在浏览器里运行的开发者实用工具

输入内容留在你的设备上。选择下方工具；每个工具有固定链接（例如 /zh/json/）。打开首页（/）时，我们会按浏览器语言跳转到支持的语言；语言菜单会在此设备上记住你的选择。

为快速任务而设计

隐私优先

这些工具以客户端 JavaScript 在您的标签页中运行。

按分类浏览

跳转到主题或打开完整分类页面。

Explore by topic

Jump between related calculators — great for work, money, PDFs, and everyday math.

探索分类

精选快捷入口，每个主题都有独立页面。

全部工具

Age Calculator locally in your tab — quick and privacy-friendly.

Simple fields for adults, children, and appetite — instant estimates for meat, linguiça-style sausage, charcoal, ice, and soft drinks. Runs only in your browser.

Business Days locally in your tab — quick and privacy-friendly.

Case Converter locally in your tab — quick and privacy-friendly.

Character Counter locally in your tab — quick and privacy-friendly.

Type both salaries to see the equivalent monthly value of CLT (after benefits accrual) and the PJ amount after a flat Simples tax.

Combine a starting balance with regular monthly deposits and an annual rate to see total interest, contributions, and final balance.

Csv To Json locally in your tab — quick and privacy-friendly.

Csv Tsv Converter locally in your tab — quick and privacy-friendly.

Date Difference locally in your tab — quick and privacy-friendly.

Dedupe Lines locally in your tab — quick and privacy-friendly.

Type the original price and the discount percent to see the final price and savings, or compare two prices to learn the implied discount percent.

Scan pasted text for email-shaped tokens, drop duplicates, optionally sort, and join with newline, comma, tab, pipe, or a custom delimiter — all in your browser.

Apply the classic 70% rule: if the ethanol price is below 70% of the gasoline price it is usually a better buy.

Favicon Generator locally in your tab — quick and privacy-friendly.

Hash Generator locally in your tab — quick and privacy-friendly.

Image Compress locally in your tab — quick and privacy-friendly.

Image Convert locally in your tab — quick and privacy-friendly.

Image Crop locally in your tab — quick and privacy-friendly.

Image Resize locally in your tab — quick and privacy-friendly.

Stack photos or scans into one A4-sized PDF — order images with the arrow buttons, then download. Processing stays on your device.

Enter the financed amount, monthly interest rate and number of installments to read the fixed monthly payment, total paid, and total interest.

Json To Csv locally in your tab — quick and privacy-friendly.

Jwt Decoder locally in your tab — quick and privacy-friendly.

Meta Preview locally in your tab — quick and privacy-friendly.

Name Picker locally in your tab — quick and privacy-friendly.

Type the gross salary and number of night hours worked between 22h and 5h to read the equivalent hours and total bonus.

Enter adults, children, hours, and whether you are serving snacks only or a meal — get starter numbers for cake, salgadinhos, and drinks.

Pdf Compress locally in your tab — quick and privacy-friendly.

Pdf Delete Pages locally in your tab — quick and privacy-friendly.

Pdf Extract Pages locally in your tab — quick and privacy-friendly.

Pdf Merge locally in your tab — quick and privacy-friendly.

Pdf Page Count locally in your tab — quick and privacy-friendly.

Pdf Reorder locally in your tab — quick and privacy-friendly.

Pdf Rotate locally in your tab — quick and privacy-friendly.

Pdf Split locally in your tab — quick and privacy-friendly.

Open a PDF and download each page as a high-resolution PNG — powered by pdf.js in your tab, not a remote converter.

Pdf Watermark locally in your tab — quick and privacy-friendly.

Three percent helpers in one screen: percent of a value, ratio between two numbers, and percent change between before and after.

Pizza Calculator locally in your tab — quick and privacy-friendly.

Qr Code locally in your tab — quick and privacy-friendly.

Regex Tester locally in your tab — quick and privacy-friendly.

Type A, B and C and read X for direct proportions — common for school, recipes, paint coverage, and unit pricing.

Focus the paste area and paste from the clipboard, or pick image files — build a one-page or multi-page PDF locally.

Slug Generator locally in your tab — quick and privacy-friendly.

Social Image Size locally in your tab — quick and privacy-friendly.

Sort Lines locally in your tab — quick and privacy-friendly.

Text Diff locally in your tab — quick and privacy-friendly.

Timezone Converter locally in your tab — quick and privacy-friendly.

Trim Spaces locally in your tab — quick and privacy-friendly.

Pick a dimension, choose source and target units, and read the converted value with no network round trip.

Url Encode locally in your tab — quick and privacy-friendly.

Url Extract locally in your tab — quick and privacy-friendly.

Utm Builder locally in your tab — quick and privacy-friendly.

Uuid Generator locally in your tab — quick and privacy-friendly.

Wheel Spinner locally in your tab — quick and privacy-friendly.

Word Counter locally in your tab — quick and privacy-friendly.

Yaml Json locally in your tab — quick and privacy-friendly.

Simulate months of compounding with separate monthly or annual rates for return, admin, and inflation — runs entirely in your browser.