Loading data into a SQL database
A backend developer receives monthly reports as XLSX files and needs to import them into PostgreSQL. Converting to CSV first makes the database COPY command work without any additional parsing code.
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Convert Excel to CSV — Fast, Free, and Private Fast, Free, and Private
or drag & drop here
Supports .xlsx, .xls, .ods
This tool converts XLS and XLSX files to CSV format directly in your browser. It is built for developers, analysts, and anyone who works with spreadsheet data and needs a clean, universal CSV output without installing software or creating an account. Your file never leaves your device, and the result is ready to download in seconds.
- Converts XLS, XLSX, and ODS files to CSV format
- No upload required — conversion runs in your browser
- Files are never stored on our servers
- Commas and quotes inside cells are escaped automatically
- Download your CSV file in under ten seconds
- Works with multi-sheet Excel workbooks
- Free online with no hidden file-size limits
- Each sheet in a workbook becomes its own CSV file
Process
How to convert your XLS files to CSV in five steps
No software to install. The entire conversion runs inside your browser in seconds.
01
Upload your Excel file
Click the upload area or drag your XLS, XLSX, or ODS file onto the page. Your file stays in your browser and is never sent to any server.
02
Every sheet is read
If your workbook has several sheets, each one is converted separately, so a three-tab workbook gives you three CSV files.
03
Values become comma-separated text
Each row becomes one line with commas between the values. Cells that contain commas, quotes or line breaks are quoted the standard way, and the text is saved as UTF-8.
04
Check the result
The converter runs automatically and lists every CSV it created with its row count, so you can confirm that nothing is missing before you download.
05
Download your CSV file
Click download to save the CSV file to your device. For a workbook with several sheets, download every CSV at once or save individual sheets from the list.
About
What is a CSV converter?
A CSV converter transforms tabular data from a spreadsheet format — such as XLS or XLSX — into comma-separated values format, a plain text output that every database, programming language, and data tool can read. For anyone moving Excel data across systems, a reliable converter removes the manual step that slows every workflow down.
For best results, verify your source file has consistent column headers and no merged cells before converting. This ensures the CSV output maps correctly to your target system the first time.
Plain text, universal compatibility
CSV carries no proprietary encoding, so it works with Python, SQL, R, Google Sheets, and virtually every other tool that handles tabular data without requiring additional drivers or libraries.
Smaller file size than XLS or XLSX
CSV drops Excel-specific markup, styles, and metadata, resulting in significantly smaller files that are faster to transfer, easier to store, and simpler to manage in a version control system.
Correct quoting for tricky values
Cells that contain commas, double quotes or line breaks are wrapped in quotes and escaped, so a value like New York, NY stays in one column instead of splitting into two.
Formula results are written as values
The converter writes the evaluated result of each formula into the CSV output, not the formula string itself. Downstream scripts receive clean numeric or text values with no dependency on the Excel engine.
Multi-sheet workbooks handled
A workbook with several tabs produces one CSV per sheet, each named after its tab, so every sheet arrives as a separate file ready for import.
Handles files from any source application
XLS files from older Microsoft Office versions, modern XLSX files, and ODS files from LibreOffice all convert cleanly. Output format and encoding stay consistent regardless of which application created the source file.
Benefits
Why convert Excel to CSV?
CSV is the format that databases, APIs, and analytics platforms actually expect. Converting your Excel files to CSV removes the compatibility layer that slows down every import, integration, and automated pipeline that touches spreadsheet data.
1
Database imports need CSV, not XLSX
Most SQL databases, cloud data warehouses, and ETL tools accept CSV natively. Starting with a CSV file removes the extra conversion step that XLSX imports almost always require.
2
Smaller size improves transfer speed
CSV files carry only raw values and delimiters. Stripping Excel formatting dramatically reduces file size, cutting transfer time for large datasets shared over APIs or slow connections.
3
Version control works well with CSV
Git and similar tools show meaningful diffs for plain text files. Storing CSV instead of binary XLS makes changes reviewable and reversible in any standard code repository.
4
Scripts parse CSV without extra libraries
Python, Node.js, and R all include CSV readers in their standard libraries. Reading an XLSX file requires installing and maintaining additional dependencies that CSV simply does not need.
5
Cross-platform reading is guaranteed
Any operating system opens a CSV file with a plain text editor. XLSX files need Excel or a compatible viewer — CSV has no such requirement and works everywhere without configuration.
6
Compression keeps archive sizes minimal
CSV compresses extremely well with gzip or zip because repeated text patterns reduce efficiently. Archiving large datasets as compressed CSV can reduce long-term storage costs significantly.
Use cases
Who uses an Excel to CSV converter?
Real situations where converting XLS or XLSX files to CSV solves a direct, practical problem without workarounds.
Feeding Excel data into Python scripts
A data analyst uses pandas to process spreadsheet exports from a CRM. Converting XLSX to CSV removes the openpyxl dependency and makes the script run faster on files with hundreds of thousands of rows.
2
Uploading records to accounting software
An accountant needs to import transactions from an Excel spreadsheet into accounting software that only accepts CSV. The converter handles the file in seconds with no manual reformatting required.
3
Importing contacts into a CRM platform
A marketing coordinator has a contact list in XLSX format and needs to upload it to HubSpot or Salesforce. Both platforms require CSV for bulk import, making conversion a necessary first step every time.
4
Loading vendor reports into a warehouse
An engineer receives XLSX reports from a supplier every week. Converting each sheet to CSV gives files that bulk-import tools and SQL COPY commands load without extra drivers.
5
Sharing student data across platforms
A school administrator exports grade data from one system as XLSX and needs to import it into another that only reads CSV. The converter handles the format change without altering any values.
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Compare
CSV vs XLSX — which to use?
Both formats have a clear role. The right choice depends on what you need to do with the data after you have it.
VS
Recommended for transfer
CSV format
- Works with every database, API, and analytics tool without extra libraries or proprietary drivers installed.
- Plain text makes the file readable in any editor and produces meaningful diffs in version control systems.
- Smaller file size after stripping formatting means faster uploads and lower storage costs at scale.
Best for authoring
XLSX format
- Stores multiple sheets, formulas, charts, and cell formatting that CSV format cannot represent at all.
- Native format for Microsoft Excel and spreadsheet software used across most office environments today.
- Preserves cell-level data types — dates, currencies, percentages — without ambiguity or inference required.
Use XLSX while building and editing. Convert to CSV when data needs to move to another system. Keep both — the XLSX as the source of record, the CSV as the transfer format.
Privacy
Your files stay private and secure
Processed entirely in your browser
Conversion runs in JavaScript on your own device. Your Excel file is never uploaded to any server, so there is no transmission risk even for sensitive or proprietary data.
No data stored after you download
Once you download your CSV file, the in-memory copy is cleared immediately. Nothing is written to disk on our end — your file exists only in your browser's memory during conversion.
Nothing is sent over the network
Your browser reads the file straight from your device. No part of the spreadsheet is transmitted, so there is no upload to secure and no server copy to delete.
No account and no file logging
This tool needs no login or account, and the names and contents of your files are never recorded.
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Why this converter
Everything you need in one CSV converter
Six reasons developers and analysts choose this tool over built-in spreadsheet export options.
Does your file convert in under ten seconds?
The converter processes XLS and XLSX files directly in your browser, so there is no upload wait time. A clean CSV file is ready for download almost instantly, even for large spreadsheets with thousands of rows.
Does every sheet get converted?
Yes. Multi-sheet workbooks are fully supported: each sheet is saved as its own CSV file, named after the workbook and the sheet tab, so you never have to split the workbook by hand.
Standard comma-separated output
Values are separated by commas, and any cell containing a comma, double quote or line break is wrapped in quotes. That is the format Excel, Google Sheets, databases and Python's csv module all read correctly.
Formula values are preserved, not broken
Excel formula results are written as plain values in the output CSV file. No broken references, no errors — just clean data your database, script, or import tool can read without any additional processing.
Works with files from any spreadsheet software
Export from Microsoft Excel, LibreOffice Calc or any spreadsheet app that saves XLS, XLSX or ODS files. The converter accepts all three and produces consistent CSV output every time.
Every sheet converted in one go
A workbook with several tabs is converted in a single step. Download all the CSV files at once, or pick only the sheets you need from the list.
✓ CSV converter is free and works in any browser✓ No account or signup needed✓ Files never leave your browser✓ Nothing stored on any server✓ Handles XLS, XLSX and ODS files✓ Works on mobile and desktop browsers✓ Open source processing library✓ GDPR-compliant privacy handling
FAQ
Common questions answered
Everything you need to know before converting your first file.
Yes. The converter is completely free, with no signup and no limit on the number of conversions. Because the work happens in your browser, the only size limit is your device's memory.
Yes. Every sheet in the workbook is converted to its own CSV file, named after the original file and the sheet tab. After conversion you can download all of them or only the sheets you need.
No — and that is intentional. CSV files have no concept of formulas. The converter writes the evaluated result of each cell into the output. If a formula calculated 1500, the CSV contains 1500. This is the correct behavior for any data import or transfer use case.
The converter automatically wraps any field containing a comma in double quotes, which is the standard CSV escaping method. A value like New York, NY becomes "New York, NY" in the output, so it stays in one column.
Yes. The tool handles both the legacy XLS binary format and the modern XLSX format. Upload your file, adjust any settings, and download your CSV file in seconds — no account required, no software to install, and no cost.
UTF-8, which covers Latin, Cyrillic, Arabic, Chinese, Japanese and other scripts. Databases, Google Sheets and most programming languages read it correctly. If Excel shows garbled accents when you double-click the file, open it through Data > From Text/CSV and choose UTF-8.
CSV holds plain values only, so colours, fonts, borders and column widths are dropped. A merged cell's value is written to its first cell and the rest of the merged range is left empty.
No. The conversion runs in your browser, so the file never leaves your device and there is nothing on our side to store or delete.
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