OTC is the CFF-flavored OpenType collection — the same ttcf container carrying PostScript-outline members instead of TrueType ones.
Typical use: Extract a member font from an OTC collection exactly like TTC.
About the OTC format
TTC は複数のフォントを 1 ファイルにまとめた形式です。同じ書体の太さ違いなどをまとめて管理できます。
個別に使うには TTF/OTF への分割が必要です。配布をまとめたい場合に向きます。
Strengths
- ✓ 複数書体をまとめられる
- ✓ 容量を節約できる
- ✓ First member extracts to a clean TTF
Limitations
- ✗ 個別利用には分割が必要
- ✗ 対応ソフトが限られる
- ✗ Members share glyphs — editing one is tricky
- Structure
- ttcf header + member offset table + sfnt members
- Types / schema
- Binary container of sfnt fonts
- Compatibility
- Windows, macOS, fonttools
- Best for
- CJK system font distribution
Convert OTC to…
3 direct directions plus 3 workflows, sorted A–Z; 🔥 marks popular targets.
Cross-engine workflows
Frequently asked questions
What is a OTC file?
OTC is the CFF-flavored OpenType collection — the same ttcf container carrying PostScript-outline members instead of TrueType ones.
How do I convert OTC files online?
Pick a target format from the "Convert OTC to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert OTC files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can OTC convert to?
This page lists all 6 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.