ToolHouse - Free Online Tools + Practical Knowledge Blog
A free online tool platform providing 418 free, no-registration, no-login practical tools, covering time calculation, image processing, document conversion, data query, hardware testing, and more. Continuously updating 140 original technical blog posts, sharing Windows system tips, Excel practical tutorials, traditional culture knowledge, hardware troubleshooting, and other useful content.
All tools run locally in your browser, your files are never uploaded to any server. We adhere to privacy-first, completely free, and continuously updated principles, committed to creating a clean and practical online tool haven.
🔧 Recommended Tools
View All Tools →⏰ Time Tools
More →Online Stopwatch
Precise timing, record time points, supports full-screen mode and data export
Analog Clock
Analog clock, supports automatic setup, can simulate exam room clock
Digital Clock
Real-time display of current time, supports flip animation, supports multiple themes
Countdown
Custom target time, real-time countdown reminder
Global Time
View real-time time across global time zones
Ba Zi (Four Pillars of Destiny)
Generate Ba Zi based on birth date
Countdown Days
Countdown days web version
Pomodoro Technique
Time management tool alternating focus and rest
💻 Computer Tools
More →Microphone Test
Quickly test if your microphone is working online
Camera Test
Quickly test if your camera is working online
Speaker Test
Quickly test if your speakers are working online
Keyboard Test
Quickly test if your keyboard is working online
IP Lookup
Look up IP information online
Mouse Sensitivity Converter
Convert sensitivity between popular games online
eDPI Calculator
Accurate mouse sensitivity calculation tool for all games
MAC Address Vendor Lookup
Look up the vendor of a MAC address online
💰 Financial Tools
More →Compound Interest Calculator
Free online compound interest investment calculator, supports periodic additional principal contributions and visual growth trend charts.
Bank Deposit Interest Calculator
Intelligently calculates the final earnings of three mainstream deposit products, fully compliant with actual bank interest calculation rules.
🎬 Video Tools
More →m3u8 Downloader
Parse and download m3u8 format videos
m3u8 Player
Play m3u8 format video files online
mpd Player
Play mpd format video files online
mp4 Player
Play mp4 videos online
Torrent to Magnet
Convert torrent to magnet link online
LRC & SRT Subtitle Converter
Bidirectional conversion between LRC and SRT, timeline adjustment, local processing for security
SRT to TXT Converter
Free online tool to convert SRT files to plain text TXT, with file preview and encoding options, secure local processing
SRT Subtitle Fixer
Free online SRT subtitle repair tool, supports sequence renumbering, timestamp protection, HTML tag removal, blank line deletion, and intelligent subtitle format fixing, secure local processing
🎤 Audio Tools
More →🖼️ Image Tools
More →Seal Maker
Create circular seals online
Text to SVG
Convert text to SVG online
HEIC Converter | Preview
Support HEIC online preview and conversion to other image formats
QR Code Parser & Generator
Parse QR codes / Generate QR codes
EXIF Info Viewer
View EXIF metadata information
JFIF Format Converter
Convert JFIF to other image formats
ICO Converter
Convert ICO to other image formats
WEBP Converter
Convert WEBP to other image formats
📄 Document Tools
More →Md to PDF | Word
Quickly convert Markdown to PDF or Word
File Rename
Support batch file renaming
File Compression
Support compression and decompression of zip, tar, gz formats
Excel File Online Compression
Support online Excel file compression
PPT File Online Compression
Support online PPT file compression
Word File Online Compression
Support online Word file compression
TAR File Archiver
Support TAR file packaging
ZIP File Archiver
Support ZIP file packaging
📝 Text Tools
More →Chinese to Pinyin Converter
Free online tool to convert Chinese characters to Pinyin. Supports multiple Pinyin formats and pronunciation audio. An essential tool for learning Mandarin.
Chinese to Cantonese Pinyin Converter
Free online tool to convert Chinese characters to Cantonese Pinyin. Supports Cantonese pronunciation audio. An essential tool for learning Cantonese.
Simplified-Traditional Chinese Converter
Online tool for converting between Simplified and Traditional Chinese.
Chinese to Pinyin
Online Chinese character to Pinyin conversion tool.
Numbers to Chinese Uppercase
Convert numeric amounts to Chinese uppercase format.
Invoice Date to Chinese Uppercase
Convert invoice dates to Chinese uppercase format.
Special Symbols Quick Lookup
Quickly look up special symbols.
Fancy Text Generator
Generate stylish English text online.
📊 Data Tools
More →Arrow Symbols Collection
Includes hundreds of common and special arrow symbols, clearly categorized, one-click copy
Emoji Query Tool
Online Emoji information lookup
Excel Shortcut Query Tool
Covers all versions of Excel 2016/2019/365, with 92 high-frequency shortcuts categorized by scenario, boosting spreadsheet efficiency
Mac Shortcut Query Tool
Covers all Mac chipsets Intel/M1/M2, with 92 high-frequency shortcuts categorized by scenario, boosting operational efficiency
Windows Shortcut Query Tool
Covers all versions of Windows 10/11, with 78 high-frequency shortcuts categorized by scenario, boosting operational efficiency
Sunrise & Sunset
Sunrise and sunset time lookup
I Ching 64 Hexagrams Query Tool
Explore the wisdom of the I Ching's 64 hexagrams, query hexagram images, line statements, hexagram statements, and commentary details
Geographic Elevation Lookup
Get the current location's elevation and latitude/longitude information
📚 Education Tools
More →Periodic Table
Online periodic table of elements
Scientific Calculator
Precise calculation supporting complex formulas and functions
Circle Area/Circumference Calculator
Calculate circle area and circumference
Fraction Calculator
Perform calculations in fraction form
Fraction Simplifier
Online fraction simplification calculator
Variance/Standard Deviation Calculator
Calculate variance and standard deviation online
Cone Surface Area Formula Calculator
Quickly calculate surface area by entering cone base radius and slant height, look up cone surface area formulas, and master lateral and base area calculation methods
Nth Power Calculator Online
Quickly calculate nth power results by entering base and exponent, supports positive/negative and decimal exponents, master power operation methods
🔢 Math Tools
More →System of Linear Equations in Two Variables Calculator
Solve systems of linear equations in two variables online
Permutation and Combination Calculator
Calculate permutations and combinations online
Factorization Calculator
Calculate factorization online
Factorial Calculator
Calculate factorials online
Fraction Calculator
Calculate fractions online
Function Graph Generator
Generate function graphs by entering a function
Greatest Common Divisor Calculator
Calculate the greatest common divisor online
Least Common Multiple Calculator
Calculate the least common multiple online
🔮 Metaphysics Tools
More →Twelve Stages of Longevity Calculator · Eight Characters Four Pillars Ten Gods Status｜Heavenly Stems and Earthly Branches Prosperity/Decline Query｜Traditional Culture Tool
Enter Gregorian/Lunar birth date and time to accurately generate the Eight Characters Four Pillars chart, and calculate the corresponding Twelve Stages of Longevity status and Ten Gods relationships for each Heavenly Stem
Name Scoring Test Tool
Free online name score test, based on multi-dimensional analysis including Five-Grid Numerology, Five Elements Balance, and Three Dispositions Configuration
Nayin Fortune Calculator
Calculate Nayin Five Elements based on Eight Characters birth chart, query Five Elements attributes
Phone Number Numerology Analysis
Multi-dimensional analysis of phone number numerological characteristics based on traditional numerology, Five Elements balance, I Ching Eight Trigrams
Shen Sha (Spirit Deities) Query
Online Eight Characters Traditional Star Spirits Query Table | Traditional Eight Characters Spirit Deities Reference
Book of Answers
Online Book of Answers | Random Answer Generator | Psychological Guidance and Decision-Making Inspiration Tool
Xiao Liu Ren Divination
Xiao Liu Ren Traditional Query | Traditional Lunar Calendar Folk Custom Tool | Hourly Auspicious/Inauspicious and Traditional Reference
� Health Tools
More →Blood Pressure Normal Range Calculator · Age & Gender Stratified
Enter age, gender, systolic pressure (high) and diastolic pressure (low) to get real-time blood pressure health assessment based on age and gender
Ancient Five Elements Sound Meditation
Five elements sound guidance to assist meditation and relaxation
Scientific Sleep Calculator
Calculate optimal sleep/wake times based on your daily routine
Blood Type Calculator
Calculate possible blood types for children based on parents' blood types
Eyelid Twitch Omen Query
Check traditional beliefs about eyelid twitching at different hours
BMI Calculator
Calculate Body Mass Index
BMR Calculator
Basal Metabolic Rate Calculator
Schulte Grid
Free attention training tool
📏 Unit Tools
More →Length Unit Converter
Precision conversion between international, Chinese customary, imperial/US customary, and engineering length units
Binary to Decimal Converter
Professional online tool for converting binary fractions to decimal. Supports integer + fractional binary to decimal conversion, automatic binary format validation, detailed conversion steps and calculation process, customizable result precision
Area Unit Converter
Real-time conversion between common area units including square meters, hectares, square kilometers, square feet, etc.
Meters to Feet Converter · Online Length Unit Conversion Tool
Free online meters to feet converter supporting two-way precise conversion between meters, feet, and inches. Uses international standard conversion factor 1 meter = 3.28084 feet. Results retain multiple decimal places, suitable for travel, height measurement, architectural design, sports data, and other length conversion needs.
🔐 Secret Tools
More →Random Password Generator
Generate strong passwords with customizable length and character sets (digits, uppercase/lowercase letters, symbols), supports batch generation
Password Strength Checker
Multi-dimensional analysis of password complexity and entropy, with estimated crack time and improvement suggestions
Breach Database Check
Check online whether a password appears in known public credential stuffing databases (privacy-protected via k-Anonymity)
MD5 Hash
Generate a 128-bit hash value, commonly used for file integrity verification or quick fingerprinting
SHA-256/224 Hash
A highly secure 256-bit digest, a core algorithm for digital signatures and blockchain
SM3 National Cipher Digest
Standard of China's State Cryptography Administration, suitable for domestic security and government application scenarios
HMAC Authentication
Keyed-hash authentication based on MD5/SHA, used to verify message integrity and sender identity signature
AES Encryption/Decryption
Industry-grade Advanced Encryption Standard, supporting CBC, CFB, CTR, OFB, and ECB modes
🎨 Color Tools
More →Color Picker
Professional online color picker. Upload an image to extract colors in real time. Supports multi-format conversion including RGB/HEX/HSL/CMYK/HSV, and generates color schemes with one click.
Color Converter
One-click conversion between multi-dimensional color models · Supports HEX · RGB · HSL · CMYK · OKLAB
Color Mixer
Professional digital color mixing workbench based on CIELAB perceptual algorithm
RGB Color Chart
A color library and numerical reference tool for professional designers · Includes 500+ curated color values
Accessibility Color Contrast Checker
Based on international standard algorithms, accurately calculates the visual contrast between text and background to optimize web accessibility reading experience.
🏠 Convenience Tools
More →📦 Other Tools
More →ASCII Converter · Online Character Encoding Tool | Text & ASCII Mutual Conversion
Free online ASCII converter, bidirectional conversion between characters and ASCII codes, also displays binary and hexadecimal encoding.
Base Converter
Supports quick conversion between bases 2-36
Animal Age Calculator
Convert equivalent ages between common animals and humans
File/String to MD5
Calculate MD5 of files and strings online
Color Wheel
Online color palette / color wheel
Base32 Encode/Decode Tool
Free online Base32 encoder/decoder, supports text to Base32 mutual conversion, provides standard Base32 encoding/decoding functions, simple and efficient
Caesar Cipher Encrypt/Decrypt Tool
Enter text and shift amount to quickly encrypt/decrypt Caesar cipher, supports custom shift, clearly displays encryption/decryption results
Pigpen Cipher Encrypt and Decrypt
Enter text to quickly encrypt/decrypt Pigpen cipher, visually displays the mapping between characters and Pigpen symbols, clearly presents encryption/decryption results