Font converter — TTF, OTF, WOFF and WOFF2

WOFF2 alone. It is supported by every browser released since 2016, is 30–50% smaller than WOFF and around 60% smaller than the raw TTF. Adding WOFF as a second source is harmless but almost never needed, and EOT and SVG fonts are dead formats — the browsers that required them no longer exist.

Not on its own. A format conversion re-wraps the same tables, so the layout data arrives unchanged — and the round trip is verified table by table in the test suite. What does remove features is subsetting, because a feature whose glyphs are gone has nothing left to do. That is why every dropped feature is listed with its reason instead of disappearing quietly.

Because a font carries three separate ascent/descent pairs and the platforms disagree about which to read: macOS uses hhea, Windows uses OS/2 usWin unless the USE_TYPO_METRICS flag is set, and Android follows the flag too. If those numbers disagree inside the font, no CSS can make the platforms match. The inspector shows all three line-heights, and the repair sets them equal and turns the flag on.

It pins every axis at the values you picked and produces an ordinary static font — smaller, and usable in software that does not support variable fonts. Note that pinning only some axes is not the same thing: the font stays variable in the remaining ones, which is sometimes what you want.

For a webfont, usually yes — it can cut the file dramatically. Hinting is TrueType bytecode that nudges outlines onto the pixel grid, and it only has an effect on Windows without ClearType; macOS, iOS and Android ignore it. Keep it if your audience is Windows-heavy and the font is used at small sizes.

The tool reads the font's fsType flag and shows what it declares — installable, editable, preview and print, or restricted. Treat that as a signal, not permission: browsers ignore fsType entirely, and the licence you bought the font under is what actually governs webfont use. Many desktop licences do not include it, and many foundries sell a separate webfont licence.

Not by redrawing outlines, and it will not pretend otherwise. OTF usually holds PostScript (CFF) curves while TTF holds TrueType curves; converting between them means re-fitting every outline, which changes the shapes. What this tool does is re-wrap the font honestly and tell you what is inside — if you ask for TTF and the outlines are CFF, you get a valid OpenType file and a note saying so.

WOFF2 compression is Brotli at its highest setting over a transformed glyph stream, and it is genuinely expensive — measured here at roughly 120–155 KB of source per second. A typical webfont takes well under a second; a 1 MB desktop font with full Cyrillic, Greek and Arabic coverage takes seven to nine. Trimming to the languages you need usually removes both the wait and most of the file.