Files with the extension .tmp (temporary) often appear on Android after downloads, app updates or system operations. They can contain important data - from undownloaded videos to backup copies of settings. But how to open them if the smartphone does not recognize the format? In this article we will analyze 5 working methodsincluding the use of specialized applications, manual renaming and data recovery.

It is important to understand: TMP files are not intended for direct opening by the user. These are “drafts” that the system or apps create for temporary tasks. However, in some cases - for example, if the download fails or the original file is deleted - they become the only source of lost data. We will tell you how to safely extract information without damaging the system.

The article is relevant for all versions of Android (from Android 8.0 Oreo to Android 15) and most manufacturers: Samsung, Xiaomi, Honor, Realme, Google Pixel and others. If you encounter the “File is corrupted” or “Unable to open” error, here you will find solutions.

What are TMP files and why they do not open

Extension .tmp (from English temporary — “temporary”) is assigned to files that are created by apps or the operating system for intermediate operations. For example:

  • 📥 When downloading a video from the Internet, the browser first saves it as video.part or video.tmp, and after the download is complete, renames it to video.mp4.
  • 🔄 When updating the application via Google Play the system creates a temporary An APK file with the extension .tmpwhich later is deleted.
  • 💾 Some apps (for example, WhatsApp or Telegram) use TMP to store unsent media files.

By default, Android does not associates .tmp with some application, so when you try to open it, you will see the message “The file cannot be opened” or a prompt to select a app. The main problem is that without knowledge of the source format (JPG, MP4, PDF, etc.) it is impossible to correctly decode the data.

In addition, temporary files can be:

  • 🔒 Encrypted (for example, cache TikTok or Instagram).
  • 🗑️ Partially deleted —if the process is interrupted, the file can only contain a fragment of data.
  • 🛡️ Blocked by the system (for example, files from the folder /data/local/tmp).
⚠️ Attention: Not all TMP files contain useful information. Many of them are garbage left over from applications. Before trying to open it, check the file size: if it is less than 1 KB, it is most likely an empty “tail” from a deleted operation.

Method 1: Renaming the extension (the easiest method)

If you know (or guess) which one the format is hidden behind .tmp, you can simply rename the file. This method works in 90% of cases for media files (photos, videos, audio) and documents.

Instructions:

  1. Open any file manager (for example, Files by Google, Total Commander or built-in Mi File Manager on Xiaomi).
  2. Find the desired file with the extension .tmp and hold your finger on there to bring up the menu.
  3. Select "Rename» (Rename).
  4. Delete .tmp and enter the expected extension:
    • 📷 For photo: .jpg, .png, .webp
    • 🎥 For video: .mp4, .mkv, .3gp
    • 📄 For documents: .pdf, .docx, .xlsx
    • 🎵 For audio: .mp3, .m4a, .ogg
  • Confirm the change and try opening the file with a standard player.

    • If the file does not open after renaming, try another format. For example, if .jpg did not work, try .png or .webp.

    Try another extension from the list above|

    Check the file for integrity (size must be greater than 0 KB)|

    Use specialized software (see Method 2)|

    Try to open on PC (via Notepad++ or HxD)

    -->

    ⚠️ Attention: Do not rename system files from folders /system, /data or /cache. This may lead to failures in working on Android. Work only with files in folders Download, DCIM or on an SD card.

    Method 2: Using applications to open TMP

    If renaming does not work, use specialized apps. They analyze the contents of the file and try to determine its real format.

    Application Supported formats Link (Google Play) Features
    File Viewer for Android 150+ formats (documents, media, archives) Link Free, no ads, supports preview
    TMP File Opener TMP, PART, CRDOWNLOAD, TEMP Link Specialized for temporary files, restores interrupted downloads
    FX File Explorer Any formats (with plugins) Link Paid version opens encrypted files
    ZArchiver Archives (ZIP, RAR, 7Z) inside TMP Link Helps if TMP is an incomplete archive

    How to use:

    1. Install one of the applications (we recommend File Viewer for Android to get started).
    2. Open the app and find your .tmpfile.
    3. Click on it - application will suggest possible formats for opening.
    4. Select the appropriate one (for example, “Open as video” or “Open as document”).

    If the application does not detect the format, try manually selecting an option from the list. For example, for a 5 MB file, it is logical to try “Open as image” or “Open as video”.

    Files by Google|

    Total Commander|

    FX File Explorer|

    Mi File Manager (Xiaomi)|

    Other-->

    Method 3: Recovering interrupted downloads

    Often .tmpfiles appear when downloads are interrupted due to poor internet or server error. In this case, the file may be incomplete, but it can be “downloaded” or restored.

    If this is a download from the browser (Chrome, Firefox, Opera):

    1. Open the browser and go to the menu “Downloads» (Downloads).
    2. Find the interrupted download and click “Resume» (Resume).
    3. If there is no button, delete the file and start downloading again - the browser can automatically continue from where it left off.

      4. If this is downloading via Telegram, WhatsApp or another messenger:

      • 📥 Open the chat with the file and try downloading it again.
      • 🔄 In Telegram you can click on the file → “Download again».
      • 🗃️ Check the messenger folder in the file manager: usually it is /storage/emulated/0/Telegram/Telegram Documents or /WhatsApp/Media.

    To recover undownloaded files from Google Play or others stores:

    1. Go to Settings → Applications → Google Play Market → Storage.
    2. Click "Clear cache" and "Clear data».
    3. Start the store again and try updating/installing the application.
    💡

    If the file was downloaded via a torrent client (for example, uTorrent or FrostWire), check the folder /Download for the presence of files with the extension .!ut —these are under-downloaded torrents. They can be resumed through the client itself.

    Method 4: HEX code analysis (for experienced users)

    If standard methods do not work, you can try to determine the file format by its HEX signature unique code at the beginning of any file. This method requires a little technical knowledge, but gives 100% accuracy format definitions.

    Instructions:

    1. Install the app on Android Hex Editor (for example, Hex Editor by Eknoes).
    2. Open your .tmpfile in it.
    3. Look at the first 8–16 characters in the HEX editor. Compare them with the signature table:
    Format HEX signature (beginning of file) Example
    JPEG (JPG) FF D8 FF ÿØÿ
    PNG 89 50 4E 47 0D 0A 1A 0A ‰PNG......
    MP4 (video) 00 00 00 18 66 74 79 70 69 73 6F 6D ....ftypisom
    ZIP (archive) 50 4B 03 04 PK..
    PDF 25 50 44 46 %PDF

    If you found match, rename the file to the appropriate format (see Method 1). For example, if the signature starts with FF D8 FF, rename to .jpg.

    For convenience, you can use online file analysis services, for example, Gary Kessler’s File Signature Table (open on PC).

    ⚠️ Attention: Do not change the HEX code of the file manually if you are not sure of your actions. An error can completely ruin the data.

    Method 5: Transfer to PC and processing with specialized apps

    If nothing helps on Android, try transferring the file to your computer. There are more options for analysis and recovery.

    How to transfer a file:

    • 📱 Connect the phone to the PC via USB cable (select the "File transfer" mode on the phone).
    • 🖥️ On your computer, open the phone folder and copy the .tmpfile to a convenient location (for example, on your desktop).
    • 🔌 Alternative: upload the file to the cloud (Google Drive, Yandex Disk) and download to your PC.

    apps for working with TMP on a PC:

    • 🛠️ TrID — determines the format by signatures (download).
    • 🔍 HxD — HEX editor for in-depth analysis (download).
    • 📂 7-Zip - if TMP turned out to be an archive.
    • 🎬 VLC Media Player - tries to restore damaged videos.

    Example of working with TrID:

    1. Download and install TrID on your PC.
    2. Place your .tmpfile in the folder with the app.
    3. Run trid.exe via the command line: 
      trid "your_file.tmp"
    4. The app will show the most likely formats. Rename the file according to the result.

    If the file turns out to be video or audio, but cannot be played, try restoring it via VLC:

    1. Open VLC Media Player.
    2. Go to "Media» → «Open file" and select your .tmp.
    3. If playback does not start, try converting the file through "Tools» → «Convert/Save».

    Common errors and how to avoid them

    When working with .tmpfiles, users often encounter typical problems. Here's how to solve them:

    Error Cause Solution
    "The file is damaged" Incomplete download or interrupted copying Try to download/copy the file again. Use TMP File Opener to restore.
    "No application to open" Android does not know which app to open the file Rename the extension or install a universal viewer (for example, File Viewer).
    The file opens, but the content unreadable Incorrect format selected when renaming Check the HEX signature (Method 4) or try a different format.
    "Access denied" The file is located in a protected system folder Copy the file to /Download or to an SD card. To access system folders you need root.
    The file weighs 0 KB This is a “dummy” left after deletion Delete file - it is impossible to restore it.

    If you work with files from system folders (/data, /cache), remember:

    • 🔐 Without root access you will not be able to open or change them.
    • 🚨 Incorrect actions can lead to Android failure.
    • 🛠️ For secure access, use ADB (Android Debug Bridge) or specialized utilities like Root Explorer.
    What to do if the file was deleted?

    If you accidentally deleted .tmpa file, try restoring it using applications like DiskDigger or Recuva (on PC). Please note that the chances of recovery depend on how much time has passed since removal and whether the device has been used. The sooner you start recovery, the higher the likelihood of success.

    FAQ: Answers to frequently asked questions

    Is it possible to open a TMP file without additional apps?

    Yes, if you know the source format. It is enough to rename the extension (see Method 1). For example, if this is a photo, rename file.tmp to file.jpg and open through the gallery. However, determining the format without apps will require experience or luck.

    Why does not the file open after renaming?

    This means that you have selected the wrong format. Try other extensions or use HEX editor to analyze the signature (see Method 4). Also, the file could have been damaged during downloading - in this case, only re-downloading will help.

    Is it possible to convert TMP to MP4 or JPG?

    Conversion is possible only if the file is originally a video or image, but has the wrong extension. Use VLC for videos or GIMP/Photoshop for images. If the file is not media, conversion is meaningless.

    How to open TMP files from WhatsApp or Telegram?

    These files are usually located in the folders:

    • WhatsApp: /WhatsApp/Media/.Statuses (for statuses) or /WhatsApp/Media/WhatsApp Images.
    • Telegram: /Telegram/Telegram Documents or /Telegram/Telegram Images.

    Try renaming them to .mp4, .jpg or .png. If it doesn't help, download the file again via chat.

    Is it dangerous to open TMP files?

    The .tmpfiles themselves are not dangerous, but they may contain malicious code if they were downloaded from an unreliable source. Before opening:

    • Check the file via VirusTotal or Dr.Web.
    • Do not open files received from unknown senders.
    • Use a sandbox (for example, Sandboxie on a PC) for safe browsing.