Want to batch convert Excel files to HTML files?
Try Withdata Data File Converter, a desktop Excel to HTML converter for Windows, MacOS, and Linux, Bulk convert Excel to HTML, Easy and Fast.
- Can run in GUI mode, Step by Step, just a few mouse clicks.
- Can run in Command line, for Scheduled Tasks and Streams.
- Convert files locally and privately, avoid uploading large Excel file(s) to online services.
- Support Windows, Linux, and macOS.
Download Withdata DataFileConverter 
Batch convert Excel files to HTML tables
Select source Excel files -> Set HTML files -> Convert Excel files to HTML tables
Click “Start a New Convert” at task dialog.
then show the wizard.
Select From “Files” “Excel” To “Files” “Html”.
1. Select source Excel files.
And config the first source Excel file.
2. Config target HTML files.
3. Summary.
List source Excel files.
4. Convert Excel files to HTML tables.
After converting, you can view output HTML tables.
More about Excel to HTML converter
Download Withdata DataFileConverter
See also:
EXCEL → HTML reference
Type mapping
| Value kind | in EXCEL | in HTML |
|---|---|---|
| Int | 1234 (a real numeric cell) | <td>1234</td> |
| Bigint | 9007199254740993 (exact only while the cell stays text) | <td>9007199254740993</td> |
| Decimal | 1234.56 (numeric cell, format controls the displayed decimals) | <td>1234.56</td> |
| Float | 1.234E+10 (numeric cell) | <td>1.234e+10</td> |
| Text | text cell; leading zeros survive only if the column is text | <td>text</td> |
| Long text | text cell; wraps inside the cell rather than the row | <td>multi-line text</td> (entities for & <) |
| Date | a serial number plus a date cell format | <td>2026-09-18</td> |
| Datetime | a serial number plus a date-time cell format | <td>2026-09-18 14:30:00</td> |
| Binary | not representable as data | not representable in a cell |
| Boolean | TRUE / FALSE (a real boolean cell) | <td>true</td> |
| JSON | a text cell; the quotes are part of the value | <td>{"a":1}</td> (quotes escaped) |
Dialect differences
Both EXCEL and HTML are file formats, so what differs below is how each one chooses to represent a value.
| Property | in EXCEL | in HTML |
|---|---|---|
| identifiers | Not applicable; a cell holds exactly one value | Attribute values in quotes; entities for reserved characters |
| dates | Stored as a serial number; only the cell format makes it lo... | Whatever text was rendered |
| binary | Only as text or an embedded object, not as a data column | data: URIs inside src attributes |
| separator | Cells, not delimiters | Tags, not delimiters |
| encoding | UTF-8 internally, declared in the package | Declared in a meta charset tag or the HTTP header |
| typing | Real cell types: text, number, date, boolean, error | None |
| shape | Multiple sheets, each a flat grid | Free form; tables are row/column structures inside markup |
| ceiling | 1,048,576 rows x 16,384 columns per sheet; 255 sheets per w... | No formal limit |
Data File Converter without the manual work
For batch jobs, large files and scheduling use the Data File Converter converter — an offline desktop app for Windows, Linux and macOS. Free trial.
