Best Offline QR Code Scanners for Every Device

Do You Actually Need to Install Anything?

Four questions, in order. Most readers stop at the first one, which is why this page does not open with a list of apps.

1. 1Are you scanning a code in front of you, on paper or a screen?Yes, and stop hereUse the camera you already haveiOS scans from the Camera app and from a Control Centre control. Android has scanned from the camera since version 9 on most phones. Windows has a Barcode mode in its Camera app. All three decode on the device, so all three work in airplane mode, and none of them needs a permission you have not already granted.
2. 2Is the code inside a screenshot or an image file?YesYou need something that reads files, not a cameraThis is the real gap, and it is where most people end up installing something. On Linux it is one zbarimg command. Everywhere else it is a gallery-aware app or a local web page, and the question that matters is whether your image leaves the machine.
3. 3Do you need a record of what you scanned?YesInstall a scanner with historyHistory, search, timestamps and CSV export are the honest reasons to install a dedicated app. Stocktaking, ticket doors, asset audits. If you are scanning one code a month, none of this applies to you.
4. 4Are you scanning retail or logistics barcodes too?YesYou need a multi-format scanner, not a QR scannerEAN, UPC, Code 128 and Data Matrix are different formats with different decoders. A QR-only scanner looks straight past them. This is the single biggest functional difference between scanner apps, and it is the one roundups bury under star ratings.

If you got to the bottom of that flow, an app is worth installing. If you stopped at question one, you already own the answer and installing something would only add a permissions dialog and an advertising SDK to a job your camera does for free.

What Each Device Can Already Read

Two columns matter here and roundups collapse them into one. Scanning a code in front of you is a camera problem. Reading a code out of a screenshot is a file problem. Several platforms are good at one and useless at the other.

Every claim below links to the vendor’s own documentation. Two of them we could not verify, and those say so rather than guessing, because a scanner guide that invents platform behaviour is worse than no guide.

• iPhone and iPad

  Scans with the cameraPoint the Camera app at a code in Photo mode and a link appears at the bottom of the screen. There is also a Scan Code control you can add to Control Centre, which skips straight to a scanner.

  Undocumented, test itApple documents camera scanning and the Control Centre control. It does not document decoding a code out of a saved screenshot, and behaviour there has moved between iOS versions. Test yours in five seconds: open a screenshot in Photos and long-press the code. If nothing happens, that route does not exist on your version and you need an app that reads files.

  Source: Apple, Scan a QR code with your iPhone camera

• Android

  Usually, depends on the phoneStandard since Android 9 on most phones, and many also carry a Quick Settings tile. It is the manufacturer's implementation rather than Google's, so it sits in Camera settings on Samsung, under More on OnePlus, and is missing entirely on some budget devices.

  Reads saved imagesGoogle Lens reads a code out of a photo or screenshot from the gallery, which covers the screenshot case without a third-party app on most devices.

  Source: Google, Scan QR codes

• Windows

  Scans with the cameraThis surprises people, including us: the Windows Camera app has a Barcode button, and Microsoft documents it reading QR codes and barcodes through the webcam. For a QR code it shows the link, for a barcode it copies the text.

  Cannot read imagesNothing in Windows reads a code out of a screenshot, and the webcam route cannot help you: pointing a webcam at your own monitor is glare, moire and misery. This is the gap that sends Windows users looking for software, and a page that decodes in the browser tab is the version that does not upload your screenshot.

  Source: Microsoft, How to use the Windows Camera app

• macOS

  No camera scannerNo built-in scanner app. The FaceTime camera is there, but nothing in macOS points it at a QR code for you.

  Undocumented, test itLive Text in Preview and Photos handles text in images, and Apple's documentation for it covers phone numbers, addresses and links rather than QR symbols. We could not confirm QR detection from Apple's own docs, so do not plan around it. Test it on one screenshot before you trust it, and keep a local decoder for when it does not work.

  Source: Apple, Live Text in Preview on Mac

• Ubuntu and Linux

  No camera scannerNothing built in for the webcam, and honestly nobody wants it. The terminal route is better anyway.

  Reads saved imageszbarimg from the zbar-tools package reads a code out of any image file, prints the payload to stdout, and handles several codes in one image. It scripts over a folder in one line, which no phone app will ever match.

  sudo apt install zbar-tools
  zbarimg --quiet --raw screenshot.png
  for f in *.png; do zbarimg --quiet --raw "$f"; done

• Any browser

  No camera scannerBrowsers can reach the camera through the getUserMedia API, so a web page can scan, but no browser ships a scanner of its own.

  Cannot read imagesSame answer: a page can decode an image entirely in the tab, and plenty do, but the browser gives you nothing out of the box. If you use one, check the network panel while it decodes. A tool that uploads your screenshot to decode it has thrown away the only advantage it had.

The browser row is the one that changed since this was written. No browser ships a scanner of its own, which is still true, but a page can reach the camera through getUserMedia and decode in the tab. This site now does both: the camera scanner reads a code held up to a webcam, and the image reader decodes a file. Both run on jsQR in the tab, which is the same decoder used for the measurements further down this page. Apply the test in the row above to either of them: open the network panel and watch what happens while it decodes.

Why Screenshots Fail, Measured in Pixels

A code arrives in a chat, you screenshot it, nothing reads it, and you go looking for a better scanner app. That search is usually wasted, because the screenshot lost the thing a decoder needs before any app got involved.

A decoder needs enough pixels per module to tell a dark module from a light one. Resizing an image averages neighbouring pixels together, so module edges turn grey, and below a certain width the grid stops being recoverable. The floor is not a fixed pixel count, because it depends on how many modules the code has, which depends on how much data somebody encoded.

Read the bottom row against the top one. The short URL still decoded at 60 pixels wide. The tracked campaign URL, which is the same page with four utm parameters bolted on, failed below 90. Both were resized by the same code, decoded by the same decoder, in the same run.

Three things follow. Ask for the original file rather than a screenshot of it. If you have to crop, crop tight and do not resize afterwards. And if you are the one making codes that will travel through chat apps, keep the payload short: every character you add raises the pixel floor for everyone downstream, and they will blame their scanner for it.

One caveat on reading that table as a floor. It samples nine widths, and sampling hides the shape: sweeping every whole pixel width instead shows failures and successes interleaving near the edge, so a code can fail at one width and read at a narrower one. Scanning a QR code from a screenshot has that finer measurement, and the practical upshot is worth knowing: a failed decode is not proof the image is too small.

Method, so you can argue with it: each code is rendered at 16 pixels per module, averaged down to the target width with a box filter, then decoded with jsQR, the library that gates downloads on this site. No blur, no JPEG artefacts, no camera, and one decoder. Two limits follow. Another decoder will draw its line in a slightly different place, so what transfers is the direction rather than the pixel count: a denser code needs a wider image. And we have measured clean synthetic images, never photographs, so nothing here tells you what a camera in a dim room manages.

Decoding Offline Is Not the Same as Finishing Offline

Decoding is arithmetic on an image, so it needs no network by design, and the three platforms above document their own scanners working on the device. We have not surveyed the app stores, so read that as the documented cases rather than a claim about every app. The more useful question is whether the thing inside the code can finish without a network, and that depends on the payload rather than on which scanner you picked.

Wi-Fi is the case worth remembering, because it is the one where offline scanning is not a nice-to-have. A guest joining your network has no connection yet by definition. The credentials have to come out of the pattern itself, and they do, which is also why sharing Wi-Fi through a QR code is worth its own guide. For the full payload breakdown, including what each type costs in print size, see offline QR code generators for every device.

Most Scanner Apps Differ in One Thing: Formats

Strip away the star ratings and most scanner apps are the same three or four decoder libraries in different wrappers. What genuinely separates them is which formats that library reads, and it is the one thing an app store listing describes badly.

To make the point concretely, here is what the decoder on this site handles. It is the same library that gates every download here, so this is our own limitation rather than an opinion about somebody else’s app.

If your job involves shelves, parcels, library books or event badges, this table is the whole decision. Filter for multi-format support first and ignore everything else on the store page.

When You Genuinely Need a Business Scanner

A stocktake is a different job from a scan, and the apps built for it are a different product. These are the features that matter, and the ones marketing collapses into the word batch.

Continuous mode

Scans without asking you to press anything between codes. The difference between forty codes in a minute and forty codes in ten.

Duplicate detection

Warns when a code has already been captured in this session. In a stocktake, the double-scan is the error you cannot see afterwards.

Local record with later sync

Captures to on-device storage and uploads when the network returns. Worth separating from offline validation, which needs a local copy of the list you are checking against and is a much rarer feature.

CSV export

The thing that makes the session useful in a spreadsheet. Check whether export needs an account, because plenty do.

Quantity and custom fields

Scan once, type 12. Without it a warehouse count means scanning the same shelf label twelve times.

1D barcode support

Retail and logistics run on EAN, UPC and Code 128. A QR-only app is the wrong tool and no setting fixes it.

One distinction worth being pedantic about, because vendors are not. Offline capture means the app records scans with no network. Offline validation means it can check a scanned code against a list it already holds, which is what a ticket door at a festival with no signal actually needs. The first is common, the second is rare, and the words look identical on a feature page.

What a Scanner Should Be Allowed to Do

A scanner needs the camera. That is the list. Everything else on this table exists for a feature, and knowing which feature tells you what the app is really for.

• CameraRequiredThe only permission a live scanner genuinely cannot work without.
• Photos or filesOnly for one featureNeeded only to read codes out of saved images. Grant it per-image where the OS lets you.
• NetworkOnly for one featureDecoding needs no network at all. It is there to open the link you scanned, and to serve ads. Airplane mode separates those two motives quickly.
• LocationNo reasonA QR symbol contains no location data. If a scanner asks, the feature it is for is analytics, not scanning.
• ContactsNo reasonOnly if it writes a scanned vCard straight into your address book, and even then it can hand off to the OS contact sheet instead.
• MicrophoneNo reasonThere is no reading of this one that makes sense for a scanner.

The airplane-mode test settles the network question in about ninety seconds: turn it on, force-close the app, reopen it, scan. Still works, decoding was always local. Spinner, login screen or error, and the app was doing something with your image that it did not need to.

Scanning Codes You Did Not Print

Decoding locally protects your data from the scanner. It does nothing about the destination, and a sticker over a printed code is the cheapest attack in this whole subject.

• Read the URL before you tap it. Apple's Camera app and Android's camera scanning both surface the destination first, and that pause is the entire defence against a sticker stuck over the original code.
• Check the domain, not the brand name in the path. example-payments.com/bank is not your bank.
• Never type a login or card number into a page you arrived at by scanning something in public.
• Treat a code stuck onto a parking meter, a table or a poster as untrusted. Overlaying a printed code with a sticker is the cheapest attack in this whole subject.
• Decoding locally protects your data from the scanner app, not from the site the code points at. An offline scanner and a malicious destination coexist perfectly happily.

The one scanner feature that is genuinely a security feature is the URL preview: a scanner that shows you the destination and waits for a tap. Offline makes that more important rather than less, because with no connection there is no reputation service checking anything for you.

When the Scan Will Not Work

Six symptoms, and in five of them the scanner is innocent.

When the code itself is the problem rather than the image, why a QR code will not scan has the measured thresholds: the contrast cliff between 4.00:1 and 3.90:1, what a cropped quiet zone survives, and how much damage kills a finder pattern. QRMakery does not ship a scanner, so none of this is a pitch for one.