---
title: List Unique / Dedupe Calculator
description: Remove duplicates from a list while preserving first-seen order.
---

# List Unique / Dedupe Calculator

Use this **calculator** to remove duplicates from a list and keep each value once. First-seen order is preserved.

Site: [https://setcalculators.com/list-unique.html](https://setcalculators.com/list-unique.html)

## Example

Input:

```
apples, berries, apples, lettuce, berries, peppers, lettuce
```

Unique output:

```
apples
berries
lettuce
peppers
```

## Notes

- Comparisons are **case-sensitive** (`Apple` ≠ `apple`).
- Later duplicates are dropped; the first occurrence is kept.
- Related to turning a list into a set without reordering by sort.

## Related

- [Sort & Reverse](https://setcalculators.com/list-sort.html)
- [Set Operations](https://setcalculators.com/)
- [All calculators](https://setcalculators.com/calculators.html)

## Discovery

- Catalog: `/calculators.md`
- OpenAPI: `/openapi.json`
- Auth: `/auth.md`