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For most Home Assistant installations, NFC is the better default for quick, discreet triggers at a fixed location; QR codes are the better choice when a control should be visible, easy to replace, or usable by guests. Both methods ultimately produce Home Assistant’s tag_scanned event, so the important security decision is what the automation is allowed to do after a scan. NFC requires a compatible phone or reader held within a few centimeters. QR codes require a camera, adequate light, and a code that is large and clean enough to resolve. Neither format proves who scanned it: identifiers can be copied or replayed. Use either for lights, scenes, music, or other low-risk actions, but add device, presence, time, or confirmation checks before controlling locks, garage doors, alarms, or cameras.
What do NFC tags and QR codes do in Home Assistant?
Home Assistant treats an NFC tag and a QR code as two ways to carry the same kind of tag link. The link follows the form https://www.home-assistant.io/tag/<tag id>. When the Companion app recognizes that link, it sends a tag_scanned event to Home Assistant. Your automation listens for that event and then performs the selected actions.
This means the code format does not determine the automation logic. You can use an NFC sticker on a bedside table, a QR label on a wall, or both, and have each trigger the same scene. The Tag integration creates a tag entity with a last-scanned time and the device ID that scanned it. Those details let you make the response depend on the scanning device rather than treating every scan as identical.
The practical distinction is the interaction. NFC is a proximity gesture: hold a compatible phone or reader near the tag. QR is a visual scan: point a camera at a printed or displayed pattern. NFC can disappear into an object, while QR is intentionally visible and easier for another person to understand.
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Both official Home Assistant mobile apps can read and write NFC tags. Some physical tags are read-only or permit only one write, so confirm that a tag is writable before recording a URL you may later need to change. QR codes need no NFC hardware; you encode the tag URL, print or display it, and put it where the intended users can see it.
Which is better for a smart-home automation: NFC or QR?
Choose NFC for personal, fixed-location actions where speed and discretion matter. Choose QR when visibility, guest access, or easy reprinting matters more than a one-tap proximity gesture.
| Decision factor | NFC | QR code |
|---|---|---|
| Interaction | Hold a compatible phone or reader near the tag. | Point a camera at a visible code. |
| Visibility | Can be hidden under a desk, inside a case, or on an object. | Must remain visible enough for the camera to recognize. |
| Setup | Write the Home Assistant URL to a writable NFC tag. | Generate an image containing the Home Assistant tag URL and print or display it. |
| Guest accessibility | Depends on NFC hardware, operating-system behavior, and the app flow. | Most camera-equipped phones can scan, subject to the app’s confirmation flow. |
| Physical wear | A hidden sticker or card avoids visual wear but can be damaged or become unreadable. | Paper or adhesive labels can fade, smudge, peel, or be covered. |
| Copyability | The identifier can be read, copied, and replayed. | A photograph or reproduction can copy the image and its identifier. |
| Best fit | Personal, quick actions at a known location. | Shared spaces, instructions, guest use, and easy replacement. |
There is no authoritative universal scan-success percentage or average cost that applies to every phone, tag, label, room, and lighting condition. Treat placement and testing as engineering choices rather than assuming one format is always more reliable.
Use NFC when the action is a private gesture
An NFC sticker under a nightstand can activate a bedtime scene without adding a conspicuous sign to the room. A tag on a speaker can start a music scene, and one inside a car can run a departure routine. The short operating distance also reduces accidental scans compared with a code that anyone can point a camera at from across a room.
That short range is not authentication. Someone who can access the tag can copy its identifier, and a malicious app or device may be able to replay a scan. Treat NFC as a convenient trigger, not as proof of identity.
Use QR when people need to see what to scan
A QR label works well on a utility-room panel, a guest-room instruction card, or a shared kitchen control. A visitor can understand that the label is intentional and use a camera without knowing where an invisible NFC inlay is hidden. Reprinting is also straightforward if a label is damaged or the physical layout changes.
QR performance depends on a clear visual path. Provide adequate light, keep the pattern clean and flat, and make it large enough for the phone’s camera to resolve from the intended standing position. Home Assistant documents QR support, but it does not publish a universal minimum size or scan distance; test the exact label, lighting, and phones in your home.
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How do I trigger Home Assistant with an NFC tag?
Use a writable NFC tag, write the Home Assistant tag URL with the Companion app, then create an automation that listens for the resulting tag event.
- Create or select a tag in Home Assistant. In the Home Assistant interface, open the Tags integration or the tag-creation flow and assign a clear name such as bedside_sleep or desk_focus. Decide whether the eventual action is low risk before you connect the tag to it.
- Obtain a writable tag. Writable NTAG215 stickers or cards are a natural fit for Home Assistant demonstrations and household automations. Do not assume every NFC product can be rewritten: some tags are read-only, and some permit only one write. If you expect to change the destination later, avoid locking the tag until the identifier is final.
- Open the Companion app’s NFC writing flow. Use the app to select the Home Assistant tag and write its URL to the physical tag. Keep the tag and phone still during the write, and wait for the app to confirm completion before moving it.
- Place the tag deliberately. Put it where a phone can be held within a few centimeters without touching the surface. Avoid locations that bend the sticker, place it directly against metal without a suitable spacer, or expose it to water and abrasion unless the tag is designed for that environment.
- Build the automation. Add a tag trigger for the selected tag, then define the action: lights, a scene, media playback, or another low-impact operation. Add conditions for the scanning device, time, presence, or another state when the result should not be universal.
- Test the complete phone-to-server path. Scan with every phone model and app version used by the household. Confirm that the event arrives, the correct tag entity records the scan, and the action behaves as intended when the phone is locked, unlocked, or in another app.
On Android, bringing a phone near a Home Assistant NFC tag can fire the event through the mobile app. On iOS, a background NFC scan normally presents a notification; the user taps that notification to open the app and send the event. That extra tap is part of the expected iPhone flow, not evidence that the tag was written incorrectly.
How can a QR code start a Home Assistant automation?
Create the Home Assistant tag first, encode its tag URL as a QR image, print a durable label, and scan it with the Companion app or a supported camera flow.
- Prepare the tag URL. Use the URL associated with the Home Assistant tag, in the form
https://www.home-assistant.io/tag/<tag id>. Keep the identifier stable; changing it means the printed code no longer points to the tag you configured. - Generate the QR image. Encode the complete URL without adding tracking parameters or changing its characters. Export a high-resolution image so the square modules remain sharp when printed.
- Choose the label material. Ordinary paper is suitable for a dry indoor location. For a garage, workshop, porch, or other exposed area, use printable or weather-resistant label stock and protect the printed surface from water, abrasion, and direct sunlight.
- Position the code. Mount it in the intended user’s line of sight, with enough light and an unobstructed camera view. Do not place it behind glossy plastic that creates glare or where a door, appliance, or furniture routinely blocks the pattern.
- Scan and authorize. Point the phone’s camera or the Home Assistant app at the code. Follow the notification or approval prompt that sends the tag scan to Home Assistant rather than assuming that recognizing the image has already run the automation.
- Apply the same conditions as an NFC trigger. Restrict the automation by device, time, presence, or a second confirmation when the action has consequences beyond convenience.
QR is often easier for guests because the trigger is self-explanatory and does not require them to know that an invisible inlay is present. It still depends on a compatible app flow and network path to Home Assistant, so test it with the exact phones visitors are likely to bring.
What iPhone and Android limitations should I expect?
Phone behavior is a major part of the choice. Android can react when the phone is brought near a Home Assistant NFC tag, while iOS background reading has specific device and screen-state requirements. QR avoids the NFC-radio requirement but shifts the burden to camera access, lighting, framing, and the app’s link-confirmation flow.
iPhone background NFC reading
Home Assistant identifies iPhone XS, iPhone XR, and iPhone 11 families and later as supporting background NFC tag reading. Apple describes NFC as communication between devices within a few centimeters and says background tag reading works on supported devices while the screen is illuminated.
Apple also lists situations in which background reading is unavailable or interrupted. These include an active NFC scanning sheet, Wallet or Apple Pay use, camera use, Airplane Mode, and a device that has been locked after a restart. In practical instructions, say “hold the phone near the tag” rather than requiring physical contact, then explain that the notification may need to be tapped.
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Android behavior
Android phones with NFC hardware can generally detect the tag when they are brought close to it, but manufacturers, lock-screen settings, and app versions can affect what the user sees. Confirm the result on each model instead of assuming that one Android phone represents every household device.
QR camera requirements
QR scanning requires a working camera, permission to use it, enough light, and a code that is not blurred, folded, dirty, or covered. A code that works at a desk may fail in a dim hallway or through reflective laminate. There is no published Home Assistant guarantee for a particular print size or distance, so choose dimensions from a real test at the intended location.
Are NFC tags safer than QR codes for smart-home controls?
No. NFC can be less conspicuous, but neither NFC nor QR is a reliable authorization factor by itself. A tag identifier can be copied or replayed, and a QR image can be photographed, duplicated, or shown on another screen.
Home Assistant’s security guidance summarizes the correct mental model: “A link is a request, not a command.” The companion app responds to a link or tag and can ask the user for approval before sending the scan. The code format does not remove the need to validate what happens next.
What changed in the 2026 mobile-app advisories?
Home Assistant security advisories published July 31, 2026 described high-severity vulnerabilities in both mobile platforms. Before iOS 2026.5.0 and Android 2026.5.3, an untrusted local caller could send an attacker-chosen tag ID through the logged-in app without user interaction. The advisories assign a CVSS 3.1 base score of 7.1.
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Update the iOS app to 2026.5.0 or later and the Android app to 2026.5.3 or later. Patched versions add explicit approval controls. Depending on the app and link path, the user can see choices such as Allow once and Allow always; choose the least persistent option that fits the household’s use.
Why high-impact actions need another condition
A tag-bound automation might unlock a door, open a garage, disarm an alarm, or toggle a camera. A copied identifier, a misplaced label, a compromised phone, or an unintended scan could then have physical or privacy consequences. Require an additional condition such as a specific scanning device, a person-present state, a narrow time window, or an in-app confirmation before permitting those actions.
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For lights, music, fans, and scenes, a single scan may be an acceptable convenience. For access control and safety systems, design the tag as one signal in a multi-condition rule rather than as the decision itself.
How should I design the automation after the scan?
Separate the trigger from the authorization logic. The tag event says that a particular identifier was presented; conditions decide whether that presentation is acceptable now.
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Low-risk convenience actions
- Turn on a lamp or a group of lights.
- Activate a scene such as movie, reading, or bedtime.
- Start or stop music in a designated room.
- Set a fan, thermostat preset, or other reversible comfort setting.
These can often run immediately, provided accidental activation is tolerable and the tag is placed where a scan is intentional.
Higher-risk actions
- Unlock a door or open a garage.
- Disarm an alarm or change an intrusion mode.
- Disable cameras or alter privacy-sensitive recording.
- Trigger equipment whose operation could cause injury or property damage.
For these, combine the tag trigger with conditions that narrow who, where, and when. A device-ID condition can limit the automation to approved phones. Presence can require that the expected person is home. A time condition can prevent a bedside tag from opening a garage overnight. A second confirmation can force the user to approve the sensitive action after the scan.
Use the scanning device information
Each tag entity records the last-scanned time and the device ID that scanned it. That allows one physical code to behave differently for a household phone and an unknown device, or lets you log which approved device initiated a routine. A device ID is not the same as a verified human identity, so retain a second condition for consequential operations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What NFC tags and QR label materials should I buy?
For NFC, writable NTAG215 stickers or cards are the most natural general-purpose choice for Home Assistant projects. A Home Assistant tutorial uses NTAG215 stickers and round cards in NFC and QR automation demonstrations. Verify that a current listing is writable, has sufficient memory for the URL, and is compatible with the phones you will use before ordering.
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- Easy Application & Tips: To use, just write desired info with your phone, peel off the adhesive, and stick the NFC tag anywhere. Make sure your device supports NFC, keep it unlocked, and avoid sticking tags on metal to ensure smooth scanning and usage.
For QR, buy or print labels appropriate to the environment rather than selecting a brand on the assumption that all stock behaves alike. Indoor paper is inexpensive and easy to replace. Weather-resistant stock is preferable for locations exposed to moisture, dirt, sunlight, or frequent handling. Keep a digital copy of the QR image so a damaged label can be reproduced without rebuilding the automation.
Neither the official documentation nor the available security advisories establish a universal price, scan-distance guarantee, or battery-life advantage for one format. Compare the material, placement, phone compatibility, and replacement needs of your specific installation.
What can go wrong, and how do I fix it?
- The phone does nothing near an NFC tag. Confirm that NFC is supported and enabled on the device, that the tag was actually written, and that the phone is being held within a few centimeters. On iPhone, illuminate the screen and exit Camera, Wallet, Apple Pay, Airplane Mode, or an active NFC scanning sheet; a restart lock state can also block background reading.
- The iPhone shows a notification but the automation does not run. Tap the notification to open the app and send the event. Check that the Companion app is current and that its approval setting is not rejecting the link.
- The QR code is recognized but no action occurs. Follow the app’s confirmation prompt, then inspect the Home Assistant automation trace to verify that the tag trigger fired. A camera recognizing the URL is not the same as Home Assistant accepting the scan.
- The QR code scans only from some angles. Improve lighting, clean the label, flatten folds, remove glare-producing covers, and enlarge or reprint the code at higher resolution. Test from the distance at which users will stand.
- A tag works on one phone but not another. Compare operating-system version, Companion app version, NFC hardware, lock-screen state, and permissions. Test every model used in the home and document the expected interaction for each platform.
- The wrong automation runs. Check that the physical tag or QR image contains the intended identifier and that no other automation listens for the same tag. Rename tags clearly and disable obsolete automations after replacing a label.
- A sensitive action runs too easily. Treat the identifier as replayable. Add scanning-device, presence, time, and confirmation conditions, and update mobile apps to the fixed versions before continuing to use the control.
Which format fits common rooms and routines?
| Situation | Recommended format | Reason |
|---|---|---|
| Personal bedside bedtime scene | NFC | Discreet placement and a quick proximity gesture suit a private, fixed location. |
| Guest-room lighting instructions | QR | A visible label explains itself and does not require guests to know where an NFC inlay is hidden. |
| Shared kitchen music control | QR or NFC | Choose QR for discoverability; choose NFC if regular users prefer a hidden, fast gesture. |
| Outdoor or workshop label | QR with durable stock, or protected NFC | Material and weather protection matter more than the code type. Test readability after installation. |
| Garage-door or lock control | Neither by itself | Use the tag only as one trigger and require additional authorization conditions. |
Using both formats can be sensible. Put a visible QR label where guests need guidance and an NFC tag in the same area for household members who want a faster gesture. Point both to separate tag identifiers if you need to distinguish the two interaction paths in logs or conditions.
What should I test before relying on a tag?
- Scan in the exact location, lighting, and orientation where the tag will be installed.
- Test locked and unlocked phones, illuminated and dim screens, and any state in which users normally carry the device.
- Verify the event, tag entity, scanning device ID, and automation trace in Home Assistant.
- Try an unapproved phone or an unexpected time to ensure sensitive conditions reject the request.
- Repeat after updating the Companion app, changing the label, or moving the tag.
- Record a recovery procedure: where the automation is configured, how to disable it, and how to replace a damaged tag or label.
This test plan catches the failures that a simple “it scanned once” check misses: iOS state restrictions, camera glare, app approval prompts, copied identifiers, and conditions that accidentally allow the wrong device or time.
Frequently Asked Questions
Can one Home Assistant tag trigger different actions for different people?
Yes, an automation can use the scanning device ID recorded with the tag event as a condition and branch to different actions. That identifies the phone or tablet that scanned, not a guaranteed human identity, so do not use it alone to authorize access-control actions.
Can I rewrite an NFC tag after I install it?
Only if the physical tag remains writable. Some tags are read-only or allow a single write; test the URL first and avoid permanently locking the tag until the identifier and automation are final.
Does scanning a QR image automatically run the automation?
No. The camera or app first recognizes the Home Assistant link, and the Companion app may present a notification or approval prompt before sending the tag scan. The automation runs only after Home Assistant receives the resulting event and its conditions pass.
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Background reading requires a supported iPhone, an illuminated screen, and a suitable device state. Camera use, Wallet or Apple Pay, Airplane Mode, an active NFC scanning sheet, or a phone locked after restart can prevent background reading.
What should I do if a QR label is damaged?
Keep the original QR image and reprint it on stock suited to the location. If the underlying tag identifier has not changed, replacing the physical label does not require rebuilding the Home Assistant automation.
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