Boomie
Free online converter

XLSX to CSV converter

Convert XLSX to CSV online for free. Fast and without sign-up — upload a file and download the result.

Also available in Russian.

How to convert XLSX to CSV

This conversion is useful when the task changes the file type: for example, extracting content, producing a document to send, or preparing a file for a service that only accepts CSV. People often convert XLSX to CSV before sending a file to a client, publishing it on a website, archiving it or opening it on another device.

Data conversion is about correct structure and a readable result. Check delimiters, encodings and nested fields before use. If the source and target formats support different features, the result may be simplified: for example transparency, animation, complex layout or embedded objects.

Quality, speed and limits

CSV files are commonly used for spreadsheets, APIs, imports, exports, configuration files and reports.

Boomie works without registration. Images (PNG, JPG, WEBP, HEIC) and audio (MP3, WAV) are converted right in your browser — the file never leaves your device. Documents, video and other heavy formats are processed on the server as temporary jobs. Large files may take longer.

How it works

Three simple steps

Upload a file

Drag and drop your XLSX file or choose it from your device.

Start the conversion

Check that the target format is CSV and press Convert.

Download the result

Save the finished CSV file. Batch results can be downloaded as a ZIP.

FAQ

Frequently asked questions

Is it safe to convert XLSX to CSV?

Yes. Images and audio can be converted right in your browser — the file never leaves your device. Other formats are processed on the server and are not stored permanently.

Does converting XLSX to CSV reduce quality?

Data conversion is about correct structure and a readable result. Check delimiters, encodings and nested fields before use. The result also depends on the source file and compression settings.

Is the XLSX to CSV converter free?

Yes. Conversion is free and requires no sign-up.

Can I convert large XLSX files?

Large files are generally supported, but processing takes longer. Server-side conversions have size and timeout limits.

Do you store uploaded files?

No. Boomie does not keep a file library. Images are processed in the browser, and server-side conversions run as temporary jobs.

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