Spreadsheets
Open Spreadsheets on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.
Page guide
Find the right tool and get straight to your task.
No account needed.XLSX viewer
Open an Excel or OpenDocument worksheet as a readable table.
Merge CSV
Combine CSV files and line up columns by their headers.
Excel to HTML
Turn an Excel worksheet into an HTML table.
Compare CSV
Find what changed between two CSV files.
Ods to XLSX
Move an OpenDocument spreadsheet into an Excel workbook.
Split excel
Give each worksheet its own Excel file.
CSV join
Join CSV tables using a column they have in common.
CSV pivot
Turn CSV rows into a grouped summary table.
About spreadsheets
These free spreadsheet tools help you open, combine and reshape workbook files without a full office suite. The XLSX viewer opens Excel files in your browser and shows formulas and values. Merge CSV and CSV join combine files, Compare CSV highlights changes between two versions, and CSV pivot summarizes rows into a quick report. Split excel breaks a workbook into smaller files, Excel to HTML turns sheets into web tables, and Ods to XLSX converts LibreOffice files.
Choose join or merge based on your data. Use Merge CSV to stack files that share the same columns, and CSV join to combine files that share a key such as an ID or email address.
Popular spreadsheets
Common questions
Are my spreadsheets uploaded?
No. The XLSX viewer, Merge CSV, Compare CSV, CSV join, CSV pivot and Split excel run in your browser. Your workbooks are processed on your device and are not sent to our server.
Does the XLSX viewer recalculate formulas?
It shows the formulas and the values that were saved in the workbook, so you can tell them apart. Results reflect the last time the file was calculated in a spreadsheet app. Open the file there if you need a fresh calculation.
What is the difference between Merge CSV and CSV join?
Merge CSV stacks rows from files that share the same columns into one longer table. CSV join matches rows across files by a shared key column, such as an ID, and adds the columns side by side.