Smartphones are no longer just calling devices, becoming powerful document tools. Xiaomi and Redmi device owners often face the need to send a passport scan, contract or tutorial electronically, but do not always know how to properly package photos into a single file. The standard operating system MIUI offers several built-in solutions that allow you to convert images into Portable Document Format format without using third-party services.
The challenge for beginners is that the shell interface can change from version to version, and the function is sometimes hidden in non-obvious menus. However, if you understand the logic of Xiaomi's file system, the document creation process takes only a few seconds, and this is especially true for students who need to take lab work, or for employees working remotely.
In this article, we will take a look at all the conversion options available, from standard system tools to specialized utilities, how to combine multiple images into one file, how to improve text readability, and what export settings to choose for maximum quality.
Use of the built-in MIUI Gallery
The fastest way to get PDF-The file from the photo is the standard Gallery app, which is pre-installed on all smartphones of the brand, which is ideal when you need to send one document or photo urgently, and there is no time to deal with complex settings. You open the desired image, call the menu of additional options and choose the print or save function.
It is important to note that the buttons may vary slightly from one version of the MIUI shell, usually in the lower menu or hidden under the "More" button (three dots). If you don't see the "Save as PDF" option right away, try clicking on the printer icon, as in Android, printing into a file is often equated with saving a document.
The quality of the final file depends on the resolution of the original image. If the photo is taken in good light and the Xiaomi camera does not apply strong noise cancellation, the text in the PDF will be clear and readable. However, for batch processing of a large number of pages, this method may not be the most convenient, since you have to repeat the operation for each image separately.
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Use the Document mode in the Camera app before shooting – this automatically aligns the perspective and increases the contrast of the text, which will improve the quality of the future PDF.
Conversion through the Annex Documents
A more advanced tool is the Documents system app (or Files in newer versions of MIUI), which allows you not only to save pictures, but also to fully manage them by creating multi-page files. To get started, you need to open the application and go to the section where your images are stored, usually called Images or Pictures.
Select one or more photos you plan to combine. After highlighting at the bottom of the screen, a toolbar will appear where you need to find a "More" button or a three-dot icon. The menu that opens often features an "Create PDF" or "Export" option that triggers the conversion wizard. The system will prompt you to select the order of pages and the orientation of the sheet.
The advantage of this method is that you can batch it up, you can pick 10, 20 or more photos and turn them into one structured document, which is indispensable when scanning multi-page contracts, spread passports or educational materials, and you can save the file to the same folder where the originals were, or to a special MIUI/Doc directory.
☑️ Verification before conversion
Working with the Mi Scan scanner
Xiaomi's ecosystem includes a special application called Mi Scan (or simply "Scanner"), which is designed specifically for working with paper media. Unlike a regular camera, this tool can automatically determine the boundaries of a document, remove shadows and align the image along the plane. Translating photos to PDF is the main function, not a side function.
When you run an app, you can not only take a new image, but you can also select an existing photo from the gallery by clicking on the appropriate thumbnail. After processing the image with artificial intelligence algorithms, the image becomes similar to a quality scan. Then the program will offer to save the result in PDF format, which is especially convenient for official documents.
⚠️ Warning: When using automatic color enhancement, check the result before saving. Sometimes the algorithm can whiten the background too much, making the pale text on the original unreadable. Always check the digital copy with the paper original.
Another useful feature of Mi Scan is the ability to recognize text (OCR), although for Russian it works with varying success. Once saved to PDF, you can send the file directly to messengers or cloud storage without leaving the application, which makes the process as fast and efficient as possible for daily tasks.
Create a PDF with multiple images at once
When it comes to generating reports or training materials, it is critical to combine many disparate images into one file. In the MIUI interface, this can be done through the file manager. Open the Explorer app, find the image folder (usually DCIM/Camera or Pictures) and go to highlight mode.
Once you have marked all the files you need, click the menu button and select the "Create PDF" option, and the system will suggest you adjust the parameters: paper size (A4, Letter), fields, and orientation. If the order of the photos is broken, it can be easily changed by drag and drop before the final save, which ensures that the pages in the document will go in the correct sequence.
The size of the final file will depend on the number of pages and the quality of the compression. If you are preparing a document for sending via email, where there is a limit on the amount of attachment, it makes sense to choose a more aggressive compression. For archival storage, it is better to leave the maximum quality to preserve all the details of the original.
| Parameter | Description | Recommendation |
|---|---|---|
| Page size | Virtual sheet format | A4 (document standard) |
| Orientation | Position of the image | Auto or contents |
| Quality. | Degree of data compression | High for text, medium for photo |
| chromaticity | Color reproduction mode | Black and white to save space |
Customize the quality and compression of files
When converting images to PDF on Redmi and Xiaomi smartphones, it is important to consider the balance between quality and file size. High resolution is necessary for documents with small print or drawings, where every detail is important. However, for simple text pages, excessive quality will only increase the weight of the file with no apparent benefit to readability.
In export settings, you can often find a choice between color, gray and monochrome (black and white). For common documents such as invoices, contracts or articles, Shades of Grey is optimal. It significantly reduces the file size compared to color mode, while preserving all the nuances of text and seals.
If you plan to send documents over the mobile Internet, where traffic may be limited, use maximum compression. In print or save settings, this is often indicated as "Traffic Savings" or "Low Quality." For important legal documents where the color of ink or the presence of color printing matters, choose "Original" or "High Quality" mode.
The effect of DPI on file size
Third-party applications for extended functions
While MIUI’s built-in tools cover 90 percent of users’ needs, sometimes more specific features are needed, such as editable text recognition, automatic page numbering, or watermarking, in which cases Google Play apps like Adobe Scan, CamScanner, or Microsoft Lens come to the rescue.
These applications have more powerful image processing algorithms: they can automatically remove fingers holding a document, align perspective even when there is a strong distortion, and improve the contrast of faded text. After processing, they also allow you to export the result to PDF, often with the ability to search through text inside the document.
However, privacy is important to remember: when you upload documents to third-party cloud services for processing, you transfer data to third parties. To work with personal data, passport information or banking information, it is better to use the offline mode of Xiaomi’s built-in tools, which do not require the Internet for basic conversion.
⚠️ Note: Many free versions of third-party apps add watermarks to created apps PDF-Read the terms of use carefully before starting work if you need a "clean" document without program logos.
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The built-in MIUI tools provide better privacy and quality for household tasks, whereas third-party applications are needed for professional processing and OCR.