How Much Data Can a QR Code Hold? (Max Characters Explained)

A QR code can hold a surprising amount of information — but the maximum is not the same as what you should put in one. The more data you add, the denser the pattern becomes, and dense codes are harder to scan, especially when printed small.

This guide explains the real capacity limits from the QR code standard (ISO/IEC 18004), what changes them, and how much space common things like links, WiFi details and phone numbers actually use.

The short answer

The largest standard QR code (version 40, a grid of 177 × 177 squares) at the lowest error correction level (L) can hold up to:

Type of data	Maximum characters
Numbers only (0–9)	7,089
Alphanumeric (0–9, A–Z uppercase, space and $ % * + - . / :)	4,296
Bytes (any text, including lowercase and symbols)	2,953
Kanji (Japanese characters)	1,817

Those are absolute ceilings. In everyday use, most QR codes hold well under 100 characters, and that is a good thing.

Why the type of data matters

QR codes store data in different modes, and each mode packs characters differently:

Numeric mode stores digits very efficiently, so you get the most characters.
Alphanumeric mode supports only 45 characters: digits, uppercase letters, the space and a few symbols. Lowercase letters are not included.
Byte mode handles any text, including lowercase letters, punctuation and characters from other languages. Most links and messages end up here.
Kanji mode is a special mode for Japanese characters.

Because a typical web address contains lowercase letters, it is usually stored in byte mode. So for practical purposes, 2,953 bytes is the number most people care about.

Note that bytes are not always the same as characters. Plain English letters and digits take one byte each in UTF-8, but accented letters such as "é" take two, and emoji usually take four. A message with accents or emoji uses up capacity faster than its character count suggests.

Make a free QR code for a link, WiFi or contact card — generated in your browser.

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How error correction reduces capacity

Every QR code includes extra error correction data, so it can still be read if part of it is dirty, damaged or covered by a logo. There are four levels:

Level	Approximate damage it can recover from	Max bytes in version 40
L (Low)	about 7%	2,953
M (Medium)	about 15%	2,331
Q (Quartile)	about 25%	1,663
H (High)	about 30%	1,273

Higher levels trade capacity for toughness. At level H, the largest code holds well under half the data it could at level L. For more on choosing a level, see QR code error correction levels.

QR Studio uses level M by default and switches to H automatically when you add a logo, so the code can survive the covered center. That is one reason a code with a logo looks denser than the same link without one — see can a QR code have a logo?.

How QR code versions affect capacity

QR codes come in 40 sizes called versions. Version 1 is a grid of 21 × 21 squares (called modules), and every version after that adds 4 modules per side, up to 177 × 177 for version 40. A generator normally picks the smallest version that fits your data.

Here is how many bytes fit in a few versions, by error correction level:

Version	Grid size	L	M	Q	H
1	21 × 21	17	14	11	7
2	25 × 25	32	26	20	14
3	29 × 29	53	42	32	24
4	33 × 33	78	62	46	34
5	37 × 37	106	84	60	44
10	57 × 57	271	213	151	119
20	97 × 97	858	666	482	382
40	177 × 177	2,953	2,331	1,663	1,273

Notice how quickly the grid grows. A version 10 code has more than seven times as many modules as a version 1 code. If both are printed at the same physical size, each square in the version 10 code is much smaller, which makes it harder for a phone camera to read.

How much data do common QR codes actually need?

We ran a few typical examples through the same encoder QR Studio uses, at its default level M:

Content	Characters	Version at level M
Phone number: `tel:+15551234567`	16	2 (25 × 25)
Short link: `https://example.com/menu`	24	2 (25 × 25)
WiFi login with a medium-length name and password	53	4 (33 × 33)
Link with three UTM tracking tags	89	6 (41 × 41)

Even the longest example uses only a small fraction of the maximum. That is typical: links, WiFi details, contact phone numbers and short messages all fit easily. The question is rarely "will it fit?" but "will it scan easily at the size I am printing?"

Why less data is better

Just because you can fit 2,000 characters in a QR code does not mean you should. Packing in more data:

Shrinks the squares. At a fixed print size, more modules means smaller modules, and smaller modules need a closer, steadier scan.
Needs a bigger print. To keep the squares readable, a dense code has to be printed larger. Our QR code size for print and minimum QR code size guides explain how size and distance relate.
Is less forgiving. Glare, curved surfaces, low light and older phones all struggle more with dense codes. If a code is failing, too much data is one of the first things to check — see QR code not scanning?.

How to keep your QR code light

Link instead of embedding. Rather than putting a long paragraph, a full menu or a document into the code, put it on a web page and encode the link. See how to make a QR code for a PDF.
Shorten long URLs. Remove unnecessary parameters, or use a short link on a domain you control.
Be selective with tracking tags. UTM tags are useful, but each one adds characters. Our guide to QR code tracking shows how to keep them short.
Use a dynamic code for long or changing content. A dynamic QR code stores only a short redirect link. Learn the trade-offs in static vs dynamic QR codes.
Keep contact cards tidy. A vCard with many fields grows fast. Include the details people really need.

Frequently asked questions

What is the maximum number of characters in a QR code?

The largest standard QR code can hold up to 7,089 digits, 4,296 alphanumeric characters (uppercase only), or 2,953 bytes of general text, at the lowest error correction level.

How long can a URL in a QR code be?

Technically, up to about 2,953 characters of plain text. In practice, keep URLs as short as you can. A URL under about 50 characters makes a small, easy-to-scan code.

Can a QR code hold a file, image or video?

Not in any useful way. A QR code holds a few kilobytes of text at most. To share a file, image or video, upload it somewhere and encode the link to it.

Does adding a logo reduce how much data a QR code can hold?

Indirectly, yes. A logo needs higher error correction, and higher error correction leaves less room for data in each version, so the same content may need a bigger, denser code.

Why does my QR code look so dense?

Usually because it holds a lot of data, uses high error correction, or both. Shortening the content is the easiest way to make it simpler and easier to scan.