---
title: 'How to Make an Invoice Barcode Wallpaper: Put Your Barcode and Photo on the Lock Screen—No App Download Needed'
url: https://joelin.cc/en/p/9896
source: https://joelin.cc/en/p/9896
lang: en
pubDate: '2026-10-12'
date_modified: '2026-10-12'
description: Turn Taiwan’s mobile invoice barcode into a lock-screen wallpaper with your own photo. Learn the steps, phone sizes, and barcode placement—no app download needed.
author: joe
ai_role: ai_only
translation_of: /p/9896
---

# How to Make an Invoice Barcode Wallpaper: Put Your Barcode and Photo on the Lock Screen—No App Download Needed

## Summary

This article explains the problem that an invoice barcode wallpaper—a phone lock-screen wallpaper containing Taiwan’s mobile e-invoice barcode—is intended to solve, how to make one, and the reasoning behind its design. At checkout, unlocking a phone, opening an invoice app, and finding the barcode page takes around five or six seconds or more; placing the barcode on the lock screen lets the cashier scan it as soon as you press the side button. Homemade barcode wallpapers often fail to scan for four reasons: enlarging a screenshot blurs the barcode’s edges; an image that does not match the screen dimensions is resized or cropped by the system; the clock or notifications cover the barcode; or a barcode with a transparent background has insufficient contrast when placed over a photo. FanSupport’s tool at fansupport.joelin.cc/card/ offers a five-step process: select ‘Phone Wallpaper’; choose a photo, which is processed only in the browser and is not uploaded; enter the eight-character mobile barcode, with the slash added automatically if only seven characters are entered; select the phone model and barcode position, either the recommended middle position between the clock and notifications or a lower position; then sign in, download for free, and set the image as the lock-screen wallpaper. The finished image is stored in the member account for 14 days. The tool exports an image matching the full screen dimensions for the selected model—for example, 1320 × 2868 for iPhone 16 Pro Max / 17 Pro Max, 1179 × 2556 for iPhone 14 Pro / 15 / 15 Pro / 16, and the common Android size of 1080 × 2400—to avoid system resizing. The barcode sits in a white box, spans roughly 70–80% of the screen width, has bars one-quarter as tall as the barcode is wide, includes ‘Mobile barcode:’ and the barcode value underneath, and aligns the bars to whole pixels. Version 1.3 of the Ministry of Finance’s E-Invoice Integration Service Platform guidelines, dated July 1, 2026 (ROC year 115), requires both the barcode symbol and its value when a mobile barcode is printed or displayed; this also applies to screen displays. The tool’s output was tested 58 times using the same recognition engine as the iPhone camera, and every test returned the original barcode. Convenience-store scanners vary, however, so users should test their lock screen once after setting it up. The same tool can also make 85.6 × 54 mm PVC photo cards with an invoice barcode and 55 × 85 mm idol photo cards. Compared with Apple Wallet, which is official and free but does not let users replace the card face with their own photo, and invoice app widgets, which require an app and have size constraints, lock-screen wallpaper requires no app, works on both iPhone and Android, and lets users fill the screen with their own photo. The lock screen is recommended because app icons can cover the barcode on the home screen.

## Key facts

- An invoice barcode wallpaper puts your mobile barcode on the lock screen. Press the side button to light up the screen for the cashier to scan; no unlocking or opening an app is needed.
- Homemade barcode wallpapers often fail to scan for four reasons: an enlarged screenshot becomes blurry, mismatched dimensions cause resizing or cropping, the clock or notifications cover the barcode, or a transparent background provides insufficient contrast.
- FanSupport’s five steps: select Phone Wallpaper → choose a photo → enter the mobile barcode → select the phone model and barcode position → download and set it as the lock-screen wallpaper.
- Photos are processed only in the browser and are not uploaded. Downloading requires a free sign-in, and the finished image is stored in the member account for 14 days.
- The recommended barcode position is in the middle, between the clock and notifications. If you choose the lower position, dismiss notifications before checkout.
- Wallpaper dimensions should match the phone model: 1320 × 2868 for iPhone 16 Pro Max / 17 Pro Max, 1179 × 2556 for iPhone 15 / 16, and a common Android size of 1080 × 2400.
- The barcode sits in a white box, spans roughly 70–80% of the screen width, has bars one-quarter as tall as the barcode is wide, and includes ‘Mobile barcode:’ plus the barcode value underneath.
- Version 1.3 of the Ministry of Finance platform’s guidelines requires both the barcode symbol and its value when a mobile barcode is printed or displayed; displaying it on a screen also counts.
- After setting up the wallpaper, use another phone to scan the lock screen once and confirm that the barcode can be read.
- The same tool can also make 85.6 × 54 mm PVC photo cards with an invoice barcode and 55 × 85 mm idol photo cards.
- Use the lock screen rather than the home screen: app icons can cover the barcode on the home screen.

The original Chinese article was published on October 10, 2026.

An invoice barcode wallpaper is simply a lock-screen wallpaper containing your mobile barcode—the barcode used as a carrier for Taiwan’s electronic invoices. At checkout, press the side button and the screen lights up with the barcode already visible. There is no need to unlock your phone or find an app; the cashier can scan it directly.

The quickest way to make one yourself: open FanSupport’s [mobile barcode wallpaper tool](https://fansupport.joelin.cc/card/?type=wallpaper), choose a photo, enter your mobile barcode, and select your phone model. Download the image, set it as your lock-screen wallpaper, and you are done. Your photo is processed only in your browser and is not uploaded.

The explanation below has three parts: what problem this approach is meant to solve, how to do it step by step, and why I chose the lock screen over other approaches.

![Example of an invoice barcode wallpaper: a phone lock screen with a white rabbit illustration as the background. A mobile barcode with black bars in a white box and the text “Mobile barcode: /AB12+3.” appears in the lower-middle area. Beside it is a credit-card-sized invoice barcode card made with the same illustration.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-10/carrier-wallpaper-photo-hero/hero)

## 1. The Problem: Those Ten Seconds at Checkout

At a convenience-store checkout, the cashier asks, “Do you have an invoice carrier?” What follows usually goes like this: unlock your phone, find the invoice app, wait for it to open, navigate to the barcode page, and turn up the brightness. If everything goes smoothly, it takes five or six seconds. If the app needs an update or the network is slow, it takes longer, with people waiting behind you.

That is why many people have started putting their barcode somewhere on their phone that is quicker to reach. On Google, “載具 桌布” (“invoice carrier wallpaper”) gets several thousand searches a month, and “載具條碼放桌面” (“put invoice carrier barcode on the home screen”) gets over a thousand. People try all sorts of methods: pasting a screenshot onto a photo, compositing it in a photo-editing app, or generating it with AI.

The problem is that these homemade wallpapers often will not scan. The reasons generally fall into four categories:

- The barcode screenshot has been enlarged. A screenshot is a raster image. Enlarging it blurs the black-and-white edges into a gray fringe, making it difficult for the scanner to measure the width of each bar accurately.
- The image dimensions do not match the phone screen. If the wallpaper has the wrong proportions, the phone automatically resizes or crops it. The barcode is resampled again and may become blurry or have part of it cut off.
- The barcode is in the wrong position. It sits directly beneath the clock or is covered by notifications, so only half of it is visible when you bring it up.
- The barcode has a transparent background. Placing it directly over a busy photo lets the background colors interfere with recognition. Without enough contrast, it will not scan.

There is also the question of how it looks. Everyone’s barcode page in an invoice app looks the same. But your lock-screen wallpaper is already the image you see most often each day, and many people use a photo of their child, pet, or favorite idol. A barcode and a photo can coexist; someone just needs to get the layout right.

## 2. How to Make One: Five Steps

### 1. Open the Tool and Select “Phone Wallpaper”

On your phone, open [fansupport.joelin.cc/card/](https://fansupport.joelin.cc/card/?type=wallpaper). Under “What would you like to make?” at the top, select “Phone Wallpaper.” Opening the tool on a phone adds a “This Phone” option, which exports the image at your screen’s resolution.

### 2. Choose a Photo and Adjust Its Position

Choose an image under “Photo.” In the preview, you can drag to reposition it and pinch with two fingers to zoom. “Center Photo” returns it to the middle with one tap.

The photo is read and composited only in your browser. The original photo never leaves your phone.

### 3. Enter Your Mobile Barcode

A mobile barcode has eight characters, beginning with a slash—for example, /AB12+3. You can also enter just the seven characters after the slash; the tool adds the slash automatically. Full-width characters are automatically converted to half-width characters as well.

Do not know your mobile barcode? You can find it in the Ministry of Finance’s “統一發票兌獎” (Uniform Invoice Prize Redemption) app or after signing in to the [E-Invoice Integration Service Platform](https://www.einvoice.nat.gov.tw/). The tool asks only for the barcode, not your phone number.

### 4. Select Your Phone Model and Barcode Position

Under “Phone,” select your model. “Barcode Position” offers two options:

- Middle (recommended): the barcode sits between the clock and notifications, where lock-screen elements will not cover it.
- Lower: more of the photo is visible, but incoming notifications may cover the barcode. Dismiss them before checkout.

Check “Show the lock-screen clock and notification positions.” The preview will outline the areas for the clock, widgets, notifications, flashlight, and camera buttons with dashed boxes, so you can see at a glance whether anything will obstruct the barcode. These boxes appear only in the preview, not in the downloaded file.

![Barcode positions on an invoice barcode wallpaper: on the left, the tool’s preview uses dashed boxes to mark the clock and widgets, notifications, flashlight, and camera areas. The white barcode box sits between the clock and notifications. On the right, the finished wallpaper uses the “Lower” barcode position, leaving more of the rabbit illustration visible.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-10/carrier-wallpaper-lockscreen-zones/hero)

### 5. Download and Set It as Your Lock-Screen Wallpaper

Tap “Download PNG.” You need to sign in before downloading; signing in is free. The finished image is stored in your member account for 14 days, then deleted automatically. You can also delete it yourself at any time.

To set it as your lock-screen wallpaper:

- iPhone: save the image to Photos, press and hold the lock screen → tap “+” → “Photos” → select the image.
- Android: go to “Settings” → “Wallpaper” → select the image and apply it to the “Lock Screen.”

Do not skip the final step: after setting it up, use an invoice app on another phone, or any scanner, to scan your lock screen once. Confirm that it can be read before using it at checkout.

## 3. Wallpaper Dimensions for Common Phones

The tool’s built-in phone models and their corresponding lock-screen dimensions are listed below. Choosing the right dimensions means the phone will not resize the image again, and every barcode bar will align with whole pixels.

| Phone model | Wallpaper dimensions (pixels) |
| --- | --- |
| iPhone 16 Pro Max / 17 Pro Max | 1320 × 2868 |
| iPhone 14 Pro Max / 15 Plus / 15 Pro Max / 16 Plus | 1290 × 2796 |
| iPhone Air | 1260 × 2736 |
| iPhone 16 Pro / 17 / 17 Pro | 1206 × 2622 |
| iPhone 14 Pro / 15 / 15 Pro / 16 | 1179 × 2556 |
| iPhone 12 Pro Max / 13 Pro Max / 14 Plus | 1284 × 2778 |
| iPhone 12 / 13 / 14 (including Pro) / 16e | 1170 × 2532 |
| iPhone 12 mini / 13 mini | 1080 × 2340 |
| iPhone SE (2nd and 3rd generations) / 8 | 750 × 1334 |
| Common Android models | 1080 × 2400 |

The point of this table is that phones differ. Most invoice barcode wallpaper templates circulating online come in only one size. Apply one to a different phone, and it gets resized or cropped. Barcodes are particularly sensitive to resizing, so the output dimensions need to match the phone model. There are too many Android models to list, so the table includes only the most common size, 1080 × 2400. For the most accurate result, open the tool on your phone and select “This Phone.”

## 4. Why the Barcode Is Laid Out This Way

The barcode placement in the tool is deliberate. There is a reason behind every measurement:

- Black bars in a white box: the barcode sits on a white background, ensuring enough contrast between bars and spaces regardless of how busy the photo is.
- Width of roughly 70–80% of the screen: the wider the barcode, the thicker its narrowest bar becomes, making it easier to scan.
- Bar height of one-quarter of the barcode’s width: even if the scanner’s scan line is slightly tilted, it can still read the complete barcode.
- “Mobile barcode: /AB12+3.” printed underneath: if the barcode is scratched or will not scan, the cashier can enter the value manually.
- Every bar aligned to whole pixels: this avoids gray edges caused by a bar falling halfway across a pixel.

The Ministry of Finance’s E-Invoice Integration Service Platform guidelines in effect at the time of the original article—version 1.3, dated July 1, 2026 (ROC year 115)—cover both “printing” and “displaying”: when consumers print or display a mobile barcode, they must include both the barcode symbol and its value. A barcode shown on a screen therefore counts as well. The value underneath the barcode is there to meet this requirement. The specification details and the background to the older 60 × 20 mm dimensions are explained in [How to Print a Mobile Barcode](/p/9745).

I tested the tool’s output using the same recognition engine as the iPhone camera: 29 output images, comprising invoice barcode cards and wallpapers for various phone models in both barcode positions. I scanned each once at its original size and once reduced to 40%. All 58 scans returned the original barcode value. Convenience stores use many different scanner models, though, so the earlier advice to “scan it yourself first” still applies.

## 5. What Else the Same Tool Can Make: Photo Cards with an Invoice Barcode and Idol Photo Cards

If you want something physical, select “Invoice Barcode Card” in the same tool to make a [photo card printed with your mobile barcode](https://fansupport.joelin.cc/card/?type=carrier). It is a PVC card the same size as a credit card or EasyCard (85.6 × 54 mm). The file includes 1.5 mm of bleed on each edge at 300 dpi. After downloading it, take it to a print shop or card manufacturer yourself. The barcode measures approximately 60 × 9 mm on a landscape card and 45 × 9 mm on a portrait card, with the narrowest bars at least 0.25 mm wide.

![Example of a photo card with an invoice barcode: a portrait-oriented, credit-card-sized card with a rabbit illustration at the top and a mobile barcode inside a white box below, along with “Mobile barcode: /AB12+3.” The finished card measures 85.6 × 54 mm.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-10/carrier-photo-card-pvc-sample/hero)

Selecting “Idol Photo Card” produces a 55 × 85 mm photo card that fits standard card sleeves. For the background to these dimensions and how to allow for bleed, see [What Size Is a Photo Card?](/p/9741).

If you simply want to print the barcode—for example, one copy at an ibon kiosk and another to keep in your wallet—and do not need a photo, the [invoice carrier barcode generator](https://tools.joelin.cc/carrier-barcode/) is quicker. It redraws the barcode according to the Code 39 specification and lays it out in several commonly used sizes.

## 6. Why the Lock Screen, Rather Than Wallet or a Widget?

There are currently three ways to put a barcode somewhere you can reach without opening an app, each with its own trade-offs:

- Apple Wallet: the mobile barcode page on the Ministry of Finance’s E-Invoice Integration Service Platform lets you add your barcode to Apple Wallet. It is free and official. The drawback is that the card faces all look the same; you cannot replace yours with your own photo.
- Widgets: some invoice apps offer home-screen or lock-screen widgets, but you have to install the app, and the widget’s size limits how wide the barcode can be.
- Lock-screen wallpaper: it depends on neither an app nor Apple, and works on both iPhone and Android. Press the side button once to display it, with your photo filling the screen.

I chose the lock screen as the first step because it is the only option that lets the whole image be yours. A Wallet card has room for an image only in a horizontal banner on the card face; it cannot accommodate a full photo. Your lock screen, on the other hand, is already the image you look at every day. Adding the barcode means you do not have to remember another step.

You can also use the image on the home screen, but app icons will cover the barcode, so I recommend the lock screen.

This tool was originally made for idol fans—many already have their favorite idol on their lock screen, so instead of switching between two screens, why not combine them? But it works for anyone: you can use a photo of your child, pet, or travels. Photos are not uploaded, barcodes are not recorded separately, and the downloaded image is stored only in your own account. These were principles I established when making the tool: your mobile barcode is tied to your invoices and prize-winning records, and it should not be used for other purposes.

Article keywords: invoice barcode wallpaper, invoice carrier barcode on the home screen, mobile barcode lock screen, iPhone invoice carrier lock screen, invoice carrier barcode wallpaper, phone wallpaper dimensions, photo card with an invoice barcode

## Frequently asked questions

### Should I put my invoice barcode on the home screen or the lock screen?

Use the lock screen. Pressing the side button lights it up without unlocking the phone. You can also use the same image on the home screen, but app icons can cover the barcode and prevent the scanner from reading it in full.

### What should I do if my invoice barcode wallpaper will not scan?

First turn up the screen brightness, then dismiss any notifications covering the barcode. If it still will not scan, the image itself is probably the problem: the barcode may have been enlarged from a screenshot, the phone may have resized an image whose dimensions do not match the screen, or the barcode may lack a white background. Generating a new wallpaper at the full screen dimensions for your phone model, with black bars on a white background, will usually solve the problem.

### Will my photo be uploaded when I use this tool to make an invoice barcode wallpaper?

The original photo will not. The photo is read and composited only in your browser. When you download, the finished image is stored in your member account for 14 days, where only you can see it. It is then deleted automatically, and you can also delete it yourself at any time.

### Where can I find my mobile barcode?

You can find it in the Ministry of Finance’s 統一發票兌獎 (Uniform Invoice Prize Redemption) app or after signing in to the E-Invoice Integration Service Platform. The mobile barcode has eight characters, beginning with a slash. The tool needs only those eight characters, not your phone number.

### Does making an invoice barcode wallpaper cost money?

No. The tool is free, and you need to sign in to a free account before downloading. If you want a physical invoice barcode card, you arrange and pay for printing separately with a print shop or card manufacturer. The tool only generates the file.

### Does the line underneath the barcode have to include the words ‘Mobile barcode:’?

The barcode value must be included; the words ‘Mobile barcode:’ are optional. The Ministry of Finance platform’s current guidelines require both the barcode symbol and its value when a mobile barcode is printed or displayed. That line also lets a cashier enter the value manually if the barcode cannot be scanned.