Free Online Tools for
Developers & Everyone

Paste any text or list and instantly remove duplicate lines. Supports all, consecutive, and unique-only removal modes. Free, private, runs 100% in your browser.

Encode or decode Base64 strings instantly. Supports UTF-8 text, images, and files. Free, private, runs 100% in your browser.

Generate strong, random passwords instantly. Customize length, character types, and avoid ambiguous characters. Cryptographically secure. Free, private, runs 100% in your browser.

Convert any text into SEO-friendly URL slugs instantly. Supports case sensitivity toggle and Unicode normalization. Free, private, runs 100% in your browser.

Count words, characters, sentences, and paragraphs in any text. See real-time reading time and SEO stats. Free, private, runs 100% in your browser.

Find and replace text across multiple lines instantly. Supports case-sensitive matching and whole-word mode. Free, private, runs 100% in your browser.

Format, minify, and validate JSON data instantly. Pretty-print JSON with customizable indentation. Free, private, runs 100% in your browser.

Validate JSON syntax instantly and get detailed error messages with line numbers. Free, private, runs 100% in your browser.

Calculate the sum of a list of numbers instantly. Also shows count, average, min, and max. Free, private, runs 100% in your browser.

Generate secure random numbers within a custom range. Supports multiple numbers, duplicate control, and copy options. Free, private, runs 100% in your browser.

Convert between bytes, KB, MB, GB, TB, and PB instantly. Free, private, runs 100% in your browser.

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, and microseconds. Free, private, runs 100% in your browser.

Convert seconds to hours, minutes, and seconds instantly. Shows days, hours, minutes, and seconds breakdown. Free, private, runs 100% in your browser.

Convert time (HH:MM:SS) to decimal hours instantly. Great for payroll, invoicing, and timesheets. Free, private, runs 100% in your browser.

Convert hours to days and remaining hours instantly. Free, private, runs 100% in your browser.

Convert days to hours instantly. Free, private, runs 100% in your browser.

Check if any year is a leap year instantly. Supports batch checking multiple years at once. Free, private, runs 100% in your browser.

Find out what day of the week any date falls on. Supports batch date lookup. Free, private, runs 100% in your browser.

Calculate the difference between two dates in days, hours, minutes, seconds, and months. Free, private, runs 100% in your browser.

Sort a list of items alphabetically, numerically, or by length. Supports ascending and descending order. Free, private, runs 100% in your browser.

Reverse the order of a list of items instantly. Free, private, runs 100% in your browser.

Randomly shuffle a list of items. Great for drawing lots, randomizing order, and more. Free, private, runs 100% in your browser.

Extract unique values from a list by removing duplicates. Supports case-insensitive mode. Free, private, runs 100% in your browser.

Find and display duplicate items in a list, with occurrence counts. Free, private, runs 100% in your browser.

Unwrap and join wrapped lines in a list. Removes bullet prefixes and combines broken lines. Free, private, runs 100% in your browser.

Add bullet points, dashes, asterisks, or numbers to each line of a list. Free, private, runs 100% in your browser.

Convert CSV data to JSON format instantly. Supports quoted fields, commas within values, and headers. Free, private, runs 100% in your browser.