Delim Converter

Convert lists between comma, pipe, tab, and custom delimiters with advanced options.

Input 0 items

Output 0 items

⚙️ Settings

Tidy Up Remove newlines

Attack clones Remove duplicates

Explode

Quotes

None Double " " Single ' '

Delimiter

Duplicate Remover — Remove Duplicate Lines from a List Online

The Duplicate Remover strips repeated lines from any list while keeping the remaining entries in their original order, with optional sorting afterward. It's built for analysts and developers who need to remove duplicate lines from a list — cleaning an email list before a campaign, deduplicating tags pulled from a CSV export, or tidying up a list of IDs before a database import. Paste your list, click a button, and get a clean, unique result instantly.

⚡ Key Takeaways

Removes repeated lines while preserving the original order of first occurrence.
Comparison is exact — case and whitespace differences count as "different" values.
Optional alphabetical or length-based sort after deduplication.
A quick first step before any bulk email send or database import.

What, Who, When & Why

What it's for	Removes duplicate lines from a list while keeping the rest in their original order.
Who it's for	Analysts and marketers cleaning email lists, tag lists, or exported data before importing it somewhere else.
When to use it	Before importing a list into another system, sending a campaign, or running a bulk operation where duplicates would cause repeated actions.
Why it's needed	Duplicate entries silently cause double-sends, inflated counts, or wasted processing — and manually spotting duplicates in a long list is impractical.
Best way to use it	Normalize capitalization and trim whitespace first if your list might have near-duplicates, since matching is exact and case-sensitive.

How to Use the Duplicate Remover

Paste your list into the Input box, one value per line.
Click Remove Duplicates to strip repeated lines, keeping only the first occurrence of each.
Optionally sort the result alphabetically or by line length using the additional sort buttons.
Click Copy to grab the deduplicated list.

Example

Given a list of email addresses collected from multiple sign-up forms:

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

After removing duplicates, only the unique entries remain, in their original order:

[email protected]
[email protected]
[email protected]

This kind of duplication is extremely common when merging sign-up lists from multiple sources, or when the same customer appears more than once across combined exports — deduplicating before use avoids sending duplicate emails or double-counting in a report.

Key Features

Removes duplicate lines while preserving the original order of first occurrence.
Optional alphabetical sort (A→Z or Z→A) after deduplication.
Optional sort by line length for organizing by size.
Works on any list length, updating instantly.
One-click copy of the cleaned result.

Practical Use Cases

Cleaning email lists: remove duplicate addresses before importing into an email marketing tool, avoiding duplicate sends.
Deduplicating tags or categories: clean up a list of keywords pulled from multiple sources.
Preparing unique ID lists: ensure a list of customer or order IDs contains no repeats before a bulk database operation.
Merging lists from multiple files: combine several exports and remove the overlap between them.
Auditing for accidental duplication: quickly check whether a large list actually contains repeated entries before processing it further.

Tips for Best Results

Normalize case and trim whitespace first if your duplicates might differ only by capitalization or stray spaces, since comparison is exact.
Combine multiple source lists into one input before deduplicating, rather than deduplicating each file separately.
Sort by length after deduplicating as a quick way to spot unusually short or malformed entries that slipped through.

Related Terminology

Deduplication is the process of identifying and removing repeated entries from a dataset. This tool performs an exact match comparison, meaning two lines are only considered duplicates if they're identical character-for-character — differences in capitalization or trailing spaces will cause otherwise-identical lines to be treated as distinct.

Important Considerations

Because comparison is case-sensitive and whitespace-sensitive, "[email protected]" and "[email protected]" are treated as different values, as are lines with trailing spaces. If your list may have this kind of inconsistency, consider running it through the Whitespace Trimmer or Case Converter first to normalize it before deduplicating.

Related Tools

Need to sort your list without removing duplicates? Use the Alphabetical Sorter directly. If your data has inconsistent capitalization that's creating false "unique" values, normalize it first with the Case Converter. For turning a deduplicated list into a SQL clause, try the SQL Value Generator.

Frequently Asked Questions

How do I remove duplicate lines from a list?

Paste your list into the Input box and click Remove Duplicates — repeated lines are stripped out instantly, keeping the first occurrence of each unique value.

Does it keep the original order of my list?

Yes, by default the deduplicated list preserves the original order of first occurrence. You can additionally sort alphabetically or by length if needed.

Is duplicate detection case-sensitive?

Yes — "Example" and "example" are treated as different values. Normalize case first with the Case Converter if you need case-insensitive deduplication.

Can I sort the list after removing duplicates?

Yes, use the alphabetical or length-based sort buttons after deduplicating to organize the cleaned list.

Can I merge two separate lists and deduplicate them together?

Yes, paste both lists into the same Input box (combining them) before clicking Remove Duplicates, and any overlap between the two will be removed.

Number Extractor

Extract all integers, decimals, and percentages from text.

Input

Output

Character Counter

Count characters, words, and lines with detailed stats.

Input

Stats

Text Reverser

Reverse strings, words, or the order of lines.

Input

Output

Find & Replace

Bulk replace multiple strings at once — add as many find/replace conditions as you need.

Input

Output

Find & Replace Conditions

Prefix / Suffix Stamper

Add custom prefix and suffix to every line.

Input

Output

Whitespace Trimmer

Strip, collapse, or remove all whitespace. "Clean All" does both trim and collapse in one click.

Input

Output

Column Extractor

Extract specific columns from CSV/TSV data.

Input (CSV/TSV)

Output

Split by Chunk

Split a long string into fixed-width chunks.

Input

Output

Alphabetical Sorter

Sort lines A→Z, Z→A, or by line length.

Input

Output

Escape / Unescape

Escape to HTML entities or JSON strings, or unescape back.

Input

Output

Line Number Stamper

Add incremental line numbers (001, 002, 003...) to each row.

Input

Output

SQL Value Generator

Wrap each line in quotes and join → ('a','b','c')

Input

Output

Date Range Generator

Generate a list of dates between two dates with custom intervals.

Start Date

End Date

Interval

Format

Output

Epoch Converter

Convert Unix timestamps to human-readable dates and vice versa.

Unix Timestamp

Human Date

Result

SQL Formatter

Beautify or minify SQL queries with proper indentation.

Input SQL

Output

CASE Statement Builder

Build SQL CASE WHEN statements one condition at a time — no special syntax to remember.

Column / Expression

Conditions

Else (default value)

Generated SQL

Query Sanitizer

Strip comments, SET statements, and trailing semicolons from SQL.

Input SQL

Output

📌 Sticky Notes

Organize your thoughts, tasks, and ideas with drag-and-drop sticky notes.

📌

Click "+ Add Note" to create your first sticky note.

Text Comparator

Compare two texts and see the differences highlighted.

Text A

Text B

Ignore case Ignore whitespace

Differences

Click "Compare" to see differences highlighted.

Ready to compare

Text Statistics

Get detailed statistics about your text: words, characters, paragraphs, sentences, and more.

Input Text

📝 Words

🔤 Characters

📏 Characters (no spaces)

📄 Sentences

📑 Paragraphs

📃 Lines

📊 Avg word length

📊 Avg sentence length

Detailed Results

SQL Query Templates

Ready-to-use boilerplate for common query patterns — CTEs, joins, date rollups, window functions, and stored procedures. Click Copy and adapt the table/column names.

CTE

Basic CTE (Common Table Expression)

Break a query into a readable, reusable named block.

WITH recent_orders AS (
    SELECT
        customer_id,
        order_id,
        order_date,
        total_amount
    FROM orders
    WHERE order_date >= DATEADD(day, -30, GETDATE())
)
SELECT
    customer_id,
    COUNT(order_id)   AS order_count,
    SUM(total_amount) AS total_spent
FROM recent_orders
GROUP BY customer_id
ORDER BY total_spent DESC;

Recursive CTE (hierarchy / org chart)

Walk a parent-child tree, e.g. an employee/manager hierarchy.

WITH RECURSIVE employee_hierarchy AS (
    -- Anchor: top-level rows (no manager)
    SELECT
        employee_id,
        manager_id,
        employee_name,
        1 AS level
    FROM employees
    WHERE manager_id IS NULL

    UNION ALL

    -- Recursive: join children to their parent's result
    SELECT
        e.employee_id,
        e.manager_id,
        e.employee_name,
        eh.level + 1
    FROM employees e
    INNER JOIN employee_hierarchy eh
        ON e.manager_id = eh.employee_id
)
SELECT *
FROM employee_hierarchy
ORDER BY level, employee_name;
-- Note: SQL Server / Oracle: drop the RECURSIVE keyword (just WITH employee_hierarchy AS (...))

Joins

INNER / LEFT JOIN across multiple tables

Combine orders with customers and line items in one query.

SELECT
    o.order_id,
    c.customer_name,
    o.order_date,
    p.product_name,
    oi.quantity
FROM orders o
INNER JOIN customers c
    ON o.customer_id = c.customer_id
LEFT JOIN order_items oi
    ON o.order_id = oi.order_id
LEFT JOIN products p
    ON oi.product_id = p.product_id
WHERE o.order_date >= '2026-01-01'
ORDER BY o.order_date DESC;

GROUP BY / Dates

Monthly rollup with GROUP BY on a date

Aggregate a date column by month (swap the truncation line for your engine).

SELECT
    DATE_TRUNC('month', order_date) AS order_month,     -- PostgreSQL
    -- FORMAT(order_date, 'yyyy-MM')  AS order_month,    -- SQL Server
    -- DATE_FORMAT(order_date, '%Y-%m') AS order_month,  -- MySQL
    COUNT(*)          AS order_count,
    SUM(total_amount) AS revenue
FROM orders
GROUP BY DATE_TRUNC('month', order_date)
ORDER BY order_month;

Window Functions

ROW_NUMBER + running total

Rank each customer's orders and compute a running total.

SELECT
    customer_id,
    order_id,
    order_date,
    total_amount,
    ROW_NUMBER() OVER (
        PARTITION BY customer_id
        ORDER BY order_date DESC
    ) AS order_rank,
    SUM(total_amount) OVER (
        PARTITION BY customer_id
        ORDER BY order_date
        ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
    ) AS running_total
FROM orders;

Stored Procedures

Parameterized stored procedure

A basic proc with optional date-range filters (T-SQL syntax).

CREATE PROCEDURE GetCustomerOrders
    @CustomerId INT,
    @StartDate  DATE = NULL,
    @EndDate    DATE = NULL
AS
BEGIN
    SET NOCOUNT ON;

    SELECT
        order_id,
        order_date,
        total_amount
    FROM orders
    WHERE customer_id = @CustomerId
        AND (@StartDate IS NULL OR order_date >= @StartDate)
        AND (@EndDate   IS NULL OR order_date <= @EndDate)
    ORDER BY order_date DESC;
END;
-- Call it: EXEC GetCustomerOrders @CustomerId = 101, @StartDate = '2026-01-01';

Upsert / Merge

MERGE (upsert) from a staging table

Insert new rows and update matching ones in a single statement.

MERGE INTO customers AS target
USING staging_customers AS source
    ON target.customer_id = source.customer_id
WHEN MATCHED THEN
    UPDATE SET
        target.customer_name = source.customer_name,
        target.email         = source.email,
        target.updated_at    = GETDATE()
WHEN NOT MATCHED THEN
    INSERT (customer_id, customer_name, email, created_at)
    VALUES (source.customer_id, source.customer_name, source.email, GETDATE());

🎨 Color Picker & Converter

Pick a color (or type a value) and get HEX, RGB, HSL, HSV, and CMYK instantly — copy any format with one click.

HEX

#FACC15

RGB

rgb(250, 204, 21)

RGB Percent

rgb(98%, 80%, 8%)

HSL

hsl(46, 96%, 53%)

HSV / HSB

hsv(46, 92%, 98%)

CMYK

cmyk(0%, 18%, 92%, 2%)

CSV ⇄ JSON Converter

Paste CSV or JSON and convert between them. Handles quoted fields, embedded commas, and nested-safe escaping.

Input

Output

SQL Query Explainer

Paste a SQL query and get a plain-English, structured breakdown of what it does. Pattern-based — works fully offline, no AI involved.

SQL Query

Plain-English Breakdown

Unit Converter

Convert data sizes and time durations. Pick a category, enter a value, and see it converted to every other unit.

Tools for analysts, developers & QA engineers

33 free, browser-based utilities — text and list tools, SQL helpers, converters, and small productivity apps. Everything runs locally; nothing you type or paste is ever uploaded.

📊

For Analysts

Clean lists, build SQL fragments, and reshape data without opening a spreadsheet.

💻

For Developers

Format SQL, convert data formats, and handle everyday text and encoding tasks.

🧪

For QA Engineers

Generate test data, compare text output, and sanitize queries before sharing them.

⚙️ Settings

Duplicate Remover — Remove Duplicate Lines from a List Online

⚡ Key Takeaways

What, Who, When & Why

How to Use the Duplicate Remover

Example

Key Features

Practical Use Cases

Tips for Best Results

Related Terminology

Important Considerations

Related Tools

Frequently Asked Questions

How do I remove duplicate lines from a list?

Does it keep the original order of my list?

Is duplicate detection case-sensitive?

Can I sort the list after removing duplicates?

Can I merge two separate lists and deduplicate them together?

Archived Notes

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