All Online Tools & Free Calculators

Convert international text characters into Unicode escape sequences (\uXXXX and \u{XXXXX}) and decode escape sequences back into readable UTF-8 text.

Check JSON Web Token (JWT) expiration timestamps (exp, iat, nbf), calculate remaining validity lifetime, and inspect payload claims.

Generate time-ordered, sequential UUID v7 identifiers compliant with RFC 9562 to optimize B-Tree database indexing performance.

Format, sort alphabetically, and beautify .env configuration files with aligned keys, deduplicated variables, and clean section headers.

Validate .env configuration files to detect syntax errors, invalid character keys, unescaped newlines, and duplicate environment variables.

Build standard POSIX crontab expressions visually using intuitive dropdowns and selectors for minutes, hours, days, months, and weekdays.

Calculate your Eight Mansions (Ba Zhai) Kua Number and personalized auspicious compass directions instantly.

Check Four Conflicts zodiac clash groups, direct 180° oppositions, and Feng Shui harmony remedies.

Calculate Three Harmonies (Tam Hop) triads and Six Celestial Pairs (Luc Hop) for life and business.

Calculate 4 Auspicious and 4 Inauspicious compass directions based on Cung Phi Bagua.

Calculate Bagua Trigram (Cung Menh) and Eastern/Western compass groups by birth year and gender.

Calculate your Five Elements (Ngu Hanh) birth element, 30 Nap Am, and lucky colors.

Convert Gregorian birth years into Heavenly Stems (Can), Earthly Branches (Chi), and Nap Am elements.

Calculate nominal age, identify 9 annual ruling stars (Sao Chieu Menh), and earthly terms (Han).

Calculate Lunar nominal age (Tuoi Am) and check Tam Tai, Kim Lau, and Hoang Oc milestones.

Generate custom, high-resolution QR codes with customizable colors, error correction levels, and SVG/PNG vector downloads.

Generate cryptographically secure, random passwords with customizable length, symbols, numbers, and entropy calculation.

Validate XML syntax and document well-formedness against W3C standards, detecting unclosed tags, root element violations, and syntax errors.

Format, beautify, and indent minified XML documents and SOAP messages with clean, standardized XML tag hierarchies.

Minify and compress JavaScript source code by stripping whitespace, comments, and newlines to accelerate web application execution speeds.

Format and beautify unindented or minified JavaScript (ES6+) code with standardized 2-space indentation, clean spacing, and structural alignment.

Minify and compress CSS stylesheets by stripping whitespace, comments, and redundant characters to accelerate webpage render speeds.

Format and beautify messy or minified CSS stylesheets with consistent indentation, selector spacing, and clean rule blocks.

Minify and compress HTML documents by stripping whitespace, comments, and line breaks to optimize web page loading speeds and Core Web Vitals.