ConvertWhat happens when you convert XLSX to YAML
- All sheets are converted.
- Formulas are saved as their last calculated values; formatting, charts and merged cells aren't carried over.
- Each row becomes an item with the header row as keys; columns named like “address.city” become nested keys.
- Numbers, true/false and dates keep their types. Text YAML would misread (yes, no, 007…) is quoted automatically.
XLSX vs YAML
| Feature | XLSX | YAML |
|---|---|---|
| Multiple sheets | Yes | Yes |
| Formulas | Yes | No |
| Numbers & dates | Yes | Yes |
| Nested data | No | Yes |
| Best for | Spreadsheets with several sheets | Config files, data |
How to convert XLSX to YAML
- Drop your XLSX files on the box above, or click it to choose files. You can add many at once.
- Adjust the options if you want. The defaults work well for most files.
- Click Download for each YAML file, or "Download all" to get a ZIP.
Frequently asked questions
Is it safe to convert my files here?
Yes. Conversion happens entirely in your browser. Your files are never uploaded to a server, so nobody else can see them.
Is it free? Are there limits?
It's completely free, with no sign-up, watermarks or daily limits. The only limit is your device's memory for very large files.
Can I convert many XLSX files at once?
Yes. Drop as many files as you like; they're converted one after another and you can download them all as a ZIP.
What happens to formulas and formatting?
Each formula is saved as its last calculated value. Cell values, numbers, dates and text are kept; formatting, charts and merged cells aren't.
What about workbooks with several sheets?
Every sheet is converted and kept in the YAML file.
How is nested data handled?
Nested objects and elements become columns with paths like address.city (JSON) or author/name (XML), and converting back rebuilds the nesting.
Which YAML parsers can read it?
It's standard YAML that reads correctly in YAML 1.1 and 1.2 parsers, including PyYAML, js-yaml, Ruby, Kubernetes and GitHub Actions.