ブラウザーで使える便利なツール

Image Compressor

英語

Browser-based compressor for JPG, PNG and WebP, by quality or to a target file size

Image Resizer

英語

Browser-based image resizer with pixel, percent and long-edge modes and social platform presets

HEIC to JPG Converter

英語

Browser-based HEIC to JPG converter for iPhone photos, batch ZIP download, no upload

QR Code Generator

英語

Create URL, Wi-Fi and contact QR codes and download them as PNG or SVG

EXIF Remover

英語

Browser tool that shows a photo's EXIF and GPS data and strips it (losslessly unless the photo needs turning upright)

WebP to JPG Converter

英語

Browser-based WebP to JPG converter with background color for transparency and batch ZIP

Photo Date Stamp

英語

Browser tool that reads photo dates and stamps them onto a corner of each image

Image to Base64

英語

Browser converter between images and Base64, data URIs, CSS and HTML snippets

Merge PDF

英語

Browser-based PDF merger with previews and drag-to-reorder, no upload

Split PDF

英語

Split a PDF by page ranges, every N pages or per page, with ZIP download, in the browser

Organize PDF

英語

Reorder, rotate and delete PDF pages with thumbnails, in your browser

JPG to PDF

英語

Combine several images into one PDF with paper size, margin and orientation, in the browser

PDF to JPG

英語

Render PDF pages to JPG or PNG at a chosen DPI and download a ZIP, in the browser

Watermark PDF

英語

Add text or image watermarks to PDF pages with position, angle, opacity and tiling, in the browser

Add Page Numbers to PDF

英語

Add page numbers, header and footer text and Bates numbers to a PDF with position, style and first number

Crop PDF

英語

Crop PDF page margins manually or by detecting white space, applied as a CropBox in the browser

Wheel Spinner

英語

A picker wheel with weights, saved lists and share links

Team Generator

英語

A random team maker with keep-together and keep-apart rules

Raffle Picker

英語

A no-repeat raffle with a proof image carrying draw time and SHA-256 hashes

Seating Chart

英語

A random seating chart with locked seats, empty seats and print view

Dice Roller

英語

An online dice roller that understands 2d6+3 notation

Random Number Generator

英語

A crypto-grade random number generator with ranges, unique mode and decimals

Coin Flip

英語

A fair online coin flip with running heads, tails and streak statistics

Minesweeper

英語

Read the numbers and uncover every safe square in classic Minesweeper

FreeCell

英語

A classic solitaire game where a little empty space makes all the difference

Falling Blocks

英語

Stack colorful blocks and clear full rows before the board fills up

Sudoku Game

英語

Fill a 9×9 number puzzle with notes, hints and duplicate checks

Gomoku

英語

Connect five stones on a classic 15×15 board

2048 Game

英語

Slide matching tiles together and build your way to 2048

Memory Match

英語

Match colorful pairs in a little memory garden

Brick Breaker

英語

Clear every brick with three lives in a colorful arcade game

Online Timer

英語

A free countdown timer with fullscreen mode and a generated alarm sound

Online Stopwatch

英語

A free stopwatch with laps, splits and fullscreen mode

Pomodoro Timer

英語

A free Pomodoro timer that chains focus sessions and breaks

World Clock

英語

A world clock with time differences and a meeting time planner

Date Calculator

英語

Days between dates, a countdown timer and add/subtract days in one tool

Server Time Checker

英語

See a website's real server clock and how far off your own clock is

Duration Calculator

英語

Sum work or playback durations without wrapping at midnight

Age Calculator

英語

An age calculator with exact years, months, days and a birthday countdown

Loan Calculator

英語

Monthly payment, total interest and a full amortization schedule with CSV download

Savings Calculator

英語

Deposit and monthly savings interest, simple or compound, with optional tax

Margin Calculator

英語

Solve cost, price, margin and markup from any two, with fees, shipping and tax

BMI Calculator

英語

A BMI calculator with WHO categories and a healthy weight range

Unit Converter

英語

A two-way unit converter for seven categories, with exact definitions

Split Bill Calculator

英語

A multi-round bill splitter with exact rounding and settle-up transfers

Aspect Ratio Calculator

英語

Find a reduced ratio and proportional image or video dimensions

Anniversary Calculator

英語

Dates for day 100, day 1000 and yearly anniversaries from a start date

Fuel Cost Calculator

英語

Trip fuel cost, cost per person and fuel economy from a fill-up

Shoe Size Converter

英語

Convert Korean mm shoe sizes to US, UK, EU and Japan sizes, and back

Ring Size Calculator

英語

Convert ring diameter and circumference, and match your finger to your own size chart

Tire Size Calculator

英語

Overall diameter from a tire code, plus speedometer and odometer error for a new size

Recipe Unit Converter

英語

Convert cups, spoons, grams and milliliters using ingredient densities

Recipe Scaler

英語

Paste ingredients and scale amounts and units to any number of servings

Trip Expense Splitter

英語

Settle group expenses with the fewest payments and copy a shareable summary

BMR and TDEE Calculator

英語

BMR, TDEE and a calorie target from four published equations

Due Date Calculator

英語

Due date and gestational age from your last period or a fertility procedure

Ovulation Calculator

英語

Ovulation and fertile window estimates from your cycle, as a table and calendar

Body Fat Calculator

英語

Body fat percentage from the US Navy tape method or a BMI estimate

Macro Calculator

英語

Split a calorie target into grams of carbs, protein and fat

Ideal Weight Calculator

英語

Normal weight range for your height, with ideal weight formulas side by side

Period Calendar

英語

Next period dates as a table and calendar, with saved records and an average cycle

Pregnancy Weight Gain

英語

Recommended pregnancy weight gain by pre-pregnancy BMI, with a week-by-week reference range

Case Converter

英語

See nine case formats side by side and copy the one you need

Text Diff

英語

A diff checker that highlights what changed between two texts

Markdown Preview

英語

A live Markdown editor with sanitized HTML you can copy or save

Sort Lines

英語

Sort or shuffle lines with natural number ordering

Remove Duplicate Lines

英語

Delete repeated lines and keep the first of each, in order

Text to Speech

英語

Read text aloud with your browser's voices, with speed and pitch controls

Lorem Ipsum Generator

英語

Classic Lorem Ipsum by paragraphs, sentences or words, with optional HTML tags

HTML to Text

英語

Extract readable text from HTML with paragraph and link options

Typing Speed Test

英語

A typing speed test with net WPM, accuracy and clear scoring rules

Reaction Time Test

英語

A click-on-green reaction time test with five-try average and median

Keyboard Tester

英語

A key-by-key keyboard tester with held keys and rollover count

Dead Pixel Test

英語

A full screen color cycle to find dead and stuck pixels, plus optional flashing

Biorhythm Calculator

英語

Physical, emotional and intellectual cycles from your birth date

JSON Formatter

英語

Beautify, minify and validate JSON, sort keys, errors with line and column

Base64 Encoder/Decoder

英語

A Base64 encoder and decoder that gets Unicode right

Regex Tester

英語

JavaScript regex tester with flags, match highlighting, group table and replace preview

URL Encoder/Decoder

英語

A URL percent-encoder and decoder that handles Unicode and emoji

JWT Decoder

英語

Decode JWT header and payload and check expiry (no signature verification)

Hash Generator

英語

MD5 and SHA hashes for text and files, computed in the browser

Password Generator

英語

A random password generator built on the browser's crypto RNG

JSON to TypeScript

英語

Infer TypeScript types from JSON samples, including nested objects and arrays