fmtlib / fmt

git clone https://github.com/fmtlib/fmt.git 12.2.0 · 4mo ago 🔥 on GitHub Trending today

A C++ formatting library offering a fast, type-safe alternative to printf, iostreams, and to_string, and the basis of C++20 std::format.

Why you might care

Use it when you need safe, fast string formatting in C++ with a Python-like format syntax and compile-time format string checks. It is header-only capable, has no external dependencies, is MIT licensed, and implements C++20 std::format and C++23 std::print.

Alternatives

std::formatprintfiostreamsBoost.Format

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Star history (as recorded here)

2026-10-20 · 25,884 ★ 2026-11-07 · 25,912 ★

LanguageC++

LicenseMIT

Created2012-12-07 (13y ago)

Last pushtoday

Watchers322

OwnerOrganization

Seen on GitHub Trending

2026-11-07 — #8 daily in c++ · +2 ★

GitHub topics

c-plus-plus chrono cpp cross-platform floating-point formatting multiplatform output performance printf ranges unicode

README

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