๐ ๏ธ Utilify
Privacy-first online tools โ runs entirely in your browser. JSON ยท JWT ยท Base64 ยท UUID ยท 110+ unit converters. No signup, no upload.
All Tools
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Image Watermark
Add watermarks to your images.
Unit Converter
Convert Length, Weight, Temperature, Volume, and more.
Image Converter
Resize images and convert to WebP, JPEG, PNG formats.
BMI Calculator
Calculate your Body Mass Index (BMI).
Date Calculator
Calculate D-Day and date differences.
Text Utilities
Count words, characters, remove duplicates, convert case, and more.
JSON Formatter
Format, validate, and minify JSON data. Ad-free for developers.
Color Converter
Convert between HEX, RGB, HSL color formats.
Timer / Pomodoro
Online Timer and Pomodoro technique.
Base64 Encoder/Decoder
Encode or decode text to Base64.
QR Code Generator
Convert text or URL to QR code.
Regex Tester
Test regular expressions in real-time.
SQL Formatter
Format, Beautify and Minify SQL queries. Ad-free for developers.
Lorem Ipsum Generator
Generate Lorem Ipsum dummy text.
Favicon Generator
Convert images to favicons of various sizes.
Text Diff Checker
Compare two texts difference easily. Highlights added and removed parts.
Strong Password Generator
Generate strong and secure passwords. Passwords are generated locally and never sent to a server.
YouTube Thumbnail Downloader
Extract and download YouTube video thumbnails in high quality (4K, HD). Free and easy tool.
Markdown Editor & Preview
Real-time Markdown preview tool. Write Markdown effortlessly and see converted HTML instantly.
Reaction Speed Test
Test your reaction time. Click as fast as you can when the screen turns green!
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 โ 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 โ %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 (โ4 chars/token English, โ1.5 chars/token CJK) โ 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 โ 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 โ Blog Post Converter
Paste a ChatGPT (or Claude) conversation โ text or exported JSON โ 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 โ 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 โ 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 โ output examples. The tool emits a clean few-shot prompt in Markdown, Anthropic-style XML tags, OpenAI messages JSON, or plain text โ 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 โ the input labels update so you don't have to remember the formula.
Discount Calculator
Enter an original price and a discount percent โ 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 4โ6 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 โ typical for moderately active adults.
File Size Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Pick decimal (1 KB = 1000 B โ what hard drives advertise) or binary (1 KiB = 1024 B โ what your OS shows).
Age Calculator
Pick a birth date and get exact age โ years, months, and days โ 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.
Image Editor
Crop, rotate, and apply filters to images.
DB to JPA Converter
Convert SQL schema to JPA Entity and DTO classes.
JSON to TS/DTO
Convert JSON to TypeScript Interface and NestJS DTO.
Excel to SQL
Convert Excel data to SQL INSERT queries.
JSON to Excel Converter
Convert JSON data to Excel and download. (Secure)
SEO JSON-LD Generator
Create structured data (schema) for Google/Naver exposure.
PDF Merge/Split
Merge and split PDFs securely in your browser without server upload.
Text to Diagram
Create flowcharts and sequence diagrams from text.