Tac One
Tac One is a sans serif font in 1 weight. Its lowercase letters are 17% narrower than the typical sans serif font. Last updated 30 May 2025.
Editing a PDF that uses Tac One
Most PDFs embed only the letters they already use. Type a new letter and many editors either refuse or swap in a different font. MythosPDF recognises Tac One from the widths stored in your PDF, loads the complete open font, and sets your new text in Tac One itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 432.2 units per 1000 em |
|---|---|
| Average capital letter width | 478.4 units per 1000 em |
| Word space | 120 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 34% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Sans serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Tac One
Measured on every printable character both fonts contain. A smaller difference means the same words take the same space, so lines break in the same places.
- Cuprum Regularloosely similar widths (34.3 units)
- Saira Condensed Regularloosely similar widths (35.6 units)
- Fira Sans Extra Condensed Regularloosely similar widths (37.2 units)
- Ubuntu Condensed Regularloosely similar widths (40.4 units)
- Akshar Regularloosely similar widths (41.7 units)
- PT Sans Narrow Regularloosely similar widths (41.9 units)
- Passion One Regularloosely similar widths (41.9 units)
- Jockey One Regularloosely similar widths (42.4 units)
Compare Tac One
Questions people ask
+Can I edit a PDF that uses Tac One?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Tac One itself, loaded from the open font, so the edit matches the rest of the page.
+Is Tac One free to use?
Tac One is released under the SIL Open Font License 1.1, an open licence that allows free use in documents, including commercial ones. Check the licence text for your exact use.
+Which font is closest to Tac One?
By measured letter widths, Cuprum is the closest match among open fonts (a mean difference of 34.3 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Tac One support?
It includes these character sets: Latin, Central European, Math symbols, Symbols, Vietnamese.
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