1. Frame QR
Frame QR reserves a rectangular canvas area inside the symbol where an image or text can sit without relying on error correction to hide it. The surrounding data area still scans in standard readers. This differs from simply placing a logo on a standard QR code—consult our [error correction simulator](/error-correction-simulator) to understand how logos affect regular codes. For most branding needs, a standard QR from our [URL generator](/url-qr-code-generator) with appropriate error correction suffices.
2. SQRC
SQRC (Secured QR Code) stores two kinds of data in one symbol: public data readable by any [QR reader](/qr-scanner), and private data readable only by readers holding the right key. Typical uses are ticketing, membership cards, and internal inventory. Standard tools like our [vCard generator](/vcard-qr-code-generator) or [WiFi QR generator](/wifi-qr-code-generator) create fully public codes; SQRC requires specialized software.
3. Caveats
Both are Denso Wave technologies and are not part of the core ISO symbol definition, and implementation requires compatible generators and readers. For most businesses, a standard QR code at level H with a modest logo is simpler. Use our [QR size calculator](/qr-size-calculator) to plan dimensions, the [printed QR tester](/printed-qr-tester) to verify quality, and the [placement guide](/qr-placement-guide) for optimal positioning. For secure applications where controlled access matters, consider URL-based authentication with codes from our [bulk generator](/bulk-generator) rather than proprietary formats.
Putting this into practice
Start with the smallest real test you can run. Generate the code, print it at the exact size you plan to use, and scan it with two different phones in the lighting where it will live. Check that the destination page loads quickly on a mobile connection and that the call to action next to the code tells people what they will get. If anything feels slow or unclear, fix it before you print a full batch, because reprints cost more than a short test. Keep a note of the size, material, and placement that worked so the next batch starts from a proven setup.
Common mistakes to avoid
The most common mistakes are easy to avoid once you know them. Long payloads make modules tiny, low contrast makes edges hard to read, and text placed too close to the border eats the quiet zone the scanner needs. Covering a corner finder pattern with a logo or a sticker breaks detection entirely, and a code placed behind glare or on a curved surface fails even when the print is perfect. Review each of these points on a proof copy, and treat any failure as a reason to adjust the design rather than a reason to blame the scanner.
Quick checklist
- Keep the payload as short as practical so modules stay large.
- Keep dark modules on a light background with strong contrast.
- Leave a clear quiet zone on all four sides of the symbol.
- Test the printed code at the real viewing distance and lighting.
- Confirm the destination page loads fast on a phone.
- Recheck the code after any change to the link, design, or placement.
