TTF to OTF Converter
Convert TrueType (.ttf) fonts to OpenType/PostScript (.otf) with a real outline conversion, not a rename.
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About Converting TTF to OTF
Most tools that claim to convert TTF to OTF simply rename the file, and it is worth understanding why that is not a conversion. Both formats are SFNT containers, but they store glyph shapes in fundamentally different ways: TrueType draws with quadratic B-splines in a table called glyf, while OpenType/PostScript draws with cubic Bezier curves in a table called CFF. A renamed .ttf still contains quadratic outlines in a glyf table, and it still carries the TrueType sfnt version tag — which is exactly how a rasteriser tells the two apart. This converter does the real work: it redraws every glyph as cubic curves, builds a proper CFF table, and sets the sfnt tag to OTTO so the font genuinely is what its extension claims.
Refitting curves is an approximation, so it is fair to ask how faithful it is. The error is bounded to a single font design unit, and fonts are drawn on a 1000 or 2048 unit em — roughly a fiftieth of a pixel at normal reading sizes, well below what the rasteriser itself rounds away. Glyph count, character mapping and, importantly, every advance width are preserved exactly, so text set in the converted font occupies precisely the same space as before and no layout shifts.
Common use cases
- Meeting a foundry, printer or client specification that asks specifically for OTF
- Standardising a mixed font library on one flavour before archiving or distribution
- Preparing a font for a design workflow or embedder that expects PostScript outlines
- Producing a genuine OTF where a renamed file has already been rejected as invalid
- Checking whether a font’s outlines survive a flavour change before committing to it
Tips for best results
- Hinting does not transfer. TrueType hinting is bytecode in the fpgm, prep and cvt tables; CFF hinting is a different mechanism entirely. The converted font relies on the rasteriser’s own hinting, which is what most modern systems use anyway.
- Advance widths come across exactly, so line breaks and text metrics do not move. This is the check that matters most if the font is already in use somewhere.
- Outline conversion is capped at 10,000 glyphs. Full CJK and whole-Unicode fonts exceed that; converting to WOFF or WOFF2 instead leaves the outlines untouched and has no limit.
- Bitmap and colour-emoji fonts cannot be reflavoured at all — their artwork lives in CBDT/CBLC tables rather than as outlines, so there is nothing to redraw. The converter says so rather than producing an empty font.
How to Convert TTF to OTF Online
Here is how a TTF → OTF conversion works on PrivConvert, from start to finish. What you gain with OTF: advanced typography features.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from TTF to OTF starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
What makes this TTF-to-OTF converter different
Privacy here is not a checkbox. Every TTF-to-OTF conversion is engineered so your data never lingers, leaks or gets reused.
Your files are handled entirely by automated code. No staff, partner or AI model ever reads, stores or trains on your data.
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your file cannot be intercepted on the way to the server or back to you.
Convert instantly with no sign-up, no email and no profiling cookies. We never build a profile around you or the files you convert.
TTF vs OTF - Format Comparison
| Feature | TTF | OTF |
|---|---|---|
| File extension | .ttf | .otf |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
Why people pick PrivConvert for OTF
Thousands of people trust PrivConvert with their files because privacy here is structural — enforced by how the service runs, not just promised.