Randomize Lines
Shuffle and randomize your text lines in random order
Options
Input Text
One item per line
Randomized Output
Your shuffled text
Why Randomize and Shuffle Lines?
Randomizing text lines is essential for creating fair quizzes, conducting unbiased surveys, shuffling contest entries, and randomizing data for testing purposes. This free online line randomizer uses the Fisher-Yates shuffle algorithm to ensure truly random, unbiased ordering where every line has equal probability of appearing in any position. Whether you're a teacher creating randomized test questions, a developer generating test data, or a contest organizer picking winners, this tool provides cryptographically secure randomization.
Unlike simple sorting methods that can introduce bias, our randomizer ensures uniform distribution across all permutations. Perfect for shuffling to-do lists, randomizing participant order, creating random seating arrangements, or generating unpredictable sequences for games and experiments. Combine with Remove Duplicates to ensure unique entries before randomizing, or use Sort Lines to organize results alphabetically after selection.
Common Use Cases for Line Randomization
📚Education & Quiz Creation
Shuffle quiz questions to create unique test versions for each student, preventing cheating. Randomize multiple choice answer orders, flashcard decks for study sessions, and vocabulary lists for language learning.
Teachers use this to generate different exam versions and create fair seating charts.
🎁Contests & Giveaways
Randomly select contest winners from entry lists in a fair, transparent way. Perfect for social media giveaways, raffle drawings, door prize selections, and lottery number generation.
Ensures unbiased winner selection for competitions and promotions.
💻Development & Testing
Generate randomized test data for QA, shuffle database records for load testing, and create unpredictable sequences for unit tests.
Perfect for A/B testing participant assignment and generating mock data.
📋Lists & Organization
Randomize team assignments for group projects, shuffle presentation orders in meetings, or create random workout routines from exercise lists.
Use with Prefix & Suffix to add numbers after shuffling.
How the Line Randomizer Works
This tool implements the Fisher-Yates shuffle algorithm (also known as the Knuth shuffle), the gold standard for unbiased randomization. The algorithm works by iterating through the list backward, swapping each element with a randomly selected element from the remaining unprocessed elements. This ensures every permutation has exactly equal probability (1/n! for n items), eliminating bias present in naive sorting-based approaches.
When you paste text, the tool splits it into individual lines, optionally removes empty lines and duplicates based on your settings, then applies Fisher-Yates shuffling using JavaScript's Math.random() for the random number generation. The "Shuffle Again" button lets you re-randomize the same input multiple times without re-pasting.
All randomization happens locally in your browser with a 300ms debounce for performance optimization—your data never leaves your device, ensuring complete privacy. For best results, consider using Remove Duplicates first to eliminate duplicate entries.
Tips for Best Results
- 1.One item per line: Ensure each entry is on a separate line. The tool randomizes by line breaks, not by commas or other delimiters.
- 2.Remove duplicates first: Enable "Remove duplicate lines" to ensure each entry only appears once, or use Remove Duplicates as a preprocessing step.
- 3.Multiple shuffles: Click "Shuffle Again" to generate new random orders from the same input. Each click produces a different arrangement.
- 4.Contest fairness: For transparent giveaways, copy the randomized result, then take the top N entries as winners. Screenshot for proof of fair selection.
- 5.Combine with sorting: After selecting winners from a randomized list, use Sort Lines to alphabetize for easier lookup.