How to use Excel to CSV
- 1
Open the Excel to CSV converter
Go to tools.slaytic.com and open the Excel to CSV tool. No sign-up or account required.
- 2
Drop your .xlsx file
Add the workbook. The first sheet is the one exported.
- 3
Download the CSV
Save the plain text result, ready to import into a database, script or another system.
How this works in your browser
An .xlsx file is not a single document but a zipped bundle of XML describing sheets, shared strings, styles and calculated values. A JavaScript spreadsheet library unpacks that structure in your browser and reads the first sheet’s cells, then writes them out as delimited text with fields containing commas, quotes or line breaks escaped according to the CSV convention. Everything that made the file a spreadsheet is discarded in the process: formulas become their last calculated values, and formatting, colours, merged cells and multiple sheets have no representation in a format that is fundamentally rows of text. That reduction is precisely why CSV imports into practically anything.
Excel to CSV vs. traditional online converters
| Feature | Excel to CSV (in-browser) | Traditional online converters |
|---|---|---|
| File upload required | No - never leaves your device | Yes - file is sent to a server |
| Processing queue | None - starts instantly | Often, especially at peak times |
| Watermark on output | Never | Common on free plans |
| Usage limits | None - free, unlimited use | Often capped per day or file size |
| Works offline once loaded | Yes, for most tools | No - requires a live connection |
| Account required | No | Often, for anything beyond a trial |
Who uses Excel to CSV
Database and system imports
Produce the format most import tools and bulk upload forms actually expect.
Feeding scripts and pipelines
Give a script plain text it can read without a spreadsheet library.
Sharing data without Excel
Send tabular data to someone who has no spreadsheet software installed.
Version control friendly data
Store tabular data as text that shows meaningful line-by-line differences.
Frequently asked questions
What happens to multiple sheets?
The first sheet in the workbook is exported. To convert other sheets, use the Excel Splitter first, then convert each split file individually.
Are formulas preserved?
No. CSV has no concept of formulas, so cells are exported as their calculated values.
What happens to cell formatting and colours?
CSV is plain text only, so formatting, colours, and styles are not preserved, only the raw data.
Will my leading zeros survive?
They survive the export, since the CSV is written as text. What destroys them is opening that CSV back in Excel, which interprets 00123 as the number 123 and drops the zeros. Postcodes, product codes and account numbers are the usual casualties. Import the file rather than double-clicking it, and set the column to text during import.
How are dates written out?
As the displayed value rather than Excel’s internal date number, so what you saw in the cell is what lands in the file. Be aware that a date displayed in one regional order can be read back in another, which is the classic way day and month end up swapped between systems.
What if my data contains commas?
Those fields are wrapped in quotes, which is the standard CSV convention, so an address or a description containing commas stays in one column rather than spilling across several.
Is my spreadsheet uploaded anywhere?
No. The workbook is parsed and the CSV written inside your browser tab.