🛠️ Utilify
用於日常任務的免費線上工具。無需安裝，瀏覽器直接使用。
可用工具
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圖片浮水印
給圖片添加自定義浮水印。
單位轉換器
轉換長度, 重量, 溫度, 體積等。
圖片格式轉換器
免費線上將圖片轉換為 JPG, PNG, WebP 格式。
BMI 計算器
計算身體質量指數 (BMI)。
日期計算器
計算 D-Day 和日期差異。
文本工具箱
統計單詞，字符，刪除重複項，轉換大小寫等。
JSON 格式化
格式化，檢查，和壓縮 JSON 數據。開發者零廣告。
顏色格式轉換
轉換 HEX, RGB, HSL, CMYK 顏色格式。
計時器 / 番茄鐘
線上計時器和番茄工作法。
Base64 編碼/解碼
將文本編碼或解碼為 Base64。
QR 碼生成器
將文本或 URL 轉換為 QR 碼。
正則表達式測試
實時測試正則表達式。
SQL 格式化
格式化，美化和壓縮 SQL 查詢。開發者零廣告。
Lorem Ipsum 生成器
生成 Lorem Ipsum 佔位符文本。
Favicon 生成器
將圖片轉換為 Favicon 圖標。
文本差異比對
線上比較兩個文本文件的差異。高亮顯示變化。
強密碼生成器
生成強大且安全的密碼。密碼在本地生成，絕不發送到服務器。
YouTube 縮圖下載
提取並下載高質量 (4K, HD) YouTube 視頻縮圖。
Markdown 編輯器 & 預覽
實時 Markdown 預覽工具。輕鬆編寫 Markdown 並立即查看轉換後的 HTML。
反應速度測試
測試您的反應速度。屏幕變綠時儘快點擊！
JWT Decoder
Paste a JWT to decode its header and payload. Tokens are processed locally and never sent to a server.
Hash Generator
Type any text to instantly compute MD5 and SHA-1/256/384/512 digests. Nothing is uploaded — all hashing runs locally.
Unix Timestamp Converter
Convert between Unix timestamps and dates. Auto-detects seconds vs. milliseconds and shows both UTC and your local time zone.
UUID Generator
Generate cryptographically random UUIDs locally. v4 (random) is the most common choice; v1 embeds a timestamp. Format options for hyphens, casing, and braces.
URL Encoder / Decoder
Encode characters into percent-encoded form (e.g. space → %20) or decode them back. Use 'Component' for query values; use 'Full URL' to preserve reserved characters like : / ?.
AI Token Counter & Cost Calculator
Estimate the token count of any text and the per-model API cost across GPT-4o, Claude Opus 4.7, Gemini 2.5, and more. Heuristic count (≈4 chars/token English, ≈1.5 chars/token CJK) — exact tokenization needs the provider API.
MCP Server Config Generator
Generate Model Context Protocol (MCP) server configuration for Claude Desktop, Cursor, or VS Code. Pick transport, command, args, and env vars — the tool emits the correct JSON shape for each client and shows the config file path.
AI Image Metadata Inspector
Drop or pick an image to inspect its embedded metadata. The tool reads PNG tEXt/iTXt chunks (Stable Diffusion stores prompts there), JPEG EXIF UserComment (Midjourney/DALL-E often embed details), and detects C2PA Content Credentials boxes. Files never leave your browser.
ChatGPT → Blog Post Converter
Paste a ChatGPT (or Claude) conversation — text or exported JSON — and the tool splits it into user/assistant turns, optionally strips your prompts, and formats the assistant responses as clean Markdown ready for your blog.
Prompt PII Scrubber
Mask sensitive data (emails, phones, SSNs, credit cards, API keys, IPs, URLs) before pasting prompts into ChatGPT, Claude, or any AI service. Runs entirely in your browser — your text never leaves the page.
Claude.md Generator
Generate a CLAUDE.md (or any AI agent system prompt) from a simple form. Specify the project role, coding conventions, constraints, and commands; copy or download the resulting Markdown.
Loan Calculator
Enter the loan amount, annual interest rate, and term in years to see your monthly payment, total interest paid, and a 12-month amortization preview. Standard formula for fixed-rate loans — mortgages, auto, personal.
Compound Interest Calculator
Enter your starting principal, annual return, time horizon, compounding frequency, and optional monthly contributions to project the future value of an investment or savings account. Includes a year-by-year balance breakdown.
Retirement Calculator
Enter your current age, target retirement age, current savings, monthly contributions, expected return, planned annual withdrawal, and life expectancy. The calculator runs an accumulation phase, then a withdrawal phase to show whether your nest egg lasts.
Calorie & BMR Calculator
Enter your age, sex, height, weight, and activity level to get your basal metabolic rate, total daily calorie burn, and recommended targets for weight loss, maintenance, or muscle gain. Uses the Mifflin-St Jeor equation, the most accurate formula for healthy adults.
Pregnancy Due Date Calculator
Enter the first day of your last menstrual period (LMP) and your typical cycle length. The calculator returns the estimated due date, your current pregnancy week and day, the trimester, and how many days remain until delivery. Naegele's rule plus a cycle-length adjustment.
Body Fat Percentage Calculator
Enter your height and circumference measurements (neck, waist, and hip for women) to estimate body fat percentage with the US Navy method. The result includes a fitness-category label and the typical recommended range for your sex.
RAG Text Chunker
Paste a long document and split it into overlapping chunks for embedding-based retrieval. Pick chunks-by-characters for predictable size or chunks-by-token-estimate for closer alignment with embedding model limits. All processing happens in your browser.
Few-Shot Prompt Formatter
Add a system instruction and a list of input → output examples. The tool emits a clean few-shot prompt in Markdown, Anthropic-style XML tags, OpenAI messages JSON, or plain text — ready to paste into ChatGPT, Claude, or a script.
JSON Schema Validator
Paste your JSON data and a JSON Schema. The validator checks type, required, properties, items, enum, format, pattern, and min/max constraints, and reports each failure with the JSONPath where it occurred. All processing in your browser.
Tip Calculator
Enter the bill, pick a tip percentage (or type a custom one), and the calculator splits the total across however many people are paying. Quick buttons for 10/15/18/20/25%. Runs entirely in your browser.
Percentage Calculator
Three common percentage operations in one place: what is X% of Y, X is what percent of Y, and percent change from X to Y. Switch modes from the dropdown — the input labels update so you don't have to remember the formula.
Discount Calculator
Enter an original price and a discount percent — the calculator returns the final price and the dollar (or won) amount you save. Optional second discount for stacked sales (e.g., "30% off, then extra 20% at checkout").
Sleep Cycle Calculator
Plan your sleep around 90-minute REM cycles. Enter a wake time to see when to fall asleep for 4–6 cycles, or enter a bedtime to see good wake times. The calculator adds 14 minutes for falling asleep so the suggested times match real-world sleep onset.
Reading Time Estimator
Paste text or enter a word count to estimate how long it'll take to read at your chosen speed. Default 250 WPM is a typical adult silent-reading pace; pick 150 for spoken/podcast pacing or 300+ for skimming.
Water Intake Calculator
Estimate daily water intake from body weight, with bumps for exercise and hot climates. The result is shown in milliliters, liters, and 250 ml glasses. Baseline is 33 ml per kg of body weight — typical for moderately active adults.
File Size Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Pick decimal (1 KB = 1000 B — what hard drives advertise) or binary (1 KiB = 1024 B — what your OS shows).
Age Calculator
Pick a birth date and get exact age — years, months, and days — plus total days alive and how many days until the next birthday. Handy for visa forms, school cutoffs, and "how old will I be in 2030" curiosity.
圖片編輯器
裁剪、旋轉圖片並應用濾鏡。
DB 轉 JPA 轉換器
將 SQL 模式轉換為 JPA 實體和 DTO 類。
JSON 轉 TS/DTO
將 JSON 轉換為 TypeScript 介面和 NestJS DTO。
Excel 轉 SQL
將 Excel 數據轉換為 SQL INSERT 查詢。
JSON 轉 Excel
將 JSON 數據轉換為 Excel 並下載。（安全）
SEO JSON-LD 生成器
生成用於 Google/Naver 曝光的結構化數據（Schema）。
PDF 合併/拆分
在瀏覽器中安全地合併和拆分 PDF，無需上傳到伺服器。
文本轉圖表
從文本創建流程圖和時序圖。