See-Tool Online Tools Collection

Powerful scientific calculator with basic operations and advanced functions

Calculate BMI (Body Mass Index) from height and weight and assess health risk

Calculate target weight, healthy range and BMI from height and sex, with side-by-side ideal weight formula comparison

Calculate perimeter/area (2D) and surface area/volume (3D) with formulas and preview

Simplify aspect ratio from width/height with presets, custom ratios, dimension conversion and proportional scaling

Professional temperature unit converter supporting fast conversion between Celsius, Fahrenheit, Kelvin, Rankine and more.

Professional volume unit converter supporting precise conversion between cubic meters, liters, milliliters, gallons, fluid ounces and more.

Professional byte unit converter supporting fast conversion between Bit, Byte, KB, MB, GB, TB, PB, EB and more storage units.

Build, validate and interpret Cron expressions through visual interface with next run time preview

Calculate date intervals, add or subtract days with business day calculation and age calculation

Professional time unit converter supporting fast conversion between milliseconds, seconds, minutes, hours, days, weeks, months, years and more.

Convert normal dates to RedNote-style superscript year and subscript month/day format, supporting multiple input patterns and one-click copy.

Professional Gregorian–Lunar date converter supporting two-way conversion between Gregorian and Chinese lunar calendar, with detailed Gan-Zhi cycle, zodiac, solar terms and festivals.

Convert between Unix timestamps and human-readable datetime with multi-timezone and format support

Instantly convert time across global timezones with automatic daylight saving adjustment, meeting planning and real-time world clock

Convert between UTC time and GPS week/second, BeiDou time with Julian day calculation and batch processing

Convert plain text into ASCII art banners with font, layout and width options

Lookup standard ASCII characters with decimal, hexadecimal, octal, binary and HTML entity mappings

Generate pseudo-serious articles from a topic and length for writing practice and placeholder copy

Generate local Alipay receipt voice prompts from amount input with standard and Koubei styles

Compare differences between two text blocks or files with character-level and line-level comparison

Add line numbers to multi-line text with customizable format, alignment, and position

Generate placeholder text for design prototypes and web development

Add two spaces at the end of each line for proper line breaks in Markdown writing

Convert text between various encoding formats, supporting binary, octal, decimal, hexadecimal and other base conversions

Upload any file to calculate and display its hexadecimal bytes with drag-and-drop, file info and HEX copy/download

Online file merge and split tool that splits text files by lines or size and merges multiple files with custom separators

Name colors from HEX/RGB/HSL with confidence, format conversion, distribution and palette generation for design and frontend development

Encode text into socialist core values phrases or decode core values strings back into the original text

Upload an avatar, add National Day stickers, adjust with drag/scale/rotate, and export PNG images

Generate unique identifiers (UUID/GUID) with custom format support

Generate 50-950 shades from a base color and export Tailwind config and CSS variables for branding and theming

Generate MD5 hash values for text or files. Supports file verification, data integrity checking with multiple input/output formats

Generate MD4 hash values for text or files. Supports multiple input/output formats, compatible with legacy systems

Calculate MD5, SHA1, SHA256, SHA512, SHA3, RIPEMD160 hashes online. Supports local processing for large files.

Online SHA1 hash calculator for text and files with local processing, Hex input and algorithm switching, ideal for checksum and integrity verification

Online SHA224 hash calculator for text and files with local processing, Hex input and algorithm switching for checksum and integrity verification

Online SHA256 hash calculator for text and files with local processing, Hex input and quick copy for checksum and integrity verification

Online SHA384 hash calculator for text and files with local processing, Hex input and algorithm switching for checksum and integrity verification

Online SHA512 hash calculator for text and files with local processing, Hex input and quick copy for checksum and integrity verification

Professional online JSON parser, formatter, validator, and minifier

Online SQL Beautifier, Minifier and Converter

Format or compress HTML code with custom indentation and real-time preview

Format or compress CSS code with custom indentation and comment preservation

Online JavaScript Code Beautifier, Formatter and Minifier

Online TypeScript formatter and minifier with indentation, semicolons, quotes, and comment preservation

Format Python code with Black-style indentation and configurable line length

Online PHP formatter and minifier with indentation options and comment retention

View webpage source with custom UA, Referer, Cookie and POST parameters, or extract text, forms and links

Look up domain ICP filing number, registrant entity and review date online

Check domain block status on Tencent Security, QQ, and WeChat with reasons

Convert IPv4 numeric addresses and dotted IPs in batch with multiple delimiters

Online MAC address format converter supporting colon, hyphen, dot, plain and Cisco formats, with case toggle and batch conversion

Convert Chinese domains and Punycode with auto-cleaning of prefixes and trailing slashes

Check HTTP status codes and redirect chain for a URL with headers, server info and timing

Lookup DNS records for a domain with A/AAAA/CNAME/TXT/NS/SOA and multiple DNS servers

Generate custom QR codes for text, URLs, WiFi, business cards, email, SMS and more

Generate professional barcodes in multiple formats including Code128, EAN-13, UPC-A with batch generation

RGB color reference table with name, RGB and Hex values, searchable and copyable

Material Design 3 (MD3) official palette reference with one-click HEX copy and full palette config export

Powerful color picker, converter and palette generator supporting HEX, RGB, HSL, CMYK formats

Generate harmonious color schemes, create gradients and blend colors with multi-format export

Convert images to Base64 strings or restore Base64 to images. Supports PNG, JPG, GIF, WebP, SVG

Online image compressor supporting JPG/PNG/WebP with batch compression and quality control to reduce file size