ConvertCSV

Converter tool

Base64 to CSV Converter

Decode Base64 text into a downloadable CSV table

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No output yet. Upload or paste input and convert.

Base64 to CSV Converter

APIs, config files, and email attachments sometimes wrap CSV as Base64 so binary-safe transport stays intact. This free Base64 to CSV converter decodes UTF-8 Base64 in your browser and parses the result as CSV.

Key features

  • UTF-8-safe decode with clear errors on invalid Base64.

About the Base64-encoded CSV text to CSV format

Whitespace in the Base64 string is ignored. The decoded bytes must be valid UTF-8 CSV text with a header row for best results.

Common use cases

  • Decoding a Base64 field from a JSON API response into Excel.
  • Recovering CSV from an encoded backup string.

How to use this tool

  1. Paste Base64 or upload a .b64/.txt file.
  2. Convert and download CSV.

Example

Input Base64

bmFtZSxjaXR5CkFkYSxMb25kb24=

Output CSV

name,city
Ada,London

Tips for best results

  • Use CSV to Base64 for the reverse path.
  • Strip data-URL prefixes if present (paste only the Base64 body).

Common pitfalls

Base64 of a binary .xlsx is not CSV — use Excel to CSV for workbooks.

Frequently asked questions

Is decoding uploaded to a server?

No. atob and CSV parsing run locally.

For more background on data formats and conversion workflows, read our format guides or browse the converter blog for step-by-step walkthroughs linked to each tool.