简单好用的免费工具。
快速、简单的实用工具,用于转换、计算、格式化、生成和创建 — 直接在您的浏览器中运行。无需注册。无需上传。无需跟踪。
设计上保护隐私
文件和文本在您的浏览器中处理,永远不上传。关闭网络,每个工具依然可以正常工作。
快速且免费
无需注册,无付费墙,无需等待。工具通过全球网络即时加载。
简单
每个工具专注做好一件事。没有杂乱、没有暗黑模式、没有模态弹窗陷阱。您来了,使用,离开。
热门工具
Uttir 上最常用的工具。点击任意一个即可立即打开。
JSON Formatter
Format, beautify, and validate JSON with adjustable indentation — instantly in your browser.
Developer Tools
UUID Generator
Generate cryptographically random UUID v4 identifiers, one or a thousand at a time.
Developer Tools
Base64 Encoder
Encode any text — including emoji and non-Latin scripts — into standard Base64.
Developer Tools
JWT Decoder
Decode a JWT’s header and payload and check its expiration — without sending it anywhere.
Developer Tools
JWT Sign (HS256 / RS256)
Sign a JSON Web Token with HS256 (HMAC shared secret) or RS256 (RSA private key). Output is a standard compact JWT (header.payload.signature).
Security Tools
HMAC Generator
Compute a Hash-based Message Authentication Code (HMAC) for any message and shared secret. Supports SHA-256, SHA-512, SHA-1, and MD5. All computation runs in your browser.
Security Tools
Regex Tester
Test and debug regular expressions with live matches, capture groups, and highlighted results.
Developer Tools
Word Counter
Count words, characters, sentences, and paragraphs in your text instantly.
Text Tools
Percentage Calculator
Three percentage tools in one: percent of a value, ratio as a percent, and percent change.
Calculators
最新工具
最近添加Internet Speed Test
Measure your download speed, latency, and jitter in the browser. Download-only: nothing is uploaded and nothing is tracked.
Network Tools
NewNetwork Latency Test
Ping several well-known endpoints from your browser and compare round-trip times to work out whether a slowdown is you or them.
Network Tools
NewClick Speed Test
Measure your clicks per second (CPS) over 1, 5, 10, or 30 seconds. Works with touch too, and keeps your personal best on this device.
Web Tools
按分类浏览
222 个工具分布在 19 个分类中。选择一个分类以查看其中的所有内容。
来自博客
What Is My IP Address — And What Does It Reveal About Me?
Your IP address is a public identifier that any website you visit can see. Learn what it exposes (city, ISP, ASN, sometimes a VPN), what it does not expose, and how to check yours without uploading anything.
2026年8月31日 · 7 分钟阅读
How to Create an XML Sitemap (and Why You Need One)
A sitemap.xml file tells search engines which pages on your site exist. Learn what to include, what to leave out, how to write one by hand or generate one, and how to submit it to Google and Bing.
2026年8月31日 · 7 分钟阅读
How to Test Color Contrast for Accessibility (WCAG 2.2 Explained)
Color contrast is the most-measured accessibility metric on the web. This guide explains the WCAG 2.2 contrast formula, the AA and AAA thresholds, and how to make sure your site is usable for people with low vision.
2026年8月31日 · 6 分钟阅读
常见问题
New tools and guides, once a week
One short email when something new ships. No tracking, no images, unsubscribe with one click.