How do I resize a QR code online for free?

Upload your existing QR code image to QR Sizer, wait a moment for it to be decoded, choose your desired size (up to 2048 pixels) and format (PNG or SVG), and click Download. The whole process is 100% free, requires no signup, and completes in under 30 seconds.

Is QR Sizer really free?

Yes — QR Sizer is completely free with no ads, no watermarks, no signup, and no usage limits.

Can I make a blurry QR code sharp again?

Yes. QR Sizer decodes the QR content and regenerates a brand-new, mathematically perfect QR code at whatever resolution you choose, so a blurry screenshot can become a razor-sharp 2048×2048 pixel print-ready image.

Is my QR code data uploaded to a server?

No. Everything — decoding, type detection, and regeneration — happens locally in your browser. Your QR image and its decoded content never leave your device.

What image formats can I upload?

You can upload PNG, JPG, or JPEG images up to 10 MB.

PNG or SVG — which format should I choose?

Choose PNG for social media, websites, screens, and most printing needs. Choose SVG when you need infinite scalability without any quality loss — ideal for large banners, packaging, and business cards.

What sizes can I export?

Two categories: Digital (256, 512, 1024, or 2048 pixels for screens, social media, and websites) and Print (2, 2.5, 3, 4, or 5 cm at 300 DPI for business cards, product labels, stickers and print media). Export as SVG for unlimited scaling.

What is the smallest scannable QR code size?

The generally accepted minimum is 2 x 2 cm (0.8 x 0.8 inches) when scanned from about 20 cm away. QR Sizer lets you regenerate at exact print sizes — 2 cm, 2.5 cm, 3 cm, 4 cm and 5 cm — at 300 DPI so the printed code stays crisp and scannable.

How do I make a QR code the right size for a business card?

Pick 2 x 2 cm or 2.5 x 2.5 cm from the size selector. QR Sizer generates the QR at 300 DPI which prints sharply at business-card size. For zero pixelation at any size, choose SVG format.

What DPI should a QR code be printed at?

Aim for at least 300 DPI. QR Sizer’s print sizes are pre-calculated at 300 DPI so you can drop them into any print layout without doing the math yourself.

What is the minimum size for a QR code to scan reliably?

The generally accepted minimum is 2 × 2 cm (0.8 × 0.8 inches) when scanned from about 20 cm away. For longer scanning distances, apply the 10:1 rule — the QR code width should be at least 1/10 of the scanning distance.

What is the 10:1 rule for QR codes?

The 10:1 rule means the QR code should be printed at least 1/10 the size of the maximum scanning distance. For example, if people will scan from 2 meters away, the QR should be at least 20 cm wide. If from 50 meters (a billboard), at least 5 meters wide.

What size QR code should I use on a business card?

For business cards, use a QR code 2 × 2 cm (0.8 × 0.8 inches), rendered at 240 × 240 pixels at 300 DPI. Keep a clear quiet zone around the code and ensure high contrast between the modules and the background.

What size QR code for a billboard?

Billboards are typically scanned from 10 – 50 meters away. By the 10:1 rule, the QR code should be 1 × 1 meter to 5 × 5 meters wide. Always export as scalable SVG to keep the image sharp at any print size.

What DPI should a QR code be printed at?

Use 300 DPI for standard print (business cards, flyers, menus, product packaging). Use 600 DPI for high-end print like magazines and premium brochures. For digital screens, 72 to 96 DPI is enough.

How do I convert QR code physical size to pixels?

Multiply the desired size (in inches) by the DPI. For example, a 2-inch QR code at 300 DPI needs 2 × 300 = 600 pixels. A 2 × 2 cm QR at 300 DPI needs about 240 pixels (2 cm ≈ 0.787 inches × 300 ≈ 236 px).

Should I use PNG or SVG for printed QR codes?

Use SVG whenever possible for print — it is a vector format that scales infinitely without pixelation. PNG is fine for digital and small print at known sizes. For billboards, product packaging, and anywhere the QR may be enlarged, always export as SVG.

QR Sizer

Create · Optimise · Share

Reference guide · 12 use cases

QR Code Size Guide — Perfect Dimensions for Every Use Case

How big should a QR code be? Exact pixels, centimeters, inches and DPI for business cards, flyers, posters, billboards, product packaging, restaurant menus and more.

10:1

The 10:1 distance-to-size rule

A QR code should be at least 1/10 the size of the farthest expected scanning distance. Example: if people will scan from 2 meters away, the QR must be at least 20 cm wide. From 50 m (billboard), at least 5 m.

12 common use cases & their ideal QR size

Business cards

Distance:: Few inches (close-up)
Size:: 2 × 2 cm (0.8 × 0.8")
Pixels:: 240 × 240 px @ 300 DPI

Tips

Ensure clear space around the code
Maintain high contrast
Avoid overcrowding the code with data

Product packaging & labels

Distance:: Few inches to arm’s length
Size:: 1 × 1 cm to 2 × 2 cm (0.4 – 0.8")
Pixels:: 120 × 120 to 240 × 240 px @ 300 DPI

Tips

Avoid reflective or curved surfaces
Use high print quality
Preserve a proper quiet zone around the code

Flyers, brochures & magazines

Distance:: Arm’s length (30–70 cm / 1–2.5 ft)
Size:: 2 × 2 cm to 3 × 3 cm (0.8–1.2")
Pixels:: 240 × 240 to 360 × 360 px @ 300 DPI

Tips

Avoid placing QR codes near folds or edges
Use high-resolution images for print
Include a clear call to action next to the code

Posters & indoor signage

Distance:: 1 – 3 meters (3 – 10 ft)
Size:: 10 × 10 cm to 30 × 30 cm (4 – 12")
Pixels:: 1200 × 1200 to 3600 × 3600 px @ 300 DPI

Tips

Place in visible, high-traffic areas
Maximize color contrast
Keep a wide quiet zone

Digital signage & presentations

Distance:: 1 – 6 meters (3 – 20 ft)
Size:: 5 × 5 cm to 60 × 60 cm on screen
Pixels:: At least 300 × 300 px for presentations

Tips

Use high pixel-density images
Ensure good contrast against background
Avoid cluttered or busy backgrounds

Billboards & outdoor advertising

Distance:: 10 – 50 meters (30 – 160 ft)
Size:: 1 × 1 m to 5 × 5 m (3.2 – 16 ft)
Pixels:: 500 × 500 px minimum (use SVG for print)

Tips

Follow the 10:1 distance-to-size rule
Use vector SVG format for print clarity
Mount signage at an accessible height

Event tickets

Distance:: Few inches (close-up)
Size:: Small to medium, depends on format
Pixels:: 256, 512, 1024, 2048 or 4K options

Tips

Ensure readability despite logos or custom color
Test thoroughly before deployment
Use error correction level H if adding a logo

Restaurant menus

Distance:: Few inches
Size:: 2 × 2 cm to 5 × 5 cm (0.8 – 2")
Pixels:: 240 × 240 px minimum @ 300 DPI

Tips

Use laminated cards sized 3.5" × 5" or 5" × 7"
Make sure guests can scan quickly and easily
Keep the destination URL short

Manufacturing labels

Distance:: Few inches
Size:: Varies — minimum 12 mm for simple codes
Pixels:: Varies — 150 px minimum

Tips

Support large data capacities (up to 3,000 characters)
Avoid blurry prints
Prioritize contrast for quick scanning

Educational materials

Distance:: Close-up to arm’s length
Size:: Varies by placement (handout vs wall poster)
Pixels:: 240 × 240 px @ 300 DPI for handouts

Tips

Use URL shorteners to reduce data complexity
Design for visibility based on environment
Pair with a short caption or CTA

Real estate signs

Distance:: Medium to long distance
Size:: 4.75" × 4.75" to 7.75" × 7.75"
Pixels:: 1425 × 1425 to 2325 × 2325 px @ 300 DPI

Tips

Apply decals to existing signage
Test for scannability at typical viewing distances
Ensure landing pages are mobile-optimized

Hospital patient wristbands

Distance:: Close-up
Size:: Small to medium, at least 2 cm wide
Pixels:: 240 × 240 px minimum @ 300 DPI

Tips

Ensure clear readability at all times
Prioritize patient safety and scanning reliability
Use high error correction level

DPI reference

Dots-Per-Inch controls how sharp your QR looks when printed. Convert from physical size to pixels: pixels = inches × DPI

72–96 DPI

Digital screens

Websites, emails, app screens, social media

300 DPI

Standard print

Business cards, flyers, menus, product labels

600 DPI

High-end print

Magazines, premium brochures, luxury packaging

8 common mistakes to avoid

Making the QR too small — stays under the 10:1 rule (scanning distance ÷ 10) means your 20 cm QR works up to 2 m away, not 20 m

Using low contrast — light-gray on white, or pale colors on busy photos won’t scan reliably

Removing the quiet zone — QR codes need ~2 modules of blank space around them (about 10% of the code width)

Inverting dark/light — most scanners expect dark modules on a light background; inverted codes can fail on older phones

Printing on reflective or curved surfaces without testing — glossy stickers, aluminum cans, and spherical packaging distort the pattern

Compressing or resizing the final image after export — always generate at the exact pixel size you need, or export as SVG for perfect scaling

Overcrowding with data — the more characters you encode, the denser the QR becomes and the larger it needs to be printed to scan

Skipping real-world testing — always scan from the actual intended distance with multiple phones before mass-printing

Ready to make a correctly-sized QR?

QR Sizer has print presets from 0.5" to 5 cm plus digital sizes up to 2048 px — pre-calculated at 300 DPI so you can skip the math.