Open an XLSX file without Excel
See every sheet in a workbook, switch between them, and take the one you need away as a CSV. Your file is opened on your own device.
This opens a workbook so you can read it. To reshape the data instead — CSV into JSON, or back — use the JSON & CSV Converter.
How it works
Choose your workbook
The file is opened from your device in this tab. It is not sent anywhere.
Switch between sheets
Every sheet in the workbook is listed. Sheets that are hidden in Excel are marked rather than dropped.
Read the grid
Values, dates and numbers appear as Excel formatted them. Saved results of formulas are shown; nothing is recalculated.
It is processed on your machine
This is the kind of content people are most nervous about pasting into a website. Here nothing is transmitted: your browser reads the input, the tool works on it in the tab, and the result is handed straight back. Close the tab and it is gone.
- Opened from your disk by your browser — not sent anywhere first.
- Held in the tab while the tool works, then dropped.
- Saved to your device by your browser, not by a link to a server.
- Closing the tab clears the working copy completely.
- No account, so nothing is ever attached to an identity.
- No tracking of what you worked on or what was inside the file.
There is no queue and no retention policy to read. Whatever you pasted is released the moment the tab closes. See how your data stays inside the tab for the full picture, or follow the DevTools check to verify your file never leaves.
What people use it for
Reading a spreadsheet on a machine without Excel
Chromebooks, locked-down work laptops and personal machines often have no copy of Excel. This opens the workbook anyway.
Checking something before you ship it
A quick pass in the browser is faster than wiring up a build step for a one-off job.
Working on a machine you do not control
Because nothing is transmitted, it is safe to use on a shared or locked-down computer.
Handling data you are not allowed to upload
Customer records, keys and internal names often may not leave the organisation at all. Here they do not.
Formats & limits
What this tool accepts, what it produces, and what it will never ask you for.
- Input
- XLSX and XLSM workbooks up to 50 MB
- Output
- A CSV file of the sheet you are looking at
- Maximum file size
- 50 MB per workbook
- Files per run
- One at a time
- Sign-up required
- None
- Watermark
- Never added
- Works offline
- Yes, once the page has loaded
- Supported browsers
- Any current Chrome, Edge, Firefox or Safari
When something goes wrong
Invalid input stops with a plain message that points at the exact problem, rather than a spinner that never finishes.
The content is not in the shape this tool expects. Check for a missing bracket or an extra character and try again.
Why not an online service
A hosted version of this tool means your input is transmitted to a server you have no relationship with. Removing that step removes the whole category of risk.
A typical upload site
This tool
Questions
Which Excel files can I open?
Workbooks saved as .xlsx and .xlsm. Older .xls files and binary .xlsb files are not supported — open them in Excel and use Save As to make an .xlsx copy, and it will open here.
Is there a file size limit?
Yes — 50 MB. A spreadsheet expands considerably once it is opened, so a larger file needs more working space than a browser tab usually has. Very large workbooks are better opened in Excel.
Can I open a password-protected workbook?
No. A protected workbook is scrambled in a way that cannot be unscrambled in a browser. Open it in Excel and save a copy without a password, then open that copy here.
Are formulas recalculated?
No. You see the result Excel saved in the file the last time it was saved. If a formula was never calculated, its cell appears blank.
Why does a date show as a number?
Excel stores dates as numbers and applies a format to display them. When a cell holds a number that was never given a date format, this tool shows the number, because that is what is in the file.
Will the CSV open correctly in Excel?
Yes. It is saved as UTF-8 with the small marker Excel needs to read accented characters and other non-English text correctly. If a search filter is active when you export, only the matching rows are included.