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遅延損害金計算機(商事・民事法定利率対応)

遅延損害金計算機(商事・民事法定利率対応)

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Weekly Schedule Generator

Create beautiful stream schedules for VTubers.

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calculate

Unit Converter

Convert data storage units (GB/MB/KB).

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Password Generator

Generate secure passwords locally.

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edit_note

Case Converter

Convert text case (upper, lower, etc).

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Duplicate Remover

Remove duplicate lines and sort.

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Text Cleaner

Remove extra spaces and empty lines.

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terminal

Base64 Converter

Encode/Decode Base64.

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Lorem Ipsum Generator

Generate dummy text.

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terminal

JSON Formatter

Format and validate JSON.

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terminal

UUID Generator

Generate random UUIDs.

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terminal

URL Encoder

Encode/Decode URLs.

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terminal

HTML Entity Encoder

Escape special characters.

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Date Difference

Calculate days between dates.

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Age Calculator

Calculate age from birthdate.

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Percentage Calculator

Calculate percentages.

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BMI Calculator

Calculate Body Mass Index.

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Unix Timestamp

Convert Epoch/Date.

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QR Code Generator

Create QR codes.

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Color Converter

HEX, RGB, HSL converter.

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Stopwatch

Stopwatch with laps.

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Dog Age Calculator

Convert dog years to human years.

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Cat Age Calculator

Convert cat years to human years.

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Japanese Era Converter

Convert Western years to Japanese Eras.

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Discount Calculator

Calculate sale price and savings.

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Aspect Ratio Calculator

Calculate dimensions based on ratio.

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psychology

AI Prompt Builder

Build structured prompts for ChatGPT, Claude, and Image AI.

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Pomodoro Timer

Focus timer for productivity.

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Text Diff Checker

Compare two texts side-by-side to highlight additions, deletions, and changes instantly.

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Base64 Image Viewer

Instantly decode Base64 strings to images or convert images to Base64 code.

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chair

Bill Splitter & Settlement

Calculate fair splits with weighted ratios and optimize 'who owes whom' settlements.

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Box Breathing Guide

Calm your mind and improve focus with animated breathing exercises used by Navy SEALs.

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Box Shadow Generator

Create beautiful layered CSS box shadows with real-time preview and multi-layer support.

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headphones

BPM Tapper

Measure song tempo (BPM) by tapping your keyboard or screen in rhythm.

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terminal

chmod Calculator

Visually set Linux file permissions and generate chmod commands in octal or symbolic format.

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Contrast Ratio Checker

Check color contrast ratio against WCAG guidelines for web accessibility.

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DnD Dice Roller

A polyhedral dice roller for TRPGs like D&D. Supports d4 to d20 with custom modifiers and history.

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terminal

Dummy Data Generator

Generate realistic mock data (JSON, CSV, SQL) for development and testing.

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lock

File Hash Calculator

Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes locally. Verify file integrity with chunked processing for large files.

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psychology

AI Token Estimator

Quickly estimate token counts for GPT-4 and other LLMs. No API required.

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chair

Gym Interval Timer

A customizable interval timer for HIIT, Tabata, and circuit training with visual and audio cues.

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.htpasswd Generator

Securely generate .htpasswd entries for Basic Authentication using Bcrypt, MD5, or SHA-1.

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Daily Hydration Calculator

Calculate your ideal daily water intake based on weight, activity, and climate with a visual goal tracker.

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calculate

Investment Simulator

Calculate compound interest growth with monthly contributions and tax considerations.

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terminal

IP Subnet Calculator

Calculate network address, broadcast, and host range with visual CIDR and binary breakdown.

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terminal

JSON to CSV Converter

Quickly convert JSON data to CSV format with nested object flattening and real-time validation.

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JWT Payload Viewer

Instantly decode and view the contents of JSON Web Tokens (JWT) without verification.

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Kaomoji Picker

Browse and copy Japanese emoticons (kaomoji) by category. One-click copy with history and search.

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Keyboard Ghosting & NKRO Tester

Check your keyboard for ghosting and N-key rollover with this real-time visualizer.

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Loan & Mortgage Simulator

Calculate monthly repayments, total interest, and see an amortization schedule for your home or car loan.

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Global Meeting Planner

Find the perfect meeting time across multiple time zones with visual business hour overlaps.

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headphones

Metronome

An accurate, high-precision metronome with adjustable BPM, time signatures, and subdivisions.

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Morse Code Translator

Translate text to Morse code and back. Features real-time conversion, sound (beep), and screen flash signals.

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Image Palette Extractor

Extract beautiful color palettes from any image instantly. Get HEX, RGB, and HSL codes for your design projects.

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Pixel Art Editor

A simple online tool to create retro pixel art, manage frames, and export as PNG or Sprite Sheets.

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PPI Calculator

Calculate Pixels Per Inch (PPI) and dot pitch to check display sharpness.

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terminal

Regex Explainer & Tester

Visualize and test regular expressions in real-time with step-by-step explanations.

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Roman Numeral Converter

Easily convert between Arabic numbers and Roman numerals with step-by-step explanations.

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Speech Time Estimator

Calculate reading time for your script based on word and character count. Perfect for presentations.

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SQL Formatter

Prettify messy SQL queries with proper indentation and dialect support.

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SVG Optimizer

Optimize and shrink SVG files by removing metadata and unnecessary code.

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SVG Placeholder Generator

Create customizable SVG placeholder images for web development and design mockups.

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TDEE & Macro Calculator

Calculate your Total Daily Energy Expenditure (TDEE) and optimal PFC balance for your fitness goals.

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headphones

Online Tone Generator

Generate pure tones, sweep frequencies, and test your audio equipment with various waveforms.

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terminal

User-Agent Analyzer

Instantly parse and analyze User-Agent strings to identify Browser, OS, and Device details.

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VAT/Sales Tax Calculator

Calculate tax-inclusive and exclusive prices with invoice-ready rounding options.

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headphones

White Noise Player

Boost focus and sleep with White, Pink, and Brown noise. Features a sleep timer and smooth fade-out.

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Aim Trainer

Boost your clicking accuracy and reaction time with this customizable mini-game.

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Fancy Border Radius Generator

Create organic, blob-like shapes using 8-point CSS border-radius. Preview and copy CSS code instantly.

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Bra Size Calculator

Calculate your bra size (JP/US/UK) based on underbust and topbust measurements with sister size advice.

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terminal

CHMOD Symbolic Converter

Instantly convert between CHMOD numeric (755) and symbolic (rwxr-xr-x) permissions.

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Click Speed Test (CPS)

Test your clicking speed in 1, 5, 10, or 60 seconds. See your CPS, rank, and click distribution graph.

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Color Blindness Simulator

Simulate how images appear to people with different types of color vision deficiencies.

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Cookie Parser

Parse, decode, and edit browser cookie strings into a readable table or JSON format.

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CSV to JSON Converter

Easily convert CSV data to JSON format with type inference and header detection.

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Cursive Text Generator

Instantly convert standard English text into elegant cursive (mathematical script) Unicode characters.

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Decision Wheel

A customizable roulette wheel to help you make decisions quickly. Add options, set weights, and spin!

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Bubble Level & Compass

Check tilt angles and cardinal directions using your smartphone's built-in sensors.

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Multi-Discount & Tax Calculator

Calculate final prices with multiple discounts (e.g., 20% + 10% off) including sales tax.

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Pregnancy Due Date Calculator

Calculate your estimated due date, current week, and fetal size based on your last period.

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Electricity Cost Calculator

Calculate the electricity cost of household appliances based on power consumption and usage time.

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Emoji Converter (Emojify)

Turn your text into fun messages with emojis! Replace words or append icons instantly.

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Fuel Cost Calculator

Calculate trip fuel costs, split expenses with passengers, and compare car efficiency.

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terminal

Git Command Generator

Select what you want to do and generate the perfect Git command instantly.

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Glitch Image Generator

Create aesthetic glitch art with RGB shift, noise, and slicing effects.

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Image Histogram Analyzer

Analyze image exposure, color distribution, and clipping with real-time gamma correction.

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terminal

JSON Diff Checker

Compare two JSON objects and visualize differences (additions, deletions, and changes) in a tree view.

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JWT Debug Generator

Generate dummy JWTs for development and debugging with custom payloads and secret keys.

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Keyboard Event Viewer

Check JavaScript keyboard event properties (key, code, which) in real-time.

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Markdown Previewer

A real-time Markdown editor with GitHub-style preview and HTML export.

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1RM Calculator & Plate Loader

Calculate your one-rep max (1RM) and see a visual guide for loading plates.

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Ovulation Calculator

Predict your most fertile days and ovulation date with a printable calendar.

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terminal

Port Checker & Dictionary

A quick reference and search tool for common network port numbers and services.

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Random Number Picker

Pick one or multiple random numbers from a custom range with animation.

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Reaction Time Test

Measure your reflexes in milliseconds. Test your response speed for gaming or daily alertness.

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English Readability Checker

Analyze English text readability using Flesch-Kincaid and Gunning Fog scores with word highlighting.

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Ring Size Converter & Ruler

Convert ring sizes across JP, US, UK, and EU standards. Includes an on-screen ruler with calibration for accurate measurement.

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ROT13 & Caesar Cipher Tool

Encrypt and decrypt text by shifting letters. Supports ROT1 to ROT25.

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Screen & Window Info

Check screen resolution, window size, and device pixel ratio in real-time.

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Sleep Cycle Calculator

Calculate the best time to wake up or go to bed based on 90-minute sleep cycles.

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Stereo Tester

Check your speaker or headphone balance, phase, and frequency response instantly.

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Tip Calculator

Calculate tip and split the bill easily with rounding options.

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Vibration Tester

Test your smartphone's vibration motor and create custom patterns.

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Visual Countdown Timer

A visual timer that shows remaining time with a shrinking pie chart and changing colors.

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World Clock & Time Zone Converter

Check current times worldwide and simulate time differences with a slider. Perfect for global meetings and travel planning.

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terminal

YAML ↔ JSON Converter

A real-time, bidirectional YAML and JSON converter with syntax validation and formatting.

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terminal

ASCII Table & Search

Quickly lookup ASCII codes (Decimal, Hex, HTML Entities) and control characters with real-time filtering.

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Aspect Ratio Calculator Pro

Calculate aspect ratios, pixel dimensions, and screen sizes from diagonal inches. Supports GCD simplification and common resolution presets.

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terminal

Base64 File Converter

Convert any file (images, PDFs, fonts) to Base64 strings and back to files instantly in your browser.

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Binary Text Converter

Convert text to binary/hex and back with a matrix-style animation.

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Visual BMI Calculator

Calculate BMI with a visual silhouette that changes as you adjust height and weight sliders.

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Mindful Breathing Circle

A simple tool to help you relax and focus using rhythmic breathing animations.

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CHMOD Permission Calculator

Visually calculate Unix/Linux file permissions with prose explanations and security warnings.

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Color Mixer

Blend two colors and generate a smooth gradient palette with custom ratios and steps.

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CSS Triangle Generator

A GUI tool to generate CSS triangle code using the border property hack.

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Business Date Calculator

Calculate working days excluding weekends and holidays.

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EXIF Viewer & Eraser

Extract camera metadata (EXIF) from images and download a clean version without private info like GPS.

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Factorial, Permutation & Combination Calculator

Instantly calculate n!, nPr, and nCr with step-by-step expansion and support for large numbers.

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GCD & LCM Calculator

Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) for multiple numbers with step-by-step explanations.

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HTTP Status Code Checker

Quickly lookup HTTP status codes, their meanings, causes, and solutions.

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Japanese Era Converter

Convert Western years to Japanese eras (Reiwa, Heisei, etc.), calculate age (Full/Traditional), and generate a school history timeline.

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Keyboard Cleaner & Lock

Safely clean your keyboard by temporarily disabling all keys. Features ripple effects and cat detection.

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Kinetic Typography Generator

Animate text with Bounce, Shake, or Glitch effects and export HTML/CSS.

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List Randomizer

Shuffle any list and split into groups instantly.

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Meta Tag & OGP Analyzer

Analyze OGP, Twitter Cards, and SEO meta tags by simply entering a URL.

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headphones

Visual Metronome

A soundless metronome that uses light and movement to guide your rhythm.

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OGP Image Simulator

Preview how your OGP images appear on X (Twitter), Facebook, LinkedIn, and Discord.

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Password Strength Checker

Check the security of your password instantly and get tips to improve it.

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Percentage Change & Discount Calculator

Calculate percentage change, growth rate, and discounts with simple sentence-based results.

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PFC Balance Calculator

Calculate your ideal protein, fat, and carbohydrate intake in grams based on your daily calorie goal.

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Pomodoro Focus Tracker

A productivity timer that tracks focus sessions, task names, and total work time.

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Prime Number Checker

Check if a number is prime, perform prime factorization, and find nearest primes.

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Scientific Notation Converter

Quickly convert between decimal numbers and scientific (E) notation with significant figure control.

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Subnet Mask Cheat Sheet & Calculator

A handy reference for CIDR, subnet masks, and host counts, featuring a real-time subnet calculator.

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Text Case Randomizer

Convert text to Random Case, Alternating Case, and Mocking Spongebob meme style.

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Text Encryption Tool

Encrypt and decrypt text using AES with a password. Secure, browser-based, and no data is sent to the server.

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Text Repeater

Instantly repeat any text for test data or design mockups.

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Time Duration Calculator

Calculate duration between two times or add multiple time durations easily.

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Unicode Escape Converter

Convert text to Unicode escape sequences (JS, CSS, HTML) and back instantly.

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Unit Price Calculator

Compare prices of multiple products by weight or volume to find the best deal.

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Word Frequency Counter

Analyze text to count word occurrences and visualize them in a tag cloud.

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YouTube Thumbnail Preview

Preview your YouTube thumbnails in real layouts (Home, Sidebar, Mobile) to optimize CTR.

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A11y Contrast Checker

Check text contrast ratios against WCAG AA and AAA standards for web accessibility.

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Reverse Text Generator

Instantly flip your text backwards. Perfect for social media, riddles, or checking palindromes.

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Syllable Counter

Count the number of syllables in your English text instantly for poetry, lyrics, and speechwriting.

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Text Art Generator

Transform your text into stylish art with shadows and gradients for web and design.

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English Text Inflector

Automatically convert English words between plural, singular, and past tense forms using linguistic rules.

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Text Shortener

Extracts key sentences to summarize long texts quickly.

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Keyword Extractor & Summarizer

Quickly extract key terms and generate a logic-based summary from any text.

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Voice to Text Converter

Transcribe your voice into text in real-time. Perfect for notes, meeting minutes, and hands-free drafting.

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Academic Paper Title Generator

Generate professional, catchy academic paper titles from your research keywords instantly.

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Email Subject Line Analyzer

Analyze your email subject lines to improve open rates with sentiment and keyword insights.

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Legal Jargon Simplifier

Converts complex legal terms into plain, everyday language to help you understand contracts and documents.

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Presentation Script Summarizer

Condense your presentation scripts into key points and highlight essential keywords instantly.

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Product Description Generator

Create compelling product copy and SEO-friendly descriptions instantly.

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Resume Keyword Extractor

Extract and compare keywords from your resume and job descriptions to optimize for ATS.

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Social Media Bio Generator

Generate attractive SNS bios from keywords to increase followers.

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Text Tone Analyzer

Analyze the sentiment, formality, and humor of your text to ensure perfect communication.

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URL Slug Generator

Convert titles and text into SEO-friendly URL slugs. Supports Romanization and stop-word removal.

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Character-Level Diff Checker

Compare two texts character by character to find exact differences and changes.

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Reverse BMI Calculator

Calculate target weight from your desired BMI. Supports Metric and Imperial units.

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Benham's Disk Simulator

A scientific optical illusion top that creates colors from black and white.

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E-commerce White Background Validator

A browser-based e-commerce white background validator tool. No data sent to server.

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Plywood Cut Plan Visualizer

A browser-based plywood cut plan visualizer tool. No data sent to server.

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Video Subtitle CPS Checker

A browser-based video subtitle cps checker tool. No data sent to server.

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terminal

SSH ProxyJump Config Generator

A browser-based ssh proxyjump config generator tool. No data sent to server.