MDB File Extension
Microsoft Access Database
- File Type mdb
- Developer Microsoft
- Popularity
- Application Microsoft Access
- Category Data Files, Database Files, Blocked Email Attachment Files
- Format Binary
What is a MDB file?
The MDB extension is used by Microsoft Access Database and falls under the categories of Data Files, Database Files and Blocked Email Attachment Files, covering 6538 files.
Microsoft, the developer of the Microsoft Access Database (MDB), has released file format and 242 programs designed to handle them.
MDB files are compatible with various operating systems, including Windows, Mac OS and Linux. There are 12 programs available to open a MDB file, including popular tools like Microsoft Access, ACCDB MDB Explorer and Access Database Manager.
File Signature
HEX code: 00 01 00 00 53 74 61 6E 64 61 72 64 20 4A 65 74 20. ASCII code: Standard Jet DB.
Programs that support MDB files
Windows
Mac OS
How to open a MDB file?
If you are having trouble opening a MDB file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.
Microsoft Access, ACCDB MDB Explorer and Access Database Manager are among the most widely used programs for handling MDB files. To set up the newest version of Microsoft Access on your device, simply go to the official Microsoft website. There you can download the edition compatible with every operating system.
Once setup is done, your operating system should assign Microsoft Access as the default app for MDB files.
Set Microsoft Access as the default MDB handler
Choose an app to open a file on Mac
- Right click or use Control + left click on the desired MDB file to launch the file options menu;
- Choose "Open in Application" and click "Other";
- Scroll down to the bottom of the window, where you will find the "Enable" menu. Default, "Recommended Programs" will be selected;
- In this menu, choose "All Programs" and navigate to Microsoft Access. Check the box next to "Always open in app" to make it the default program.
Change default programs in Windows
- To get started, right-click your MDB file, then choose "Open With" and select "Choose Another Application" from the context menu;
- In the pop-up window, find and select the Microsoft Access application from the available options;
- Make sure the "Always use this app" checkbox is checked and click "OK" to confirm your choice as the default app for opening MDB files.
How to edit a MDB file?
To modify MDB files, it is necessary to install dedicated software that lets you open and edit data files. Online MDB editors generally offer fewer tools compared to programs designed for Microsoft Access Database.
Best MDB Editor Software in 2026
Following these criteria, we have put together a list of recommended MDB editors.
| MDB Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| ACCDB MDB Database Pro | John Li | Mac OS | 4.7 out of 5 (45 reviews) |
| Microsoft Access | Microsoft | Windows | 4.7 out of 5 (38 reviews) |
| Access Database Manager | John Li | Mac OS | 4.5 out of 5 (45 reviews) |
| Microsoft Excel | Microsoft | Windows, Mac OS, Apple iOS, Android | 4.4 out of 5 (39 reviews) |
| ACCDB MDB Explorer | GrandSoft | Mac OS | 4.3 out of 5 (47 reviews) |
Convert files to and from MDB
If you struggle with a MDB file, consider converting it to alternative formats such as PDF, CSV, XPS, XLS, DBF or other similar file types.
It is important to understand that converting a MDB file might limit certain functions, but this conversion is usually reversible.
Microsoft Access are offline tools that convert MDB files to other formats seamlessly and without quality loss.
Convert MDB to other file formats
Converting Files to MDB Format
Effective solutions for MDB file problems
If you encounter issues with MDB files, don’t worry—most can be fixed with minor software adjustments. Refer to the troubleshooting tips below.
What are the steps to repair a damaged MDB file?
Launch MS Access Database Recovery, Advanced Office Repair or Advanced Access Repair and open the damaged MDB file. Then, choose the "Repair" option from the menu. Wait for the recovery process to finish, allowing automatic repair of damaged data files.
How can I determine if my MDB file is damaged?
The signs of corrupted MDB data files can manifest as:
- The file stops responding or freezes in Microsoft Access or other programs;
- Error notifications appear during file manipulation;
- The file does not respond or shows errors when opening it;
- Unexplained MDB file size inflation;
- The file shows slow performance when edited in Microsoft Access;
What are the reasons behind Microsoft Access crash?
Insufficient software updates are a likely cause of Microsoft Access crashes. Be sure to install the latest updates for Microsoft products.
Restarting your computer can resolve numerous common problems, so it should be the initial step before changing any software-related settings.