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.
1
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
- Custom delimiter support — comma, tab, semicolon, or pipe
- Download your CSV file in under ten seconds
- Works with multi-sheet Excel workbooks
- Free online with no hidden file-size limits
- API access available for automated batch conversion
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
Choose the sheet you want to export
If your Excel workbook has multiple sheets, pick the one you need from the dropdown menu. Select all sheets to export each one as a separate CSV file.
03
Set your delimiter and encoding options
Choose a delimiter — comma is the default — and select your output encoding, typically UTF-8. Toggle whether the first row should be treated as a column header.
04
Click convert and check the preview
The converter runs automatically and shows a real-time preview of the first rows. Verify column alignment before you download the finished file.
05
Download your CSV file
Click download to save the CSV file to your device. For recurring or high-volume needs, use the API to convert your XLS files programmatically without visiting the page.
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.
Delimiter flexibility for every system
The default comma works for most cases, but semicolons, tabs, and pipe characters are also valid. Choosing the right delimiter prevents misaligned columns when your data already contains commas.
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.
API integration for automated pipelines
The API endpoint accepts XLSX files and returns CSV in real-time, making it straightforward to automate conversions inside an ETL job, data pipeline, or any application that processes spreadsheet files at scale.
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
Automating exports through the API
An engineer builds an ETL pipeline that receives XLSX files from a vendor system and converts them to CSV automatically using the API, enabling ingestion into a data warehouse without manual steps.
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.
6
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.
Advanced encryption for all API transfers
API requests use TLS with advanced encryption in transit. Files sent via the API are processed in secure data centers and deleted immediately after the CSV response is delivered.
No account, no tracking, no logging
This tool requires no login or account creation. No file names, metadata, or usage patterns tied to your identity are recorded at any point during the conversion process.
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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.
Can you choose which sheet gets converted?
Multi-sheet Excel files are fully supported. Select the specific sheet you need before conversion, or export every sheet as a separate CSV file in one step without opening the workbook manually.
Custom delimiter setting for any system
Not every platform expects a comma. Choose your delimiter — comma, semicolon, tab, or pipe — before the conversion runs so the CSV output matches your target format exactly without post-processing.
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, Google Sheets, or any other spreadsheet software. The converter handles XLS, XLSX, ODS, XML, and HTML table formats and produces consistent CSV output every time.
API access for automated batch conversion
Need to convert files at scale? The API lets you send XLS or XLSX files programmatically and receive CSV output in real-time, making integration with your data pipeline straightforward and reliable.
✓ CSV converter is free and works in any browser✓ No account or signup needed✓ Advanced encryption for API transfers✓ Files deleted immediately after conversion✓ Secure data centers for API processing✓ 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 browser-based converter is completely free with no signup, no file-size cap, and no limit on the number of conversions. API access for automated and high-volume use is available on a separate plan with usage-based pricing.
Other converters you might need
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