Every year, the volume of information that we store on smartphones is growing exponentially. High-resolution photos, 4K videos and heavy documentary packages quickly fill up the device's internal memory. In such situations, users often look for ways to optimize data storage, and one of the most effective methods is archiving.
The procedure data compression on mobile devices allows not only to reduce the space taken up, but also to simplify the transfer of files via instant messengers or email. However, many gadget owners encounter difficulties, since the built-in system tools are not always obvious or limited in functionality. Understanding how encryption and packaging algorithms work will help you choose the right tool.
In this article, we will look in detail at how to compress files on Android, which formats provide the best compression, and why a standard file manager may not cope with complex tasks. You will learn about the nuances of setting the compression ratio and the differences between popular extensions.
Built-in Android capabilities and file managers
Modern Android shells, such as MIUI, One UI or OxygenOS, often include basic functions for working with archives directly into the standard file manager. This is convenient for simple tasks when you need to quickly pack several photos or documents without installing additional software. Typically, the algorithm works automatically when a group of files is selected.
To create an archive using standard means, you need to select the desired objects, click on the menu (often three dots or the "More" icon) and select Compress or Add to archive. The system will prompt you to specify the name of the future file and, in rare cases, the compression type. The default format is most often used ZIP, which provides a balance between processing speed and final size.
However, it is worth considering that built-in utilities rarely allow you to flexibly configure parameters. You will not be able to select the maximum compression level or set a password for unpacking in the basic version of the manager. In addition, some manufacturers remove the function of creating archives, leaving only the ability to unpack them.
If the standard manager does not show the "Compress" button, try long-pressing on the file and looking in the drop-down menu - sometimes this function is hidden in the "File Operations" subsection.
For most everyday tasks, standard tools are quite enough. But if your goal is to minimize the size of transferred data, you will have to turn to specialized solutions.
Top applications for professional compression
When built-in functions are not enough, applications from Google Play come to the rescue, designed specifically for working with archives. The market leaders are ZArchiver, RAR from RARLAB and B1 Archiver. These apps provide extensive control over the packaging process and support dozens of formats.
The application ZArchiver is considered one of the most powerful tools due to its support for multi-volume archives and the ability to work with encrypted containers. The app interface is intuitive: you select files, click on an icon and get access to detailed settings. Here you can choose a compression method: from fast Store (no compression) to ultra-compression Ultra.
- 📦 ZArchiver —the best choice for working with 7z and ZIP, supports scripts and plugins.
- 🔒 RAR —an official application from the creators of the format, ideal for working with .rar and restoring damaged archives.
- ⚡ B1 Archiver —features a modern design and high speed of working with large volumes of data.
Using third-party software gives access to advanced functions, such as creating self-extracting archives (SFX) and splitting the file into parts of a given size. This is critical when sending files through services with attachment size restrictions.
Installing any of these applications will take a couple of minutes, but will significantly expand the capabilities of your smartphone in managing the file system. The choice of a specific tool depends on what formats you work with most often.
Choosing a format: ZIP, RAR or 7Z?
The compression efficiency directly depends on the selected algorithm and file extension. Not all formats are equally useful in different situations. Understanding their differences will help you save disk space and time when transferring data.
Format ZIP is a universal standard. Its main advantage is compatibility. Almost any operating system, from Windows to macOS and Linux, can open a ZIP archive without installing additional software. However, its compression ratio is average, and for very large files it may not be the most effective solution.
Formats RAR i 7Z use more modern compression algorithms, which can reduce the final file size by 10-20% more than ZIP. This is especially noticeable when working with text documents, databases and executable files. But to open such archives, the recipient may need a special application.
⚠️ Attention: When choosing the 7Z format with the maximum compression level, the packaging time may increase several times, and the battery consumption of the smartphone will increase significantly.
Below is a comparative table of popular formats that will help you make your choice:
| Format | Compression level | Working speed | Compatibility |
|---|---|---|---|
| ZIP | Medium | High | Universal |
| RAR | High | Medium | Requires software |
| 7Z | Very high | Low | Requires Software |
| TAR.GZ | High | Medium | Linux/Android |
If you are sending a file to a colleague or friend who may not be tech savvy, it is better to choose ZIP. If your goal is personal storage of backup copies while saving every megabyte, feel free to use 7Z.
Step-by-step guide for creating a compressed archive
Let's consider the process of creating an archive using the example of a popular application ZArchiver, since it provides the most complete control over the parameters. The procedure is similar in most similar apps, but here we will show all the nuances of the setup.
First, open the application and go to the directory where the files that need to be packaged are stored. Select them by clicking on the checkmarks next to their names. After selection, click on the archive icon at the bottom of the screen or in the action menu.
☑️ Archive creation algorithm
The parameter settings window will open. The key element here is the paragraph Archive format. Select the desired type from the list. Next, find the setting Compression level. The default is often “Normal”, but to maximize space savings, switch it to “Ultra” or “Maximum”.
You can also set a password in this menu if you want to protect your data from prying eyes. Enter the combination in the appropriate field and confirm it. After setting all the parameters, click the button OK to start the process.
What is a multi-volume archive?
A multi-volume archive is a file divided into several parts of a given size (for example, 10 MB each). This is useful for transferring large data through instant messengers that have a limit on the size of a single file. All parts of the archive are needed for unpacking.
The time it takes to create an archive depends on the amount of data and the selected compression level. While working, try not to switch between heavy applications so as not to overload the device’s RAM.
Setting the compression level and impact on resources
Many users do not think about the fact that the “Compression level” parameter affects not only the final size, but also the load on the smartphone’s processor. Ultra-compression algorithms require significant computing power to search for repeating patterns in the data.
If you select the mode Ultra or Maximum the device processor will operate at peak frequencies for a long time. This inevitably leads to heating of the case and rapid discharge of the battery. If you archive files in the background, the system may even limit the speed of the process to prevent overheating.
⚠️ Warning: It is not recommended to run compression of large video files in Ultra mode when the battery charge is less than 30%, as the device may turn off in the process, damaging the archive.
The optimal choice for most tasks is level Normal or Good. The difference in the final size compared to ultra-compression is often only a few percent, but the processing time is reduced significantly, and the phone remains cool.
If you are working with an older device with a small amount of RAM, avoid creating large multi-volume archives. This may cause the system to force the application to close due to lack of resources (OOM Killer).
The balance between processing time and file size is more important than chasing maximum compression. The "Normal" mode saves up to 50% of time and energy with minimal loss of efficiency.
Troubleshooting and common errors
When working with archives, users may encounter various errors, from the "Not enough space" message to corrupted file structure. Most often, the problem lies in the features of the Android file system or access rights restrictions.
An error Not enough memory when creating an archive can occur even if there is free space. This is because the temporary files of the compression process require a volume approximately equal to the size of the original data. Make sure you have at least 1.5 times more free space than the size of the files you are archiving.
Another common problem is the inability to write a file to a specific folder. Starting with Android 11, access to system directories is limited. Try saving the archive to a shared folder Download or to internal storage, and then move it manually.
- 🚫 CRC error when unpacking, indicates file corruption, often due to an interrupted write or a failed download.
- 📂 Incorrect path occurs if you try unpack the archive into a protected system folder without root access.
- 🔋 Application crash during compression is usually associated with insufficient RAM or processor overheating.
If the archive does not open on another device, check whether it supports it is the selected format. Sometimes the problem can be solved by simply repackaging the files into a more compatible ZIP.
Why does the archive take up as much space as the original files?
This happens if you try to compress files that are already in a compressed format. Video (MP4, MKV), music (MP3, AAC) and images (JPG, PNG) use their own compression algorithms. Repeated archiving of such data has practically no effect, and sometimes even slightly increases the size due to the service headers of the archive.
Is it possible to compress an installed application (APK)?
The APK installer file is itself a ZIP archive. You can compress it again, but the gain in size will be minimal (1-3%). In addition, a compressed APK cannot be installed directly and will have to be unzipped first. This only makes sense for long-term storage of backup copies.
Is it safe to delete the originals after creating an archive?
Yes, it is safe, but only after you check the integrity of the created archive. Try opening it and extracting one file to make sure the data is not corrupted. Only after successful verification can you delete the source files to free up space.
How to recover a damaged RAR archive on your phone?
The RAR format has a function for restoring records, but it only works if recovery information was added when creating the archive. RARLAB's RAR app has a "Repair" feature that can attempt to fix errors, but success is not guaranteed, especially with severe damage.