一个标签页，收纳你全部的开发者工具。24 个单文件、零依赖、本地优先的开源工具，下载即用。

离线 REST 客户端：请求构建、查询参数 / 头 / Body、Bearer/Basic 鉴权、响应计时与历史记录。

Offline emoji lookup - 120+ common emojis with keyword or group search, click to copy with Unicode codepoint.

Offline math evaluator — safe (no eval) tokenizer + shunting-yard + RPN, with functions & constants. Single-file, zero-dependency, local-first.

Offline password generator with entropy audit. Single-file, zero-dependency, local-first.

Offline temperature converter — Celsius / Fahrenheit / Kelvin / Rankine, four-scale real-time conversion. Single-file, zero-dependency, local-first.

Email syntax validation, parsing and role detection. Single-file, zero-dependency, offline-first.

Offline HTML entity encode/decode (named/decimal/hex) with XSS-safe escaping. Single-file, zero-dependency, local-first.

TotpForge - single-file zero-dependency offline tool (nano-tools)

Offline JWT and token decoder. Split header payload signature, humanize exp nbf iat. No signature verification, no network, zero dependencies.

Local-first accessibility toolkit. WCAG contrast check, compliant color picker, color-blindness simulation, HTML/ARIA audit. Zero upload, offline. Part of the nano-tools matrix.

线性图标工作台：17 款描边图标、可调描边色/粗细/尺寸/填充，一键复制或下载 SVG。

Number to English words and Chinese capital RMB amount converter. Single-file, zero-dependency, offline-first.

JSON 工作台：格式化 / 压缩 / 校验、转 TypeScript 类型、JSONPath 查询、树形浏览。

DiffForge - single-file zero-dependency offline tool (nano-tools)

19 合 1 离线开发者工具箱：JSON/YAML、Base64、哈希、时间戳、正则、颜色等一站搞定。

CSS 游乐场：渐变、box-shadow、cubic-bezier 缓动曲线、Flex 布局，实时预览可复制。

Rate-limit simulator: token bucket and leaky bucket with pure refill/consume maths. Single-file, zero-dep, local-first.

Offline pixel art and sprite editor in a single HTML file. Frames, onion skin, animation preview, PNG/spritesheet export. Zero dependencies.

nano-tools · 24 个单文件、零依赖、本地优先的开源开发者工具，下载即用，数据永不离机。