What does the error-correction level on a QR code do?

It adds redundant data so the code still scans when part of it is dirty, damaged or covered. The four levels in ISO/IEC 18004 recover about 7% (L), 15% (M), 25% (Q) or 30% (H) of the code; higher levels make the code denser for the same content.

How much text can a QR code hold?

Up to 4,296 alphanumeric or 2,953 bytes of text at the lowest error-correction level in the largest version (177 by 177 modules). Short payloads scan more reliably, so keep URLs brief.

Should I download the QR code as PNG or SVG?

Use SVG for print and anything that will be resized, because it is vector and stays sharp at any size. Use PNG where a raster image is required, such as a website or a document that does not accept SVG.

Does a Wi-Fi QR code expose my password?

Yes. The password is stored in plain text inside the code (WIFI:T:WPA;S:name;P:password;;), so anyone who scans or decodes it can read it. Only share the code with people you would give the password to.

QR Code Generator

QR codes for text, links, Wi-Fi and contacts.

About QR Code Generator

A QR code generator for a URL, text, vCard, email, SMS, Wi-Fi login, phone number, WhatsApp message or calendar event, downloaded as PNG or SVG.

How to use

Pick the payload type from the menu: Website URL, Plain text, Contact (vCard), Email, SMS, Wi-Fi, Phone number, WhatsApp message or Calendar event.
Fill in the fields. The code renders as you type, and the exact string it encodes is shown under "Encoded payload" with a Copy button.
Set the size, error-correction level and colours.
Download PNG or Download SVG.

Options

Size: 100 to 1000 px, default 300. The SVG scales without loss at any size.
Error correction: L (7%), M (15%, default), Q (25%) or H (30%). The percentage is how much of the code can be damaged or covered and still scan.
Foreground and background: six-digit hex colours, default black on white. Keep strong contrast; scanners expect dark modules on a light background.
Quiet zone: one module on every side.
Payload formats: vCard 3.0 for contacts, mailto: for email, sms: with a ?body= query for SMS, tel: for phone, WIFI: for networks (WPA/WPA2, WEP or open, with a hidden-network flag; backslash, semicolon, comma, colon and double quote in the name or password are escaped), https://wa.me/ for WhatsApp, and a VEVENT block for events with times in UTC.

The tool does not shorten links, track scans or add a logo.

Example

Type: Wi-Fi · SSID: Home · Password: secret · Security: WPA/WPA2
→ WIFI:T:WPA;S:Home;P:secret;;

Privacy

The code is drawn in the browser with the qrcode library. No request is made, and nothing is stored.

Frequently asked questions

What does the error-correction level on a QR code do?: It adds redundant data so the code still scans when part of it is dirty, damaged or covered. The four levels in ISO/IEC 18004 recover about 7% (L), 15% (M), 25% (Q) or 30% (H) of the code; higher levels make the code denser for the same content.
How much text can a QR code hold?: Up to 4,296 alphanumeric or 2,953 bytes of text at the lowest error-correction level in the largest version (177 by 177 modules). Short payloads scan more reliably, so keep URLs brief.
Should I download the QR code as PNG or SVG?: Use SVG for print and anything that will be resized, because it is vector and stays sharp at any size. Use PNG where a raster image is required, such as a website or a document that does not accept SVG.
Does a Wi-Fi QR code expose my password?: Yes. The password is stored in plain text inside the code (WIFI:T:WPA;S:name;P:password;;), so anyone who scans or decodes it can read it. Only share the code with people you would give the password to.

Encode & decode

GUID Generator: One or many UUIDs, version 4 or 7.
ULID Generator: Sortable 26-character IDs with a time prefix.
Password Generator: Random passwords with length and character-set controls.
Hash Generator: MD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC for text or a file.
Base64 Encoder / Decoder: Base64, Base32 and Base58 in both directions.
ROT13 / Caesar Cipher: Shift letters by any amount, or ROT13 in one click.
JWT Decoder: Read a token’s header and payload without sending it anywhere.
URL Encoder / Decoder: Percent-encode text for URLs, or decode it back.
HTML Entities: Escape &, < and > for HTML, or unescape them.
Base64 Image Encoder: Image to a Base64 data URL for CSS or HTML, or decode one back.
Random Number Generator: Random integers in a range, one or many, with or without repeats.
Bcrypt Generator: Hash a password with bcrypt, or check one against a hash.
AES Encrypt / Decrypt: Encrypt text with a passphrase using AES-256-GCM, or decrypt it.
Morse Code Translator: Text to dots and dashes, and back.

Data formats

XML ⇄ JSON: Convert between XML and JSON, from text or a file.
YAML ⇄ JSON: Convert between YAML and JSON, from text or a file.
CSV ⇄ JSON: Convert between CSV and JSON, from text or a file.
JSON to TypeScript: Infer TypeScript interfaces from a JSON sample.
JSON to Python Dataclass: Infer Python dataclasses from a JSON sample.
JSON to Pydantic Model: Infer Pydantic models from a JSON sample.
JSON to Go Struct: Infer Go structs with json tags from a JSON sample.
JSON to Rust Struct: Infer Rust structs with serde derives from a JSON sample.
JSON to Kotlin: Infer Kotlin data classes from a JSON sample.
JSON to C# Class: Infer C# classes from a JSON sample.
Base Number Converter: Binary, octal, decimal, hex and any base up to 36.
Text ⇄ Binary / Hex: Text to binary, hex, octal or decimal, and back.
Unix ⇄ UTC: Epoch seconds or milliseconds to a readable date, and back.
Timezone Converter: Convert a time between cities, with DST handled.
Cron Converter: Describe a schedule in words and get the cron expression.
Cron Expression Parser: Explain a cron expression in words and list its next run times.
Days Between Dates: The exact time between two dates, in days, weeks, months and years.
Age Calculator: Exact age in years, months and days, and the next birthday.
Epoch Clock: The current Unix timestamp, live, in seconds and milliseconds.
CIDR / Subnet Calculator: Network, broadcast, mask and host count for an IPv4 CIDR block.
Chmod Calculator: File permissions as octal (755) or symbolic (rwxr-xr-x).

Units & measures

Angle: Degrees, radians, gradians and turns.
Area: Square metres, feet, acres and hectares.
Bits / Bytes: Bits, bytes and every prefix up to petabytes.
Energy: Joules, calories, kilowatt-hours and BTU.
Frequency: Hertz, kilohertz, megahertz and RPM.
Fuel Economy: Miles per gallon, km per litre and litres per 100 km.
Length: Metres, feet, miles, inches and nautical miles.
Power: Watts, kilowatts and horsepower.
Pressure: Pascals, bar, PSI and atmospheres.
Speed: km/h, mph, knots and metres per second.
Temperature: Celsius, Fahrenheit and Kelvin.
Time Unit: Seconds, minutes, hours, days and beyond.
Volume: Litres, gallons, pints and cubic metres.
Weight: Kilograms, pounds, ounces and stone.

Text & code

Lorem Ipsum Generator: Placeholder paragraphs, sentences or words.
Slug Generator: Turn a title into a URL-safe slug.
Text Compare: Diff by line, word or character, unified or side by side.
URL Parser: Break a URL into host, path, query and fragment.
JSON Formatter & Validator: Validate, pretty-print or minify JSON.
JSON Diff: Compare two JSON documents, ignoring key order and formatting.
JSONPath Tester: Query JSON with a JSONPath expression.
SQL Formatter: Format and indent SQL for any dialect.
JavaScript Beautifier: Format minified or messy JavaScript into readable code.
HTML Formatter: Indent and tidy HTML, or strip it down to one line.
XML Formatter: Pretty-print or minify XML, with error positions.
CSS Minifier / Beautifier: Minify CSS, or expand it back to readable rules.
HTML to Markdown: Convert HTML to clean Markdown.
Text Case Converter: camelCase, snake_case, kebab-case, Title Case and more.
Markdown Previewer: Render Markdown as you type.
Whitespace Remover: Strip line breaks, extra spaces or both.
Sort Lines: Sort lines alphabetically, numerically, by length or reversed.
Duplicate Line Remover: Keep each line once.
String Counter: Characters, words, lines and bytes.
Regex Tester: Test a pattern against text with live matches.
Regex Cheatsheet: Regular-expression syntax with examples.

Word play

Palindrome Checker: Does it read the same backwards?
String Reverser / Rotator: Reverse a string or rotate it by n characters.
Roman Numeral Converter: 1984 ⇄ MCMLXXXIV.
NATO Phonetic Alphabet: Spell text out as Alfa, Bravo, Charlie.
Pig Latin Converter: English to Pig Latin and back.
Numeronym Generator: internationalization → i18n.
Leetspeak Translator: Text to l33t and back.
Word Frequency Counter: Which words appear most, and how often.

Images & colour

QR Code Generator: QR codes for text, links, Wi-Fi and contacts.
Barcode Generator: EAN, UPC, Code 128 and more as SVG or PNG.
Barcode / QR Reader: Decode a barcode or QR code from an image.
Color Picker: Pick a colour and copy it in every format.
Image Converter: Convert between PNG, JPEG and WebP, and resize on the way.
Contrast Checker: Contrast ratio of text on a background, against WCAG AA and AAA.
Favicon Generator: Every favicon size from one image.
Image Compressor: Shrink a JPEG, PNG or WebP in the browser.
Gradient Generator: Build a CSS gradient and copy the rule.
Box Shadow Generator: Tune a shadow and copy the CSS.

Reference

ASCII Table: Every ASCII character with its decimal, hex, octal, binary and HTML code.
HTTP Status Codes: Every HTTP status code with what it means and when to use it.
MIME Types: Common MIME types by file extension, searchable.
Port Numbers: Well-known and registered TCP and UDP ports and the services behind them.