When there are a large number of MP4 videos on a computer that need to be converted to MKV format, converting them one by one takes up a lot of time. Using HeSoft Doc Batch Tool as an example, this article explains how to use the "Convert Video to MKV" function in video tools to add multiple videos to the processing list at once, and complete the conversion through the steps of selecting files, setting the save location, and starting processing. The article also illustrates the conversion results with screenshots before and after processing, and compiles key points to note during batch conversion, such as file verification, save location, and result checking.
Many people encounter similar problems when organizing video materials: a folder contains a batch of MP4 videos that need to be placed into a media library, submitted to colleagues, used for course archiving, or uploaded uniformly, but the target requirement is MKV format. If there is only one video, manual conversion is not a big issue; but if there are dozens or even more, opening each one for conversion, selecting the save path one by one, and waiting for each to complete becomes very inefficient and repetitive.
This article introduces a method more suitable for office scenarios: using HeSoft Doc Batch Tool to convert multiple video files to MKV in one batch. The software is positioned as office software, with its core value being batch file processing, reducing repetitive operations, and improving processing efficiency. As seen in the screenshots, it provides a "Video to MKV" function within "Video Tools" and uses a wizard-style process, allowing users to first select the records to process, then set the save location, and finally start processing. The following will explain the applicable scenarios, the effects before and after processing, and the complete steps.
Applicable Scenarios: Why Batch Convert Multiple Videos to MKV
Video format conversion is not just an issue encountered by technicians. For office users in administration, operations, education and training, content production, and project management, video files are already part of daily materials. A meeting screen recording, a course shoot, a batch of promotional materials, or a project acceptance package may all contain many video files. In such cases, unifying the format to MKV can make material management more standardized.
Batch converting to MKV is common in the following situations:
- Course video organization: Teachers or trainers have multiple MP4 course segments that need to be uniformly converted to MKV for archiving.
- Project material delivery: The client requires video files to be unified in MKV format to avoid mixing various formats like MP4, MOV, and AVI.
- Material library construction: The team wishes to establish a unified-format video material library for easier future retrieval, backup, and use.
- Historical file standardization: A large number of video files have accumulated on the computer over time and need to be reorganized in a unified format.
- Reducing manual operations: When there are many files, adding them to a list at once using batch processing software is more reliable than manual conversion.
From an efficiency perspective, the key to batch conversion is "unified processing." Users only need to complete file selection and output settings once before starting, and the software can process multiple files consecutively according to the list. This is precisely the value of office software in file batch processing scenarios.
Effect Preview: Status of Video Files Before Conversion
Before conversion, there are multiple MP4 video files in the example folder, including Video test 23.mp4, Video test 24.mp4, Video test 26.mp4, Video test 27.mp4, Video test 29.mp4, and Video test 30.mp4. Their file thumbnails are different, indicating different content, but their format extensions are all .mp4.

This file status is very common in actual work: filenames are relatively standardized, and the formats are consistent, but they do not match the target format. Assuming the subsequent archiving requirement is MKV, this batch of MP4 files needs to be uniformly converted. During manual conversion, input selection, output settings, and waiting for saving must be repeated for each file; the more files, the more cumbersome the operation. Using a batch processing tool allows adding these files to the processing list at once, avoiding repetitive selections.
Effect Preview: Status of Video Files After Conversion
After batch processing is complete, the original MP4 videos have become MKV files. As seen in the screenshot, the main part of the filenames remains unchanged, for example, Video test 23, Video test 24, Video test 26, etc., are retained, with only the extension changed to .mkv. The advantage is that users do not need to re-establish file correspondence; checking the number tells which MKV comes from which original video.

The post-processing effect is very intuitive: the same batch of files changed from MPV to MKV. For scenarios requiring delivery or archiving, this result is easier to check. Users can confirm whether the conversion is complete based on three dimensions: file count, filename, and extension. For example, if there were 6 MP4s before processing, there should be 6 corresponding MKVs after processing.
Steps: From Function Entry to Batch Conversion Completion
Step 1: Open the Software and Navigate to Video Tools
After launching HeSoft Doc Batch Tool , first look at the left-side function navigation. In the screenshot, the left side has categories like "Home," "Task Flow," "All Tools," "File Name," "Folder Name," "File Organization," "Word Tools," "Excel Tools," "PowerPoint Tools," "PDF Tools," "Text Tools," "Image Tools," "Video Tools," "Audio Tools," etc. This time, we need to process video formats, so select "Video Tools."
After entering Video Tools, multiple video-related function cards are displayed on the right. Do not select "Video to MP4," "Video to AVI," "Video to MOV," or other formats here; instead, select "Video to MKV." The description on this card in the screenshot is "Batch convert video files to MKV format," which perfectly aligns with the goal of this article.

The purpose of this action is to enter the correct batch conversion module. The expected result is to open the "Video to MKV" processing page. For first-time users, it is recommended to first confirm whether the page title displays "Video to MKV" to avoid selecting the wrong output format.
Step 2: Add Videos by Adding Files or Importing a Folder
After entering the function page, two main entry points are provided at the top: "Add Files" and "Import Files from Folder." If you only want to convert a few scattered videos, you can use "Add Files." If the videos are all in the same folder, it is recommended to use "Import Files from Folder," which aligns better with the batch processing concept.
In the screenshot, 6 records have been added, with the list showing file names, paths, and extensions. File names include Video test 23.mp4, Video test 24.mp4, etc., and the extension column shows mp4, indicating that these files will all participate in the conversion as input videos. The record count displayed at the bottom of the list is 6, making it easy for users to confirm the imported quantity.

The purpose of this action is to gather the videos to be processed into one task list. The expected result is that all videos requiring conversion appear in the list. If the list is empty, it means files haven't been added successfully; if the record count is less than expected, you need to continue adding or re-import from the folder.
Step 3: Verify Names, Paths, and Extensions
The most feared problem in batch processing is "selecting the wrong batch of files." Therefore, before proceeding to the next step, you should check the list. The name column confirms whether the files are the target videos; the path column confirms the files are from the correct directory; the extension column confirms the current input format. In the screenshot, the path points to the Desktop Test folder 1 folder, and the extension is mp4, matching the example requirement of converting MP4 to MKV.
If a file is not needed for conversion, you can remove it using the delete operation on the right side of each record. If the entire batch of files was imported incorrectly, consider using the "Clear" button at the top to reselect. The interface also has "Filter" and "Sort" buttons on the right, which can help view the list when there are many files. As the screenshot only shows button names, specific filtering or sorting rules should be based on the actual software interface.
The purpose of this action is to reduce the error rate before formally starting processing. The expected result is that only the video files to be converted remain in the list, with the record count matching the actual plan.
Step 4: Click Next to Set the Save Location
After confirming the list is correct, click the "Next" button at the bottom of the page. The interface progress bar shows that Step 1 is "Select records to process," Step 2 is "Set save location," and Step 3 is "Start processing." Therefore, clicking Next will lead to settings related to the save location.
The save location determines where the converted MKV files will be stored. Although the screenshot does not show the detailed options for Step 2, it is reasonable to infer from the step name that users need to specify or confirm the output location at this step. It is recommended in actual operation to choose a clear output folder, such as creating a new MKV output directory next to the original folder. This way, the MP4s before processing and the MKVs after processing will not be mixed, making result checking more convenient.
The purpose of this action is to set the storage location for the batch conversion results. The expected result is that the software knows where to save the converted MKV files.
Step 5: Enter Start Processing and Wait for Completion
After setting the save location, continue following the software flow to enter "Start processing." After confirming the task information is correct, start the processing, and the software will perform batch conversion on the videos in the list. Compared to manual conversion, users do not need to repeatedly set the output format for each file, as the current function is explicitly for "Video to MKV."
During processing, it is recommended not to move or delete the original video files, nor to rename or move the output directory. Wait for the task to complete, then open the save location to view the conversion results. In the example, the processed files all have the .mkv extension, indicating that the batch conversion has achieved its goal.
Common Questions and Notes
Should I use "Add Files" or "Import Files from Folder" when importing files?
If video files are scattered in different locations, using "Add Files" is more flexible; if the videos are all in the same directory, using "Import Files from Folder" is more efficient. For batch conversion tasks, folder import usually reduces repetitive selections.
How to confirm whether the conversion was successful?
You can check from three aspects: first, whether files were generated in the output directory; second, whether the number of generated files matches the record count in the task list; third, whether the extension is .mkv. The before-processing screenshot shows MP4, and the after-processing screenshot shows MKV, which is the most intuitive comparison method.
Will the original MP4 files be affected?
The specific processing method depends on the actual save location setting of the software. For safety, it is recommended to save the output files to a new folder and keep the original MP4s. This way, even if the conversion results do not meet expectations, you can always re-process.
What should I pay attention to when there are many files?
Batch video conversion usually consumes significant disk space and processing time. Before starting, confirm that the computer has sufficient storage space, file paths are accessible, and videos are not occupied by other software. If there are very many files, you can first test the process with a few files before processing the complete folder.
Why use office software for video batch processing?
Many people habitually see video conversion as a task for a standalone tool, but in office scenarios, the real need is often batch file management. HeSoft Doc Batch Tool puts video format conversion in a unified software interface, suitable for managing together with other batch processing tasks like documents, images, and audio, reducing switching back and forth between multiple tools.
Summary: One Import, Unified Output to MKV for Multiple Files
The idea of converting multiple video files to MKV in one go is simple: select the right function, import files, verify the list, set the save location, and start processing. In the screenshot example, the user selects "Video to MKV" in the "Video Tools" of HeSoft Doc Batch Tool , adds 6 MP4 files to the list, continues processing according to the wizard, and finally obtains the corresponding MKV files.
If you are processing a batch of video materials, it is not recommended to convert them one by one. First, organize the videos to be processed into the same folder, then use the batch processing function to import them. This can significantly save time and reduce the risk of missing or mistakenly selecting files. For office users who frequently need to organize files, mastering this batch video format conversion method can make video material management more standardized and efficient.