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Drop one TTF or two hundred. Batch conversion is not a paid feature here.
Convert TTF to OTF
A design workflow or a foundry pipeline standardises on OTF with CFF outlines.
SafeConvert engineFreeNo sign-upBatch supported
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What actually changes
TTF and OTF are not the same picture in two wrappers.
Quadratic TrueType curves are converted to cubic Bezier curves and stored in a CFF table. The glyph data usually gets slightly smaller, since cubic curves describe the same shapes with fewer points.
Worth knowing first
TrueType hinting does not carry across. Those instructions are written for the quadratic rasteriser and have no CFF equivalent, so a font that was carefully hinted for small sizes on Windows loses that tuning and renders slightly differently in low-resolution text.
Questions
TTF to OTF, answered
Is OTF better than TTF?
Neither is better. They are two outline formats inside the same OpenType wrapper, with different curve mathematics and hinting models.
Will my file get smaller?
The glyph outlines usually do. Whether the whole file shrinks depends on what else the font carries.
How to convert TTF to OTF
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Choose your settings
OpenType Font is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.