Free online TTF to WOFF converter

A website may require a webfont instead of the TTF supplied with a desktop typeface package. Converting it produces a WOFF file that can be referenced by CSS and distributed with web pages.

What the ttf format is

TrueType Font (TTF) is an sfnt-based font format containing glyph outlines, character mappings, metrics, naming information, and optional hinting instructions. Operating systems install TTF files for desktop applications, while font editors such as FontForge, Glyphs, FontLab, and RoboFont create or export them. TTF files commonly appear in downloaded typeface packages, design projects, document templates, and font libraries.

A TTF can contain TrueType outlines; some OpenType fonts also use the same .ttf extension when their outlines are quadratic rather than PostScript/CFF outlines. Its table-based structure allows the font data to be placed in a WOFF container without redrawing the glyphs.

What the woff format is

Web Open Font Format (WOFF) is a webfont container intended for HTTP delivery and CSS @font-face rules. WOFF 1.0 stores TrueType- or OpenType-compatible font tables with per-table zlib compression, usually making the resource smaller than the corresponding uncompressed TTF. It can also contain optional metadata and private data; these do not change the glyph outlines.

WOFF is suitable when a browser-based project needs to load a font or when the receiving system specifically accepts WOFF. It is a delivery format, not a preferred editable source: retain the original TTF or font-project files for future design changes.

How to convert ttf to woff

For a one-off conversion, use the built-in converter on 101convert.com: select the TTF file, choose WOFF as the output format, start the conversion, and download the generated file. No software installation is required.

For local, repeatable conversions, FontTools provides a scriptable method:

1. Install Python 3 if it is not already installed.
2. Install FontTools with python -m pip install fonttools. On systems where Python 3 is invoked as python3, use python3 -m pip install fonttools.
3. Save this script as ttf_to_woff.py:

from fontTools.ttLib import TTFont

font = TTFont("input.ttf")
font.flavor = "woff"
font.save("output.woff")

4. Replace input.ttf with the source filename and run python ttf_to_woff.py from that folder. The script writes output.woff.
5. Inspect the generated file with a font editor or validator, then test it in the target browser with a rule such as src: url("font.woff") format("woff").

FontForge provides a graphical alternative. Open the TTF, choose File → Generate Fonts, select the WOFF or Web Open Font Format output type, set the destination filename, and generate the font. Menu labels can differ between FontForge versions.

Quality and compatibility limits

Standard conversion preserves the outlines and normally preserves the font's metrics, mappings, and naming tables, but it does not improve hinting, repair malformed data, or remove licensing restrictions. A license that permits local installation may still prohibit web embedding or redistribution; check the typeface license before publishing the WOFF.

WOFF is supported by current browsers. WOFF2 generally gives better compression, so a modern website can generate both formats and list WOFF2 first with WOFF as a fallback:

@font-face {
  font-family: "Example";
  src: url("example.woff2") format("woff2"),
       url("example.woff") format("woff");
}

Keep WOFF when older browser support or a WOFF-only platform is required. Test glyph coverage, language mappings, variable-font behavior, and rendering in the intended browsers; conversion cannot fix missing Unicode mappings, invalid tables, incorrect names, or a font that was already malformed.