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Count characters, words, and lines.
Convert text case (upper, lower, etc).
Remove duplicate lines and sort.
Remove extra spaces and empty lines.
Generate dummy text.
Convert data storage units (GB/MB/KB).
Calculate days between dates.
Calculate age from birthdate.
Calculate percentages.
Calculate Body Mass Index.
Stopwatch with laps.
Convert dog years to human years.
Convert cat years to human years.
Convert Western years to Japanese Eras.
Calculate sale price and savings.
Encode/Decode Base64.
Format and validate JSON.
Generate random UUIDs.
Encode/Decode URLs.
Escape special characters.
Convert Epoch/Date.
Generate secure passwords locally.
Create QR codes.
HEX, RGB, HSL converter.
Calculate dimensions based on ratio.
Cut audio files in browser.
Build structured prompts for ChatGPT, Claude, and Image AI.