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Free online standard calculator for addition, subtraction, multiplication, and division — with keyboard support, memory, percent, and session history.

Summarize long text into clear, concise key points with AI assistance.

Calculate exact age from date of birth in years, months, and days — free, private, and leap-year accurate.

Reverse characters, words, or lines of any text. Unicode-aware character reverse.

Combine multiple PDF files into a single document in seconds.

Create QR codes from text or URLs and download PNG or SVG.

Remove duplicate lines from lists while keeping first occurrences. Optional case-insensitive and trim modes.

Beautify or minify JSON online with validation, copyable output, and clear error messages.