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.

QR Code Generator — Create a Free QR Code Online

This QR Code Generator turns any URL or block of text into a scannable QR code, generated entirely in your browser — nothing is sent to a server. It's built for anyone who needs a free QR code generator for a business card, flyer, product label, or quick link-sharing, without signing up for an account or worrying about a third-party tracking service. Type your text or link, and download the result as a PNG.

⚡ Key Takeaways

Generates a scannable QR code entirely in your browser — nothing sent to a server.
Three error-correction levels trade off data capacity against damage resistance.
Supports roughly 100 characters, depending on the error-correction level chosen.
Always test-scan a code before finalizing print materials at their actual size.

What, Who, When & Why

What it's for	Generates a scannable QR code from any URL or text, entirely in your browser.
Who it's for	Anyone creating print materials, product labels, or quick links that need to be scanned by a phone.
When to use it	When you need a scannable link for a business card, flyer, packaging, or event material.
Why it's needed	Third-party QR generators often track scans or require signup; a client-side generator produces the code with nothing sent to a server.
Best way to use it	Test-scan the generated code with your own phone at the intended print size before finalizing any physical materials.

How to Use the QR Code Generator

Type or paste a URL or block of text into the input field.
Choose an error-correction level — Medium is a good default for most uses.
The QR code appears and updates automatically as you type.
Click Download PNG to save the QR code image to your device.

Understanding Error Correction Levels

QR codes include built-in error correction so they can still be scanned even if part of the code is damaged, dirty, or partially obscured (for example, by a logo placed in the center). This tool offers three levels:

Level	Recovery capacity	Best for
Low	Lowest — but fits more data	Longer text/URLs where space is tight
Medium	Balanced	General-purpose use (recommended default)
Quartile	Higher recovery	Codes that may get scuffed, printed small, or partially covered

Example

Typing https://dataflu.com generates a scannable QR code that, when scanned by any smartphone camera, opens that URL directly — no app required beyond the device's built-in camera on most modern phones. Switching the error-correction level from Medium to Quartile for the same URL produces a visually denser code that's more resistant to damage or partial obstruction, at the cost of slightly less room for longer text.

Error Correction Level — Relative Damage Recovery

Low

~7% recovery

Medium

~15% recovery

Quartile

~25% recovery

Key Features

Generates QR codes entirely client-side — no data is sent to any server.
Three selectable error-correction levels (Low, Medium, Quartile).
Live preview that updates as you type.
One-click PNG download at a sharp, print-ready resolution.
Works with both URLs and plain text.

Practical Use Cases

Business cards and flyers: generate a scannable link to a website or contact page for print materials.
Product packaging: link to a manual, support page, or product listing.
Quick link sharing: generate a QR code for a document or page link to share in a presentation or on a screen.
Event materials: link attendees directly to a registration form, agenda, or feedback survey.
Wi-Fi or contact sharing: encode plain text information for quick scanning, such as a short message or reference code.

Tips for Best Results

Use a URL shortener for long links if you're running into the character limit, since shorter text allows for higher error correction.
Choose Quartile error correction for anything that will be printed small or handled frequently, like a product label.
Test-scan your generated code with your own phone before finalizing print materials, especially at the actual size it will be printed.

Related Terminology

A QR code (Quick Response code) is a two-dimensional barcode that encodes text or a URL in a grid of black and white squares, readable by smartphone cameras and dedicated scanners. Error correction is built into the QR code standard using Reed-Solomon coding, which allows the code to remain scannable even with some damage or obstruction.

Important Considerations

This tool supports text up to roughly 100 characters, depending on the error-correction level chosen — higher error correction leaves less room for data. If your text is too long, try shortening it or using a URL shortener first. Very small printed QR codes can be harder to scan reliably, so consider a higher error-correction level for small or low-quality print applications.

Related Tools

Need to share a color scheme alongside your QR code design? Check the Color Picker. Building marketing or planning materials? The Flow Planner can help sketch out a layout or workflow before finalizing your design.

Frequently Asked Questions

Is this QR code generator really free?

Yes, it's completely free with no account required, and it runs entirely in your browser so there's no usage limit tied to a server.

How long can the text or URL be?

The tool supports up to roughly 100 characters depending on the error-correction level selected — shorter text allows for higher error correction.

Which error-correction level should I choose?

Medium is a good default for most uses. Choose Quartile if the code will be printed small or might get scuffed or partially covered, and Low if you need to fit more text and don't need extra damage resistance.

Is my data sent to a server when I generate a QR code?

No — the QR code is generated entirely by JavaScript running in your browser, so the text or URL you enter is never transmitted anywhere.

Should I test-scan my QR code before printing it?

Yes, it's good practice to scan the generated code with your own phone at the intended print size before finalizing any physical materials.

🧩 Flow Planner

Sketch out flows and diagrams with shapes and connectors. Double-click a shape to rename it, drag to move, and export the whole board as a PNG.

🗄️ ER Diagram Designer

Sketch database schemas visually — add tables, define columns with types and keys, and draw relationships between them. Export the finished diagram as a PNG.

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

QR Code Generator — Create a Free QR Code Online

⚡ Key Takeaways

What, Who, When & Why

How to Use the QR Code Generator

Understanding Error Correction Levels

Example

Key Features

Practical Use Cases

Tips for Best Results

Related Terminology

Important Considerations

Related Tools

Frequently Asked Questions

Is this QR code generator really free?

How long can the text or URL be?

Which error-correction level should I choose?

Is my data sent to a server when I generate a QR code?

Should I test-scan my QR code before printing it?

Tools for analysts, developers & QA engineers

For Analysts

For Developers

For QA Engineers

Core Tools

SQL Tools

Productivity

Analysis

Design