Why should I send an SVG file to the print shop instead of a PNG?

SVG files describe the code as shapes, so they scale to any printed size with sharp edges. PNG files are fixed pixel grids that turn blurry when enlarged on a press, which makes the code harder to scan.

What CMYK ink formula should be used for printing QR codes?

Set the dark modules to 100% K black (cyan 0, magenta 0, yellow 0, black 100) rather than a multi-ink rich black. One plate avoids registration shifts and reduces ink spread at the module edges. The printer sets the remaining ink and press settings for the paper, so confirm with a proof.

What DPI resolution is required for printed QR codes?

DPI alone does not determine QR print quality. Raster artwork needs enough pixels to reproduce each module sharply at the final size; vector artwork is resolution-independent but can still be printed badly. Confirm module dimensions, quiet zone, scaling, and output settings with the printer, then scan the proof.

Can I print QR codes on glossy paper or laminate?

QR codes can work on glossy or laminated material, but reflections may hide modules from a camera. Matte finishes are usually more forgiving. If gloss is required, test the final material at realistic angles and under direct lighting, and avoid folds, curves, or fixtures that create persistent glare.

Can I print a QR code in color?

Yes, if the dark modules keep strong contrast against a light background. Black on white is the safe baseline. Check brand colors with a contrast checker, then scan a proof on the real stock, because contrast values alone do not certify a scan.

Do I need a barcode verifier for a print run?

Not for most marketing prints. A phone proof scanned on several devices is the usual test. Verifiers grade symbols under ISO/IEC 15415 and matter for supply-chain or regulated labels, where a minimum grade may be part of the specification.

What should I send a print shop for stickers or labels?

Send a vector file (SVG, EPS or PDF) with the code in 100% K, a clear four-module margin and the final size stated. Ask for a proof on the actual label stock and varnish, and keep gloss or foil away from the code area.

Why does my QR code scan on screen but not on paper?

Common causes are blurry raster files, rich black misregistration, ink spread, glare from gloss, and a quiet zone cropped by the layout. Check each of them on the printed proof, and scan from the real distance on more than one phone.

QR Code Printing Guide: DPI, Formats & Pre-Press Handoff

To print a QR code that scans, give the printer a vector file (SVG, EPS or PDF), set the code in 100% black on the K plate only, keep a blank border at least four modules wide, and check a physical proof on the real paper. If you have to use a raster image, make it at least 300 DPI at the final printed size. Blurry edges and four-color "rich" black are two frequent reasons a code that scanned on screen fails on paper.

This guide covers file preparation, black ink, paper and finishes, the quiet zone, how professionals grade print quality, and a checklist to hand to your print shop. For how big to make the code, see the print size guide.

Why should you send a vector file instead of a PNG?

A vector file describes the code as shapes, so the printer can scale it to any size and the edges stay sharp. A PNG or JPG is a fixed grid of pixels, and enlarging it softens the module edges. Phone cameras find a code by detecting sharp contrast between neighboring modules, so blurry edges make decoding less reliable.

Original diagram: one module corner as a vector shape and as an enlarged raster image.

Format	Type	Scaling	For print	Use it for
SVG	Vector	No quality loss at any size	Preferred	Business cards, packaging, posters, signs
EPS or PDF/X-1a	Vector	No quality loss at any size	Standard pre-press formats	InDesign, Illustrator and QuarkXPress layouts
PNG	Raster	Pixelates when enlarged	Acceptable at 300 DPI or more, at the final size	Mockups, email signatures, office printing
JPG	Raster	Pixelates when enlarged	Not recommended, because compression blurs module corners	Avoid for print

Download your print files as SVG from the free QR code generator. Our article on SVG QR code benefits goes into the file format in more detail. A vector file can still print badly if the press, ink, or paper is wrong, which is why the next sections matter.

What resolution does a PNG need?

If a raster file is unavoidable, generate it at the final printed size and at least 300 DPI. Do not make a small screen-resolution image and stretch it in your layout software. The pixel count is the size in inches times the DPI:

Required pixels = physical size in inches × output DPI

Printed size	DPI	Calculation	Minimum pixels
0.8 × 0.8 in (business card)	300	0.8 × 300	240 × 240
1.5 × 1.5 in (flyer or menu)	300	1.5 × 300	450 × 450
4.0 × 4.0 in (counter stand)	300	4.0 × 300	1,200 × 1,200
12.0 × 12.0 in (wall poster)	150	12.0 × 150	1,800 × 1,800
36.0 × 36.0 in (large sign)	100	36.0 × 100	3,600 × 3,600

Large formats can use a lower DPI because they are viewed from farther away, but the module edges still need to be crisp. One more check: make the PNG so that each module is a whole number of pixels wide. A 25-module code in a 250-pixel image gives exactly 10 pixels per module, while a code scaled to 253 pixels forces some modules to be wider than others and blurs the edges.

Why use 100% K black instead of rich black?

Set the code's dark modules to 100% K (cyan 0, magenta 0, yellow 0, black 100). Rich black stacks several inks, and on a press the plates can sit slightly out of register, which shifts one color against another. Ink also spreads a little as it dries (dot gain). Both effects soften module corners and let ink creep into the white gaps. A single black plate has nothing to misalign with, so its edges stay clean.

A clean black square printed from one plate beside a square printed from several inks with colored fringes where the plates are slightly out of register. — Original diagram: why one black plate keeps module edges clean. The shift is exaggerated for the drawing.

Black	Example values	Registration risk	Edge quality	Advice
Pure K black	C0 M0 Y0 K100	None, because one plate prints it	Crisp	Use for all printed codes
Rich black	For example C40 M30 Y30 K100	Higher, since four plates must line up	Softer, with more spread	Avoid for QR codes
Cool black	For example C60 M0 Y0 K100	Moderate, with two plates	Slightly softer	Avoid for small codes

Colored codes can work, but the dark modules still need strong contrast against the light background. Check any brand-color pair with the contrast checker and read the QR code color guide first. A contrast ratio screens out weak pairs and does not certify a scan, so the proof still decides.

What paper and finish work best?

Glossy coatings and reflective laminates cause glare under spotlights and camera flashes, which washes out contrast. Matte, silk or uncoated stocks, and matte lamination over the code, avoid the problem. Guides from several QR vendors give the same advice: gloss is riskier, and a matte finish is the more forgiving choice. If you must use gloss, test under the lighting where the code will hang.

Two side views of a light and a phone camera over a printed code: on glossy stock the light bounces straight into the camera as a glare patch, on matte stock the light scatters. — Original diagram: how a glossy surface can send a glare patch into the camera while matte stock scatters light.

Business cards and postcards. A stiff, matte card resists curling, which would distort the code when it is scanned at an angle. See the business card QR code guide.
Menus and table tents. Synthetic waterproof paper or a matte laminate works better than gloss. Ask the printer for a matte film.
Outdoor signs. Use a substrate and overcoat the supplier rates for outdoor sun exposure, and ask them for their expected lifespan in your climate.
Packaging and labels. Keep foil, hot stamping and gloss varnish away from the code. A matte varnish over the code area is the safer choice. The labels and bottles guide and the packaging guide go further, including curved surfaces.

How wide is the quiet zone?

ISO/IEC 18004 specifies a blank margin, the quiet zone, at least four modules wide on every side of the code. DENSO WAVE, the inventor of QR code, states the same four-module requirement. Text, artwork, borders, background patterns and fold or die-cut lines inside that margin can stop a scanner from finding the corner squares.

For example, a standard Version 2 code (25 × 25 modules) printed 1.0 in wide has modules 0.04 in across, so each side needs at least 0.16 in (about 4 mm) of clear space. Do not crop the margin to make the code fit a smaller frame. Shrink the code or enlarge the frame. Frames with dark panels are the most common offender, which our QR code frame test measured across 61 templates.

How is print quality graded professionally?

Barcode verifiers grade a printed symbol against ISO/IEC 15415, the standard for 2D symbols. According to vendor documentation, a symbol that cannot be decoded gets the lowest grade, F, and a decodable one is graded on parameters such as symbol contrast, modulation, reflectance margin, fixed pattern damage, and unused error correction, with grades running from A (4.0) down to F (0.0). Cognex describes the overall grade as the lowest of the parameter grades, while another vendor describes a weighted combination, so check the standard itself if a contract depends on it.

Two practical points follow. First, a verifier needs controlled lighting and a calibrated setup, so it is a tool for production and compliance, and your phone remains the right everyday test. Second, a good grade measures print quality and says nothing about whether the encoded link is correct. GS1 applications set minimum grades of their own, so a supply-chain label has more demanding acceptance rules than a poster. Ask your printer whether they can verify codes, and read error correction levels to see why spare correction capacity is one of the graded measures.

What should you hand to the printer?

Seven numbered checks: vector file placed, separations check for black only, four-module border measured, size against scan distance, contrast check, hard-copy proof on real paper, and scanning the proof on several phones. — Original diagram: the checks to finish before the file leaves your desk.

Place the code as a vector (SVG, EPS or PDF/X-1a) in your layout software, such as InDesign, Illustrator or CorelDRAW.
Open the separations preview and confirm that only the black plate has ink in the code's modules.
Measure the four-module blank border around the whole code.
Check the size against the scanning distance in our print size guide.
Check contrast. Black on white is the safe baseline.
Ask for a hard-copy proof on the actual paper, and scan it with several phones under dim indoor lighting before you approve the press run.

What does a typical printing mistake look like?

Think of a café that sends a flyer to a print shop with the QR code pasted in as a screenshot. The designer enlarged it to fit the layout, and the file uses a rich black with a gloss varnish across the whole sheet. On the office monitor the code scans perfectly. On the 2,000 printed flyers the edges look soft, the varnish throws a bright band under the café's spotlights, and about half of the people who try have to tilt the flyer. Nothing about the link was wrong.

The fix is an order of operations. Replace the screenshot with an SVG, set the modules to 100% K, mask the varnish off the code area, and ask for a single proof on the real stock before the run. The flyers and brochures guide shows how that layout works for a campaign.

Rollout checklist for a print run

The payload is final. Printed static codes cannot be edited, so decide whether a dynamic code fits a design that must stay live for months (see static vs dynamic).
The file is vector, or a raster made at final size and 300 DPI.
The modules are 100% K, and the background is light and plain.
The four-module quiet zone is clear of text, borders, folds and die lines.
The finish over the code is matte, or you have tested gloss under real light.
One proof was scanned on at least two phone models, one of them older.

What this checklist cannot settle

Some questions a checklist cannot settle. Presses and papers behave differently, so the printer's proof beats any generic rule here, and the module size a given press can hold depends on the stock and the process. Industry applications such as retail, pharmaceutical or logistics labels may impose their own grades and sizes, and those rules override this general guidance. Check what applies to your product and region. This guide is general information, not engineering advice.