QR Code Readability Checker

The QRLynx readability checker first tries to decode a QR image, then gives estimated design feedback from sampled colors, a possible center logo and the decoded content. Use it to inspect the encoded content and choose what to test next. It does not certify a QR or measure how often phones will scan it.

The score combines sampled color contrast and content-based density estimates with assumed design settings. It uses M-level error correction when no center logo is suspected, or L-level error correction when one is suspected. It assumes a classic module style and does not evaluate the actual logo size. These are scoring inputs, not measurements of the original QR. The tool does not measure physical size, scan distance, print DPI, finish or quiet-zone width.

A higher score means the sampled and assumed inputs received fewer penalties in this model. There is no score on this page that certifies print readiness. Read the individual feedback, confirm any assumptions in the original generator and scan a proof at its final size before approving a print run.

The checker samples a dark region near a finder pattern and a light region near the QR, then compares those colors. Check that the displayed color swatches resemble your design. A dark pattern on a light background is a useful starting point. Gradients, surrounding artwork, transparency and glare can make the sample unrepresentative, so test the complete design on the intended surface.

The quiet zone is the clear margin around the QR pattern. DENSO WAVE specifies a four-module margin on every side for a standard QR Code. Keep text, borders and other artwork outside that space. This checker does not measure the margin, so inspect it in the original design and the final print layout.

This checker cannot establish a safe logo size for your QR. It looks for unusual colors in a small center sample, which can miss a logo or mistake colored modules for one. It does not measure or score the actual logo area, so the result provides no safe coverage limit. Keep logos clear of the corner finder patterns, compare versions with and without the logo, and test the final design. See the QR with logo tutorial for the design workflow.

No. This tool uses an assumed level to calculate its design score; it does not report the symbol's actual error correction level. Check the setting in the generator that created the QR. Higher correction adds redundancy, but its recovery percentage is not a safe logo-coverage percentage. The error correction guide explains the levels and how to select a supported level in QRLynx.

No. An uploaded image does not tell the tool how the finished material will reflect light or bend the QR pattern. Scan a physical proof on the intended material under the lighting and viewing angles people will use. If glare or a curve prevents scanning, change the placement or finish and test again.

No. It does not receive the intended print size, scan distance or printer settings. Inspect the exported file and ask your printer to preserve crisp modules and the clear margin. Test a proof at the final size and expected viewing distance; a readable image on a screen does not establish that the printed version is large or sharp enough.

Yes. Upload the final QR image to check its decoded content and review the estimated design feedback. Then put it in the card layout without cropping its clear margin and print a proof at the intended size. Scan that proof on several phones and confirm the destination before ordering the full batch.

No. A score appears only after this browser decoder reads the image successfully. A low score means the model flagged sampled or assumed design inputs. A high score also cannot guarantee camera or print performance. If the tool cannot decode the image, try the original export and test it with a phone before deciding whether the QR needs to be rebuilt.

No account or design settings are needed to run the checker. Select or drop a PNG, JPG, SVG or WebP image. File reading, decoding and pixel analysis happen in your browser; the checker does not upload the image to QRLynx servers. If you open the generator with a decoded web link, that link is passed to the generator for reuse.

Print a proof at the final size and on the intended material. Try several phones at the distance and angles your audience will use, including the expected bright or dim lighting. Confirm both scanning and the destination. If a situation repeatedly fails, adjust the design, placement or material and test another proof. This is a practical check, not a certified test protocol or a prediction of a success rate.