A curated shelf of free online tools—not a 100+ dump. No signup. Runs in your browser.
精选免费在线小工具（不是堆砌目录），无需注册，本地处理。
Recent guides: Free AI writing & prompt tools · YouTube thumbnail & lettering · all guides
Estimate tokens for common AI models.
Count words, characters, and reading time.
Format and validate JSON instantly.
Generate UUIDs in one click.
Compare cloud GPU spot prices.
Tip, discount & Black Friday deal math.
lower, UPPER, Title, snake_case, camelCase.
Unix epoch ↔ local / UTC datetime.
Placeholder paragraphs for templates.
How-tos and free tool roundups.
推荐工具（含联盟链接；购买可能产生佣金）
Some links are affiliate links; we may earn a commission at no extra cost to you.