193+ Free Tools / No Registration Required
Collection of free useful tools
Text Tools (Character Counter, Text Conversion)
Image Tools (Image Compression, Resizing)
</> Developer Tools (JSON, Encoding)
✓Completely Free
✓No Data Sent
✓No Registration Required
🔍
📝 Text and Documents
🔄
CSV ⇔ JSON conversion
CSV/JSON mutual conversion + table preview.
data
✏️
Markdown Editor
Editor with real-time preview, HTML export support.
text
🔠
character code conversion
Character code conversion and byte string display for UTF-8/Shift_JIS/EUC-JP, etc.
text
📖
Ruby Editor
Kanji characters are furigana-ed and output in HTML/brackets format.
text
🔁
Text Replacement Tool
Batch application of multiple replacement rules. Regular expression support.
text
🗑️
delete duplicate rows
Duplicate row detection, removal, and extraction. Statistics included.
text
↕️
text sort
Row sorting. Alphabetical and natural sorting supported.
text
📄
word counter
Counting of characters, words, and reading time in multiple languages, with check for social networking restrictions.
text
🎨 Images & Design
🎨
Color Code Conversion
Mutual conversion between HEX, RGB, and HSL. Includes a color picker.
design
🔄
Image Format Conversion
PNG⇔JPG⇔WebP format conversion.
image
📐
Image Resize
Resize by pixel specification and ratio specification. Fixed aspect ratio support.
image
🎨
Color Palette Generator
Automatic generation of color scheme patterns such as complementary and similar colors from base colors.
design
🖼️
Box Shadow Generator
CSS box shadow generation with GUI. Supports multiple layers.
CSS
✨
Text Shadow Generator
Generates CSS text shadows. Includes presets for neon, emboss, etc.
CSS
📐
Flexbox Generator
Visual CSS flexbox configuration and code generation.
CSS
📏
Aspect Ratio Calculator
Calculates aspect ratios for images and videos. Includes major resolution presets.
design
🔧 For developers
🔐
Base64 encoding/decoding
Convert and restore text and images to Base64 format.
encode
⏱️
Unix time conversion
Timestamp ⇔ Convert human-readable date and time.
Hours.
⏰
cron-style parser
Enter a cron expression to display the next execution time.
Hours.
📏
CSS unit conversion
Conversion of px⇔rem⇔em⇔vw, etc.
CSS
🎯
JSONPath Tester
Test and display results of JSONPath queries in real time.
data
📖
HTTP Status Code Dictionary
List, search and detailed description of all HTTP status codes.
development
🔢
radix (numeration) conversion
Interconversion of 2/8/10/Hexadecimal numbers. Includes bitwise operation preview.
development
👁️
HTML previewer
Real-time preview of HTML/CSS/JS. Console output support.
development
💰 Living & Business
📐
unit conversion
Conversion of length/weight/temperature/area/volume/velocity/data.
calculation
🎂
age calculator
Calculates exact age, number of days, zodiac sign, and zodiac sign from date of birth.
calculation
⚖️
BMI Calculator
Calculates BMI value from height and weight. Judgment and standard weight display.
health
⏱️
stopwatch
Stopwatch with lap time measurement.
Hours.
🎰
Lottery and Roulette
Roulette draw. Weighting and grouping support.
random
🎲
dice
Multi-sided die support. Dice type input and history display.
random
⚡
Electricity bill calculator
Calculates electricity bills based on the power consumption of home appliances. Comparison function included.
calculation
📐
Unit conversion (extended version)
Conversion of area/volume/velocity/data volume/pressure/fuel consumption, etc.
calculation
📊 SEO/Web
📊
structured data generation
Generate Schema.org markup for JSON-LD.
SEO
💻
Binary-to-text conversion
Converts text and binary (01) to each other, also displays hexadecimal and decimal numbers.
development
📊
A/B Test Calculator
Calculate statistical significance, required sample size, and CVR improvement rate for A/B tests. Designed for marketers and data analysts. No registration required, free...
SEO
📈
Engagement Rate Calculator
Auto-calculate engagement rates from social media followers, likes, and comments. Compare with industry averages and get ratings. For Instag...
SEO
#️⃣
Hashtag Generator
Auto-generate Instagram and Twitter hashtags from keywords and categories. 300+ Japanese & English tags...
SEO
🔗
Link Landing Page Creator
Easily create a Linktree-style link landing page. Profile setup, 5 theme options, drag-and-drop reordering, HTML export...
SEO
🔒 Security
🔢 Calculation and Mathematics
🧮
function calculator
Scientific calculations including trigonometric functions, logarithms, powers, etc. History function included.
calculation
🔢
matrix calculator
Calculation of addition, subtraction, multiplication, inversion, determinant, and eigenvalues of matrices.
mathematics
📊
statistical calculator
Calculate basic statistics such as mean, median, standard deviation, etc.
statistics
📈
Graph Drawing Tools
Draws graphs from mathematical expressions. Simultaneous display of multiple functions.
mathematics
🎲
Probability, permutation and combination calculator
Calculation of nPr, nCr, and probability. Includes a display of the calculation process.
mathematics
🧩
Sudoku Solver
Generates Sudoku solutions and problems. Supports difficulty level selection.
puzzle
🗺️
Coordinate Converter
Convert between Decimal Degrees (DD), Degrees/Minutes/Seconds (DMS), and UTM coordinates. WGS84 ellipsoid compatible. Includes presets for Tokyo Tower, Mt. Fuji, and more...
calculation
➗
Fraction Calculator
Visually explain fraction operations. Shows steps for finding common denominators and simplifying. Supports mixed fractions, visualizes fraction bars, includes calculation history. No registration...
calculation
📦 File Conversion
🎵
Audio Waveform Display
Waveform and spectrum display of audio files. Trimming support.
voice
✂️
Audio Cutter
Cutting unnecessary parts of audio files. Edit visually with waveform display.
voice
📷
QR Code Reader
Online QR code and barcode reader from camera or image files. No installation required. Free, no registration needed...
file
🎮 Games
💣
minesweeper
Minesweeper with beginner to advanced and custom difficulty levels.
puzzle
🧱
Tetris
Tetris with Next Hold Ghost.
action
💬
typing game
Drop type typing game. Combo and score support.
typing
🃏
Memory Games
Nervous breakdown game. Multiple sizes and themes supported.
puzzle
🏃
Maze Generator
Automatic maze generation and play. Solution display support.
puzzle
🧬
life game
Conway's Life Game. Comes with preset patterns.
Simulation
🔨
whack-a-mole (game)
Hit the mole in 60 seconds! Combo for high score.
action
🐦
flappy bird
Click to make the bird fly and go through the pipes.
action
📖 Learning and Practice
🧠
mental arithmetic training
Practice the four arithmetic operations by difficulty level. Score recording with timer.
learning
📚
Four-character idiomatic quiz
Over 100 four-character phrases quiz. Guess the four-character phrases based on their meanings.
learning
🗂️
Flash Card Maker
Create your own flashcards for memorization study.
learning
⌨️
Typing speed test
Measures Japanese romaji typing speed; CPM, WPM, and accuracy rate.
practise
➕
Math Problem Generator
Automatically generates math problems for grades 1-6. Covers addition, subtraction, multiplication, and division. Includes timer and score management. Print mode...
learning
📡
Morse Code Trainer
Convert between text and Morse code. Supports audio playback and input practice mode. Free online tool supporting A-Z, 0-9, and Japanese text.
learning
📖
Speed Reading Trainer
RSVP-style speed reading training tool. Adjustable WPM, 3 sample texts, custom text input, and comprehension quizzes included. Improve reading speed...
learning
📏
Unit Conversion Quiz
Unit conversion practice for length, weight, and volume in game format. Learn units through fun multiple-choice quizzes. Perfect for elementary students. 3 difficulty levels...
learning
📌 Other
🔒
Text Encryption/Decryption
AES encryption completed within the browser. Password protection.
security
👁️
OGP Image Preview
Check how it looks when sharing SNS on Twitter/Facebook/Line/Slack.
SNS
📊
Gradient Banding Test
Detect monitor banding (color bands) with 256-level RGB and grayscale.
Other
⚡
Response Speed Test
Visually test your monitor's response speed (GtG) by observing the trailing bar.
Other
🌟 User-generated Tools
Tools created by users using AI.Create Your Own →
Frequently Asked Questions
Is ToolBox free to use?
Yes, all tools are available completely free of charge. There is no need to register for an account, just access the site and you are ready to go.
Is data sent to the server?
No. All tools are client-side. All tools run within the browser (client-side) and no input data is sent to an external server. Image compression, text conversion, etc. are all handled on your device.
Can I use it with my smart phone?
Yes. The site supports responsive design and can be used comfortably on all devices, including PCs, tablets, and smartphones.
What tools are available?
We provide 193 convenient tools including character counter, text conversion, image compression and resizing, JSON formatting, Base64 conversion, password generation, QR code generation, loan calculation, date calculation, SEO tag generation, and more. Tools are organized by category so you can easily find what you're looking for.
About ToolBox
ToolBox is a free online tool collection for web developers, designers, bloggers, and business professionals. You can use a wide range of tools for text processing, image editing, data conversion, SEO optimization, daily calculations, and more — all directly in your browser.
All tools run on JavaScript, and no data is ever sent to a server. Use them with confidence.