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

Tags

Interval newline every X

Interval Wrap

Wrap Whole Output Adds to the very start/end of the result — handy for ('a','b') or [a, b]

✓ Copied!

Case Converter

Switch between UPPER, lower, Title Case, and Sentence case.

Input

Output

Duplicate Line Remover

Remove duplicate lines, optionally sort alphabetically or by length.

Input

Output

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.

ER Diagram Designer — Design Database Schemas Online

The ER Diagram Designer lets you visually design database schemas — add tables, define columns with data types and PK/FK keys, and draw relationships between them — then export the result as a PNG. It's built for developers, analysts, and students who need to create an ER diagram online while planning a database structure, documenting an existing schema, or studying entity-relationship modeling, without installing dedicated database design software.

⚡ Key Takeaways

Visually models tables, typed columns, and PK/FK relationships between them.
Connects specific columns to each other, not just whole tables.
Twelve common SQL data types available directly from a dropdown per column.
A planning and documentation aid — it doesn't generate or run actual SQL DDL.

What, Who, When & Why

What it's for	A visual tool for designing database schemas — tables, typed columns, keys, and relationships between them.
Who it's for	Developers, analysts, and students planning or documenting a database structure.
When to use it	Before writing CREATE TABLE statements, or when documenting or teaching an existing schema's structure.
Why it's needed	Planning a schema in text or in your head makes relationships hard to visualize; a diagram makes table connections immediately clear.
Best way to use it	Mark primary and foreign keys as you go, and connect specific columns (not just whole tables) to precisely represent each relationship.

How to Use the ER Diagram Designer

Click Add Table to create a new table with starter columns.
Rename the table using its header, then add or edit columns with a name, data type, and PK/FK badges.
Drag a column's blue dot onto another column to draw a relationship line between them.
Click a relationship line to select it, then click 🗑 to delete it, or drag an endpoint to repoint it.
Drag a table's header to move it, or its corner handle to resize it.
Click 📸 to export the finished diagram as a PNG.

Available Column Data Types

Each column can be assigned a data type from a dropdown, including: INT, BIGINT, VARCHAR, TEXT, BOOLEAN, DATE, DATETIME, TIMESTAMP, FLOAT, DECIMAL, UUID, and JSON — covering the most common types used across relational database systems.

Example

A simple two-table schema might have a users table with columns id (INT, PK) and email (VARCHAR), and an orders table with id (INT, PK) and user_id (INT, FK). Dragging a connection from the users.id column to orders.user_id visually represents the one-to-many relationship between customers and their orders — exactly the kind of relationship a foreign key enforces in a real database.

Key Features

Add unlimited tables, each with editable names and columns.
Twelve common SQL data types available per column.
Primary Key (PK) and Foreign Key (FK) badges for each column.
Drag-to-connect relationships between specific columns, not just whole tables.
Repointable and deletable relationship lines.
Drag-to-reorder columns within a table.
Color-coded tables for visual organization.
Resizable tables and a full-screen expand mode.
Export the finished schema diagram as a PNG.
Auto-saves to your browser between visits.

Practical Use Cases

Planning a new database: sketch out tables and relationships before writing any CREATE TABLE statements.
Documenting an existing schema: visually map out how an existing database's tables relate to each other.
Teaching or learning database design: practice entity-relationship modeling concepts with a visual, hands-on tool.
Reviewing schema changes: sketch a proposed schema change to discuss with a team before implementation.

Related Terminology

An ER diagram (Entity-Relationship diagram) visually represents a database's tables (entities) and how they relate to one another. A Primary Key (PK) uniquely identifies each row in a table, while a Foreign Key (FK) is a column that references a primary key in another table, establishing a relationship between the two.

Important Considerations

This tool is a visual planning and documentation aid — it doesn't generate or execute actual SQL CREATE TABLE statements, and it doesn't validate that your relationships match real database constraints. Use it to plan and communicate a schema design, then write the actual DDL separately.

Related Tools

Once you've planned your schema, the SQL Query Templates can help you write the actual table-creation and query SQL. For more general-purpose diagramming beyond database schemas, try the Flow Planner.

Frequently Asked Questions

Does this tool generate actual SQL CREATE TABLE statements?

No, it's a visual planning and documentation tool — it helps you design and communicate a schema, but you'll write the actual SQL DDL separately based on your design.

How do I mark a column as a primary key?

Click the PK badge next to that column to toggle it on — the badge highlights to show the column is marked as a primary key.

Can I connect specific columns, not just entire tables?

Yes, drag from a specific column's connection dot to another specific column to draw a precise, column-level relationship line.

Can I export my ER diagram as an image?

Yes, click the 📸 export button to download the complete diagram, including all tables and relationships, as a PNG image.

Free • Browser-Based • No Sign-Up

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

Archived Notes

ER Diagram Designer — Design Database Schemas Online

⚡ Key Takeaways

What, Who, When & Why

How to Use the ER Diagram Designer

Available Column Data Types

Example

Key Features

Practical Use Cases

Related Terminology

Important Considerations

Related Tools

Frequently Asked Questions

Does this tool generate actual SQL CREATE TABLE statements?

How do I mark a column as a primary key?

Can I connect specific columns, not just entire tables?

Can I export my ER diagram as an image?

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