Convert OTF to WOFF. > OTF wrapped as WOFF for legacy browsers — all in-browser. WOFF wraps your OTF in zlib compression, table by table, byte for byte — **the PostScript outlines are untouched**. Prefer WOFF2 for modern sites; WOFF exists for the long tail of old browsers. **No uploads · No ads · Free & open source.** ## How it works 1. Drop TTF, OTF, WOFF, WOFF2 or EOT files anywhere on the page — or click to browse. 2. Pick the output format — the font tables are repackaged losslessly, never re-drawn. 3. Convert, then download each font on its own or the whole batch as a ZIP. ## Check whether you need it at all Be honest about the audience before shipping a second font file: WOFF only pays off for browsers that predate 2016. If your visitors are on anything current, [OTF to WOFF2](https://compress-pro.com/otf-to-woff2) alone covers them at about three-quarters of the size. Where WOFF still earns its bytes is the stubborn long tail — enterprise desktops pinned to IE11, kiosk and point-of-sale webviews frozen years ago, intranets nobody dares to upgrade. ## PostScript curves in a zlib envelope An OTF stores letterforms as CFF charstrings — compact cubic Bézier programs inherited from PostScript. WOFF wraps that table (and every other one) in zlib compression without parsing it, so the envelope neither knows nor cares what outline flavor it carries. Decompression is exact by definition, which is why kerning, ligatures and hinting come out precisely as they went in — verifiable by round-tripping through [WOFF to OTF](https://compress-pro.com/woff-to-otf). ## Frequently asked questions ### When is WOFF the right choice over WOFF2? Only when you must serve genuinely old browsers — IE9–11 or Android 4-era stock browsers. Everything newer prefers WOFF2, which is also about a quarter smaller. ### Is the conversion lossless? Bit-for-bit: each table is stored zlib-compressed and unwraps to exactly the original bytes. Outlines, kerning, OpenType features and hinting all survive untouched. ### Am I allowed to convert this font? Converting a font never changes its license. Many desktop licenses do not cover web embedding (and vice versa), so check yours before publishing a converted font. Fonts under the OFL or Apache licenses and fonts you made yourself are fine. Your file also never leaves your device — nothing is uploaded anywhere. ### Is it private? Yes. The font is repackaged entirely in your browser — it is never uploaded, and the server does nothing but deliver this page. For licensed fonts that matters twice over: nothing is redistributed to any third party, and no copy lingers on a server afterwards. Want proof? Run one file through, switch your connection off, and run another — it still works. ## Related tools - [Convert OTF to WOFF2](https://compress-pro.com/otf-to-woff2) - [Convert fonts](https://compress-pro.com/font-converter) - [Convert WOFF to OTF](https://compress-pro.com/woff-to-otf) --- Part of [Compress Pro](https://compress-pro.com/) — every tool page has a markdown twin at `.md`. Full tool index: [llms.txt](https://compress-pro.com/llms.txt)