格式转换
转换计量单位，例如长度、重量、温度、体积、面积、速度、能量、数据大小等。
›Are these conversions accurate?
Yes. Every unit conversion uses double-precision floating-point math (15+ significant digits) with the official conversion factors.
›Do I need to install anything?
No — every converter runs entirely in your browser. There's no signup, no download, no upload.
›Can I share a specific conversion?
Yes. The URL updates with your input value and units, so you can bookmark or share any result directly.
计算工具
金融、日期和时间、健康与健身、烹饪和排版——日常计算器。
›Are my financial or health data sent anywhere?
No. The calculators run locally; only the live exchange-rate endpoint is contacted, and only for public market data.
›Where do currency rates come from?
Live mid-market rates from the European Central Bank, refreshed multiple times per hour.
›Can I bookmark a specific calculation?
Yes — the inputs are encoded in the URL so you can share or save any scenario.
格式化与代码
格式化、压缩和转换 JSON, XML, YAML, CSV, SQL, regex——以及代码生成器、schema、框架、DevOps 和测试工具。
›Is my data sent to a server?
No. JSON, CSV, YAML, XML, regex and code-gen tools all run entirely in your browser — your data never leaves your device.
›How big a payload can I paste?
Anything your browser can hold in memory — typically several megabytes. Very large files are best processed locally with a script.
›Which languages can I generate types for?
TypeScript, C#, Java, Python, Go, Rust, Swift, Kotlin, Dart, Scala, Elixir, Haskell, C++ and PHP — from JSON or JSON Schema input.
编码与加密
Base64、URL、Hex、哈希、HMAC、JWT、密钥和经典密码——所有操作都在客户端进行，绝不记录。
›Which hash and signature algorithms are supported?
SHA-1/256/384/512, HMAC, RSA, ECDSA, Ed25519 and PGP via the browser's Web Crypto API and OpenPGP.js. MD5 is intentionally omitted for security use.
›Can I decode a JWT or X.509 cert safely here?
Yes. JWT, X.509 and PGP tools all run locally — tokens, certs and keys are parsed in your browser and never sent over the network.
›Is Base64 Unicode-safe?
Yes — input is normalised to UTF-8 before encoding so accented characters, emoji and CJK round-trip correctly.
生成工具
UUID、密码、二维码、Lorem Ipsum、模拟数据和随机选择器——内置加密随机性。
›Are passwords I generate ever logged?
Never. Passwords are produced by crypto.getRandomValues in your browser and are not transmitted anywhere. The password vault is encrypted client-side too.
›How random are the UUIDs and tokens?
All identifiers use the Web Crypto API's CSPRNG — the same source browsers use for TLS — so they're cryptographically suitable for tokens and keys.
›Can I generate codes in bulk?
Yes — UUIDs, passwords and QR codes all support batch generation with one click, downloadable as text or zip.
文件与媒体
图像、音频、视频、PDF、电子书和文件实用工具——都在您的浏览器中运行。
›Are my files uploaded anywhere?
No. Image, audio, video, PDF and spreadsheet tools all process your files locally in your browser. Nothing is uploaded, stored or logged.
›What image formats can I convert between?
PNG, JPG, WebP, AVIF, HEIC, JFIF and SVG — plus resize, crop, rotate, compress, strip EXIF metadata and run a full image editor.
›How are audio and video processed?
All edits run client-side via FFmpeg-wasm or the browser's native Audio/Video APIs. Files stay on your device.
颜色和设计
颜色、调色板、对比度、渐变和CSS单位。
›Which color formats are supported?
HEX, RGB, HSL, OKLCH (perceptually uniform) and named CSS colors — convert between any of them in either direction, plus pick from images.
›Can I check WCAG accessibility contrast?
Yes. The contrast checker reports the ratio plus pass/fail for AA and AAA at both regular and large text sizes, and the color-blindness simulator previews common conditions.
›Do the CSS generators output Tailwind?
Where it applies, yes — the Tailwind colour finder maps any HEX/RGB to the closest Tailwind class.
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