Free online XLSX to ACCDB converter

Some Windows applications require a Microsoft Access database rather than an Excel workbook, and Access tables are better suited to relationships, controlled data entry, and saved queries. Converting the file imports spreadsheet data into an .accdb database; it does not preserve the workbook as an editable spreadsheet.

What the XLSX format is

.xlsx is the XML-based, ZIP-packaged workbook format used by Microsoft Excel 2007 and later. It stores worksheets, cell values, formulas, formatting, charts, tables, filters, and limited workbook metadata. Microsoft Excel creates it by default; LibreOffice Calc, Apple Numbers, and other spreadsheet applications can open or export it.

XLSX is designed for calculations and presentation-oriented data. A worksheet may contain merged cells, blank rows, multiple header rows, subtotals, formulas, formatting, and inconsistent values, so it is not automatically a properly structured relational table.

What the ACCDB format is

.accdb is the Microsoft Access database format introduced with Access 2007. One file can contain tables, queries, relationships, forms, reports, macros, indexes, validation rules, attachments, and VBA modules.

ACCDB is useful when data must be queried across related tables, edited through controlled forms, validated consistently, or used in saved reports. Access supports primary keys, foreign keys, indexes, and links to external data sources. An ACCDB file requires Microsoft Access or compatible database software and is not a spreadsheet format; older Access versions that support only .mdb cannot open it directly.

How to convert XLSX to ACCDB

Import the workbook with Microsoft Access

1. Make a copy of the workbook. In the copy, remove title rows, merged cells, multi-row headers, subtotal rows, and decorative columns that should not become database fields. Give the first row of each data range one unique column name.
2. Open Access and select File → New → Blank database. Enter a filename ending in .accdb, then select Create.
3. Select External Data → New Data Source → From File → Excel.
4. Browse to the XLSX file. Select Import the source data into a new table in the current database, then select OK.
5. Choose the worksheet or named range to import. Enable First Row Contains Column Headings when the first row contains field names.
6. Review Access's detected data type for every column. Change fields to text, number, date/time, currency, or another suitable type when inference is wrong. Keep one logical data type per column.
7. Choose a primary key. Select an existing column only when every value is unique and nonblank; otherwise let Access add an AutoNumber key and retain the original identifier in a separate field.
8. Enter a table name and select Finish. Import other worksheets separately, then define relationships through Database Tools → Relationships.

For repeatable imports, Access VBA can use DoCmd.TransferSpreadsheet acImport, acSpreadsheetTypeExcel12Xml, "TableName", "C:\Data\source.xlsx", True. Create the destination table first when fixed field types, indexes, and validation rules are required.

Convert without installing software

You can upload the workbook to 101convert.com, select the ACCDB output, and download the converted database without installing software. Inspect the resulting tables before use because an automated conversion may not create the intended field types, primary keys, relationships, or normalized structure.

Quality and compatibility limitations

• Worksheet formatting, charts, conditional formatting, images, pivot-table layouts, and most presentation features do not become Access table features.
• Excel formulas are normally imported as their current calculated results rather than equivalent Access expressions. Recreate calculations in Access queries, forms, or reports.
• Access infers field types from a sample of worksheet values. A mostly numeric column containing text, or a date column with inconsistent formats, can lose values, reject rows, or produce incorrect types. Check the import errors table and explicitly define types where accuracy matters.
• Each worksheet or imported range normally becomes one table. Access does not reliably infer normalization, primary keys, foreign keys, or relationships from spreadsheet layout; create those elements manually.
• Duplicate, very long, or punctuation-heavy column names can cause import and SQL problems. Use short, unique field names and avoid merged or multi-row headers.
• An ACCDB database has a 2 GB maximum file size, excluding linked external data. Large workbooks may need separate databases, linked tables, or a server database such as SQL Server.
• Access is primarily Windows desktop software. Confirm that the application consuming the database supports ACCDB and the required Access Database Engine version before distributing the file.