#168 · CSV & Delimited Files Tool

CSV UTF-8 Converter

Read a CSV or TSV file with a chosen source encoding and create a clean UTF-8 delimited file.

Office File Tool

Convert encoding
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How to use this office tool

  1. Upload a CSV or TSV file.
  2. Choose the source encoding with the format control.
  3. Process and inspect decoded rows.
  4. Download the UTF-8 output.

What this tool does

The delimited text is decoded with the chosen character set and exported as UTF-8 with a BOM for broad spreadsheet compatibility.

source bytes → decoded text → UTF-8 bytes

The exported file is newly generated in your browser. The uploaded source remains unchanged.

Supported formats

XLSX, XLS, CSV, and TSV are accepted. Browser rewriting does not guarantee preservation of macros, charts, pivots, external links, or every advanced Excel feature.

FormatUse
XLSX / XLSWorkbook input; XLSX output
CSV / TSVDelimited table input

Tips for better results

  • Choose the correct source encoding for readable characters.
  • The delimiter is detected from the extension.
  • Review dates and long IDs as text.

FAQ

Why add a UTF-8 BOM to the CSV?

The BOM helps several desktop spreadsheet programs recognize UTF-8 text and display non-ASCII characters correctly.

Can this fix text decoded with the wrong source encoding?

Yes when the correct source encoding is selected before conversion; the preview should be checked for replacement characters.

What spreadsheet formats can CSV UTF-8 Converter read?

It accepts XLSX, XLS, CSV, and TSV files. Advanced workbook objects may not be preserved when a new workbook is written.

Are uploaded files sent to a server?

No. Parsing and output generation run locally in the browser; the page does not upload cell data.

How should I protect IDs and leading zeros?

Keep identifier columns formatted as text and enable text protection when available. Always check the preview before exporting.

Processing safeguards

CheckBehavior
PrivacyLocal browser processing
PreviewLimited to 5–100 rows

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