AI225 Online Toolbox
A curated collection of practical tools for text processing, image conversion, development assistance, and more. No installation required, ready to use instantly, with 100% local processing to ensure your data privacy.
My Favorites
Recent
Text Processing
Markdown Editor
A powerful free online Markdown editor. Supports GFM extensions, Mermaid diagrams, LaTeX math formulas (KaTeX), [TOC] table of contents, footnotes, and code highlighting.
Markdown to HTML
Convert Markdown to HTML with tables, task lists, code highlighting, and formulas.
HTML to Markdown
Convert HTML code to Markdown format with one click, supports common tags.
Mermaid Diagram Editor
Completely free pro Mermaid diagram editor with live preview, templates, export options, and hand-drawn style.
Mind Map
Professional online mind map tool with keyboard shortcuts, node dragging, and multiple export formats.
Chinese Pinyin Converter
Powerful Chinese to Pinyin converter with support for tones, initials mode, and smart polyphonic processing.
Pinyin to Chinese Characters
Reverse lookup Chinese character candidates from pinyin, supporting formats like shang4, shàng, and lv2.
Cantonese Jyutping Converter
Convert Chinese characters to Cantonese Jyutping with number tone and polyphonic support.
Martian Text Converter
Converts text between Simplified, Traditional, and Martian (Spark) text.
Markdown to Mind Map
Powerful Markdown to Mind Map tool with KaTeX formulas, syntax highlighting, tables & images, live preview, fullscreen editing, MD import, image export, and Tab indentation.
Text Deduplicator
Simple and efficient text deduplicator. Supports line or paragraph processing with multiple sorting options.
Text Sorter
Sort lines with lexicographic or numeric mode, unique and ignore-case options.
Random Line Picker
Pick random lines for draws, roll calls, or sampling.
Text Reverser
Text reverser for characters, words, and lines.
Whitespace Cleaner
Clean extra spaces and blank lines for tidy text.
Text Cleaner
Remove specific character types with live preview.
Line Numberer
Add or remove line numbers with custom start and separator.
ASCII Code Reference Table
Complete ASCII character encoding reference with search, filter, and quick copy.
Chinese Converter
Professional online simplified/traditional Chinese converter supporting Mainland, Taiwan, and Hong Kong standards.
Text Diff
Online text diff tool with support for side-by-side and unified views, providing word-level diff highlighting.
Word Counter
Professional online word counter with 20 metrics including mixed-language support, visible characters, and reading time.
Text Frequency
Analyze text frequency and identify top words or characters quickly.
Case Converter
Convert English cases and naming styles with live preview; copy result easily
Text Replace
Online text find and replace tool with support for regex, whole word, and case sensitivity.
Lorem Ipsum Generator
Quickly generate Lorem Ipsum placeholder text in various formats.
HTML Text Extractor
Online HTML text extractor with support for removing tags, scripts, and preserving formatting.
Chinese Stroke Order
Online Chinese stroke order animation and practice tool, supporting single and multiple character modes
Chinese Stroke Query
Enter Chinese characters to view stroke order and count, quick and easy.
Chinese Radical
Simple Chinese radical finder supporting batch input.
Emoji Picker
Comprehensive Emoji library with search and one-click copy.
Special Symbols
Comprehensive special symbols library with search and one-click copy.
Fancy Text Generator
Various Unicode text styles: Bold, Italic, Script, Fraktur, Circled, and more. One-click copy.
Team Generator
Enter names to randomly generate teams or groups.
ASCII Art Generator
Convert text to beautiful ASCII art with various classic font styles.
Kaomoji Collection
Rich Japanese kaomoji emoticons organized by category, one-click copy.
Kaomoji Editor
Visual kaomoji editor with component building, random generation and save management.
Developer Tools
JSON Formatter
Professional JSON formatter with syntax highlighting, auto-correction, minification, and validation.
JSON Tree Viewer
Visualize JSON as a tree with search, path copying and hierarchy browsing.
JSON Schema Generator
Generate JSON Schema from JSON for validation and constraints.
JSONPath Tester
Query JSONPath and preview results instantly.
JSON to TypeScript
Generate TypeScript interfaces/types with array object merging and optional fields.
NDJSON Converter
Convert between NDJSON / JSONL and standard JSON arrays.
SQL Formatter
SQL code formatter, beautifier and minifier supporting 10+ database dialects.
XML Formatter
Professional XML formatter with syntax highlighting, auto-correction, minification, and validation.
HTML Formatter
Professional HTML formatter with syntax highlighting, auto-correction, and minification.
CSV / JSON Converter
Convert CSV and JSON with header and delimiter options.
YAML / JSON Converter
Convert between YAML and JSON with real-time conversion and validation.
Regex Tester
Full-featured regex tester with highlight preview and group details.
HTTP Status Codes
Quick reference for HTTP status code meanings and usage.
CSS Formatter
CSS formatter and multi-level minifier supporting beautification, single-line compression, and full minification.
CSS Box Shadow Generator
Powerful CSS Box Shadow generator supporting multiple layers, real-time preview, and code generation.
CSS Gradient Generator
Visual generator for linear/radial gradients with multiple color stops and quick copy.
Glassmorphism Generator
Generate CSS or Tailwind Glassmorphism effects with live preview and code copy.
JS Compressor
JS formatter and minifier supporting beautification, whitespace removal, and code obfuscation.
JS Obfuscator
Deeply obfuscate JavaScript code with multi-level protection schemes to prevent easy reverse engineering.
JSON Diff
Compare two JSONs and highlight added/removed/modified lines.
UUID Generator
Online UUID v4 generator with support for batch generation and multiple formatting options.
NanoID Generator
Online NanoID generator with support for batch generation and custom alphabets.
ULID Generator
Online ULID generator with support for batch generation and time-sortable feature.
UserAgent Analyzer
Online UserAgent parser for quick identification of browser, OS, and device information.
Cron Expression Generator
Visual cron builder with presets, validation, and preview.
MAC Address Generator
Batch MAC generator with vendor prefixes, history, and format options.
Chmod Calculator
Linux file permissions calculator, supports octal and symbolic modes.
Meta Tag Generator
Generate SEO Meta tags including Open Graph and Twitter Cards.
Keyboard KeyCode Checker
Real-time keyboard event and KeyCode checker.
CSS Grid Generator
Visual CSS Grid layout generator with alignment and auto-flow controls.
CSS Flexbox Generator
Visual CSS Flexbox generator with controls for direction, alignment, ordering, and item properties.
CIDR Calculator
Quickly calculate CIDR, subnet mask, network address, and usable IP range.
CSS Clip-path Generator
Visual CSS Clip-path generator with presets and drag-and-drop controls.
PX / REM Converter
Realtime PX / REM converter with base size and precision controls.
Email Validator
Validate emails in bulk with single-email anatomy, RFC compliance checks, and DNS record lookups.
JSON to Go Struct
Convert JSON to Go Struct instantly with nested struct and tag support.
JSON to Python Pydantic
Convert JSON to Python Pydantic models instantly.
Mouse Test
Test all mouse buttons, scroll wheel, double-click, and drag functionality online.
Encoding
Base64 Encoder/Decoder
Convenient Base64 converter with bi-directional encoding/decoding, customizable prefix, and live preview.
Base32 Encoder/Decoder
Lightweight Base32 codec with padding, case options, and local processing.
Base58 Encoder/Decoder
Base58 codec with text, hex, and decimal integer conversion support.
Base62 Encoder/Decoder
Base62 codec with text, hex, and decimal integer conversion support.
Base85 Encoder/Decoder
Base85/ASCII85 encoder and decoder with z compression and <~ ~> format.
Base16 Encoder/Decoder
Lightweight Base16 codec with case options and local processing.
Text Compressor
Text compression tool supporting LZ-String, Gzip, and Deflate formats.
ASCII Code Converter
Bidirectional converter between text and ASCII (Dec/Hex/Oct/Bin) with escape sequences and customizable separators.
URL Encoder/Decoder
Online URL encoder and decoder with support for both encodeURI and encodeURIComponent modes.
Base Converter
Convert between bases 2–36; supports integers, fractions, negatives; auto-detect 0b/0o/0x
Text to Binary Converter
Online text and binary converter with support for real-time conversion and privacy protection.
Unicode Converter
Online Unicode and text converter with automatic recognition of multiple formats and real-time mapping.
HTML Entity Encoder/Decoder
Online HTML entity encoder/decoder supporting named entities, numeric entities, and auto-detection.
Base91 Codec
Encode and decode Base91 online, supports text and hexadecimal formats.
Security Tools
MD5 Generator
Fast and secure online MD5 generator supporting 16/32-bit formats and one-click case switching.
SHA-1 Generator
Generate SHA-1 hashes with hex and Base64 outputs.
SHA-256 Generator
Generate SHA-256 hashes with hex and Base64 outputs.
SHA-512 Generator
Generate SHA-512 hashes with hex and Base64 outputs.
HMAC Generator
Generate HMAC signatures from message and secret with multiple algorithms and formats.
File Hash Checker
Compute file hashes locally with MD5/CRC32/SHA-1/SHA-256/SHA-512 and more.
JWT Decoder
Decode JWT instantly with header/payload and expiry status.
JWT Generator
Generate or verify JWTs with custom header, payload, and secret using HS/RS/ES algorithms.
Password Generator
Strong password generator with custom rules, batch generation, and real-time security estimation.
RSA Key Generator
Securely generate RSA public and private key pairs with various lengths and purposes, fully local processing.
Password Strength Checker
Online password strength checker to evaluate security level and provide improvement tips.
Caesar Cipher
Caesar cipher encoder/decoder with custom shifts and ROT13.
Vigenere Cipher
Vigenere cipher encoder/decoder with key validation and case preservation.
Pigpen Cipher
Pigpen cipher encoder/decoder with symbol keyboard and mapping table.
Morse Code Converter
Bidirectional Morse code converter with audio playback, download and reference chart.
AES Encryption/Decryption
Secure encryption tool based on AES-GCM mode with custom password, runs entirely locally.
Image Tools
Barcode Generator
Online barcode tool supporting 20+ formats with custom styles, text settings, SVG/PNG download, and copy to clipboard.
Barcode Decoder
Decode barcodes from images with multi-format support and local processing.
GIF Maker
Create GIF animations from images with custom frame delays, reordering, and quality settings.
QR Code Generator
Flexible QR code generator with custom styles, dot/eye patterns, size/margin adjustment, and multi-format export.
QR Code Decoder
Powerful online QR code decoder supporting multiple input methods and fully local offline recognition.
WiFi QR Code Generator
Generate scannable WiFi QR codes with WPA/WEP/No password options.
vCard QR Code Generator
Generate contact QR codes that save directly to phone contacts.
Image Splitter
Powerful image splitter tool supporting custom grid slicing, fixed size splitting, and single chunk download.
Image Flipper
Online image mirror flip tool supporting horizontal and vertical flipping with local-only processing.
Image Rotator
Flexible online image rotation tool supporting any-angle adjustment and EXIF auto-correction.
Image EXIF Viewer
Quickly inspect EXIF metadata with search and JSON export.
Image EXIF Remover
One-click EXIF metadata removal for privacy.
Image Cropper
Simple online image cropper with multiple aspect ratios and free adjustment.
Image to Grayscale
Convert color images to high-quality black & white with mode and intensity controls.
Image to Sketch
Convert photos to sketch art with pencil, charcoal, or ink styles.
Image Color Inverter
Invert image colors to create negative effects with intensity control.
Image to Pixel Art
Turn images into pixel art with pixel size, color levels, and dithering.
Image Watermark
Add text or image watermarks with 3x3 positioning or full-page tile mode.
Image Compressor
Efficient online image compressor supporting JPEG/PNG/WebP with customizable quality.
Favicon Generator
Online Favicon generator tool that supports selecting images to generate ICO icons in various sizes. All processing is done locally without data upload.
SVG to PNG Converter
Online SVG to PNG converter with support for custom sizes, background colors, and live preview.
Image Format Converter
Free online image format converter with resize and quality adjustment options.
HEIC Converter
Convert HEIC/HEIF to JPG/PNG with quality control.
Image Resizer
Resize images with aspect lock and multi-format export.
Text to Image
Convert text into images with shadows, gradients, transparent background and multi-format export.
Image Stitcher
Merge multiple images with horizontal/vertical/grid layouts and detailed controls.
Image Mosaic
Easy-to-use online image mosaic tool. Supports rectangle selection, brush, and full-image mosaic modes with adjustable mosaic size. Processed locally, no server upload.
Image Blur
Multi-mode image blur tool supporting Gaussian/Motion/Radial blur.
Handwritten Signature Generator
Free online handwritten signature maker with transparent PNG export.
Meme Generator
Select image, add text, and create funny memes instantly.
Image Filter
Adjust image brightness, contrast, saturation online with various preset filters.
GIF Splitter
Easily split animated GIF into individual image frames and download as ZIP.
Color Tools
Color Picker
A full-featured online color picker with support for HEX, RGB, and HSL format conversion.
Image Color Picker
Pick colors from images with magnifier, history, and multi-format values.
Screen Color Picker
Pick colors from your screen and copy values instantly.
Color Contrast Checker
Check foreground/background contrast with WCAG AA/AAA results.
Color Palette
Curated online color palettes with various classic design-style color schemes.
Math Tools
BMI Calculator
Calculate BMI instantly with ideal weight range and health advice.
BFR Calculator
All-in-one body fat %, fat mass, and lean mass calculator.
WHR Calculator
Calculate WHR with gender-based risk ranges.
BMR Calculator
Calculate BMR and maintenance calories with cut/bulk guidance.
Child Height Calculator
Dual-method estimate with genetic range and growth factor prediction.
Child Blood Type Calculator
Predict possible child blood types with ABO + Rh inheritance and probabilities.
Discount Calculator
Quickly calculate discounted price and savings.
Percentage Calculator
Multi-function percentage calculator for values, ratios, and changes.
Aspect Ratio Calculator
Professional aspect ratio tool with visual preview, linked dimension calculation, and industry presets.
Tip Calculator
Simple tip calculator with custom percentages and bill splitting.
RMB Uppercase Converter
Convert between numeric amount and RMB uppercase with formatting options.
Chinese Number Converter
Convert numbers to Chinese numerals and back with multiple formats, decimals, negatives, percentages, fractions and currency.
Number to English
Convert numbers to English words with decimal support and formatting options.
Roman Numeral Converter
Convert between Arabic and Roman numerals (Range 1-3999).
Area Converter
Quick conversion between Metric, Imperial, and Chinese area units.
Length Converter
Quick conversion between Metric, Imperial, Chinese, and Astronomical length units.
Weight Converter
Quick conversion between Metric, Imperial, and Chinese weight units.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly.
Volume Converter
Quick conversion between Metric, US, Imperial, and Chinese volume units.
Data Converter
Quick conversion between Bit, Byte, KB, MB, GB, TB, PB, EB, ZB, YB and other data units.
Pressure Converter
Quick conversion between 20+ pressure units including Pa, psi, bar, atm, Torr.
Speed Converter
Quick conversion between Metric, Imperial, Nautical, Physics, and Astronomy speed units.
Power Converter
Convert W, kW, MW, TW, hp, BTU/h, RT, calories and more.
Download Time Calculator
Calculate download time for different bandwidths with automatic unit conversion.
Geo Distance Calculator
Calculate the shortest spherical distance between two sets of coordinates.
Calculator
Online calculator with standard and scientific modes, featuring precision settings, paste support, and history tracking.
Trigonometric Calculator
Input degrees or radians to quickly calculate all basic trigonometric functions.
Inverse Trigonometric Calculator
Input a value to quickly calculate all basic inverse trigonometric functions.
Prime Number Calculator
Multi-functional math tool for prime checking, factorization, and range generation.
Random Number Generator
Random number generator with range, count, unique, and sort options.
Standard Deviation Calculator
Quickly calculate standard deviation, variance, and mean for a dataset.
Compound Interest Calculator
Professional compound interest calculator with lump sum, regular deposits, goal planning, and growth visualization.
Time & Date
Date Calculator
All-in-one calculator for date difference and date add (days/weeks/months/years).
Age Calculator
Precise age and next birthday countdown with zodiac, Chinese zodiac and lunar info.
Safe Period Calculator
Estimate fertile window, ovulation, and safer days for regular or irregular cycles.
Perpetual Calendar
Perpetual calendar with Gregorian/Lunar mapping, festivals, and zodiac.
Stopwatch Timer
Professional stopwatch with lap splits, stats, and export.
Minimal Clock Screensaver
Elegant fullscreen clock with styles and clock drift.
Timestamp Converter
Convert between seconds/milliseconds and dates with local time or UTC.
Date Capitalizer
Convert dates to Chinese capital format for formal documents.
English Date Formatter
Convert dates to various English formats with custom patterns.
Countdown Timer
Preset or custom countdown with sound and progress.
Timezone Converter
Convert times across multiple cities for scheduling and collaboration.
Pomodoro Timer
Simple and efficient timer for the Pomodoro Technique.
Zodiac & Chinese Zodiac
Lookup your Western zodiac, Chinese zodiac, lunar date, and Ganzhi based on birth date.
Week Calculator
Quickly check which week of the year it is, and the yearly week progress.
Day of Year
Quickly check the day-of-year for today or any date, with progress and remaining days.
File Tools
Quick Online Extractor
Multi-format online extraction and preview with fully local processing.
Universal Archive Extractor
Powerful multi-format extraction with ZIP/7Z/RAR support.
Online ZIP Compressor
Local ZIP packer supporting multi-file and folder compression with structure preserved.
Image to PDF
Merge multiple images into PDF with page size, margin and quality settings.
PDF to Image
Convert PDF pages to images with PNG/JPG export and scale control.
PDF Merger
Merge multiple PDFs with ordering controls.
PDF Splitter
Split by pages or ranges and download as ZIP.
PDF Page Remover
Remove PDF pages by numbers and export a new file.
PDF Page Reorder
Reorder PDF pages and export a new file.
PDF Page Numberer
Batch add page numbers with range, style, and font weight controls.
PDF Watermark
Add text watermarks to PDF pages with color and opacity controls.
PDF Page Rotator
Rotate PDF pages with preview and page-range selection.
PDF Cropper
Crop PDF pages by margins or target size with range and preview.
PDF Signature
Add signature images to PDFs with page and position options.
Network Tools
AI Navigation
Curated AI tools organized by category, one-click access.
URL Query Parser
Parse URL query parameters into JSON and a parameter list.
UTM Link Builder
Generate UTM tracking links quickly for ads and channel analytics.
IP Lookup
Multi-source lookup for IP geolocation and ISP info for IPv4/IPv6/domains.
Whois Information Query
Quickly query domain registration info, including registrar, expiry, status, and DNS.
Video Tools
Local Video Player
Fully local video player with high-speed playback, fullscreen/mute shortcuts, and one-click HD screenshots.
Video to GIF
Convert videos to GIFs locally with trim, FPS, and size settings.
M3U8 Player
Simple and easy-to-use online M3U8 player with HLS protocol support and playback history.
Screen Recorder
Free HD online screen recorder with system audio and microphone support.
LED Scroller
Full-screen LED scrolling text with custom color, speed, and size. Perfect for concerts and pickups.
Audio Tools
Metronome
Precise online metronome with adjustable BPM, flexible time signatures, rhythmic subdivision, and count-in.
Decibel Meter
Real-time noise monitoring with dB stats and calibration.
Tone Generator
Supports Tone, Sweep, and Noise modes with multiple waveforms, 20Hz-20kHz adjustment, and visualizer.
Online Audio Recorder
Record in the browser with instant preview and download.
White Noise Generator
Multiple noise types and natural sounds with mixing and dynamic volume.
Audio Trimmer
Visual audio trimmer with fade effects and multiple format support.
Entertainment
Electronic Wooden Fish
Knock wooden fish online to accumulate merit with auto-knock and sound
Dice Roller
Online 3D dice roller tool, supports rolling multiple dice simultaneously with realistic physics animations.
Lucky Wheel
A visual lucky wheel. Enter options to pick randomly with fun spinning animation.
Alipay Red Envelope
Scan to get red envelopes every day. Supports token copying.
CPS Test (Click Speed Test)
Test your click speed (CPS) and challenge your limits.
Reaction Time Test
How fast are your reflexes? Click immediately when the color turns green!
What to Eat Today
Random food recommendations with filters and support for adding your own custom dishes.
Chinese Kinship Calculator
Enter a relationship chain to instantly find the correct Chinese kinship title.
MBTI Personality Test
Discover your MBTI personality type in just 5 minutes with 40 intuitive questions.
SBTI Test
A humorous yet hardcore abstract personality test that pierces the soul.
Enneagram Test
Professional Enneagram test to discover your personality potential.
Typing Speed Test
Real-time typing speed (WPM) and accuracy measurement with multiple languages and modes.
Why choose us?
Fast & Efficient
All tools run locally in your browser with instant response
Privacy First
No data is uploaded to the server; everything is processed locally
Completely Free
All features are free to use with no registration, ready to use instantly
Responsive Design
Works smoothly on desktop, tablet, and mobile