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Cifrivo
Developer

Base64 decode to text

Decode Base64 into readable UTF-8 text locally, with strict validation for malformed input and invalid text bytes.

Processed locallyYour files never leave your device.

Everything is processed locally in your browser.

How it works

  1. Paste the Base64 value, with or without whitespace.
  2. Press Decode.
  3. Review the UTF-8 text result or the validation error.
  4. Copy or download the decoded text.

Practical example

Q2lmcml2byDinJM= decodes to Cifrivo ✓. The decoder understands Unicode because it validates the decoded bytes as UTF-8.

Formula and explanation

The decoder first validates the Base64 alphabet and padding, then reconstructs the original bytes. Whitespace is ignored so wrapped MIME-style input still works.

Those bytes must represent valid UTF-8 for this text-focused tool. A binary image or archive may be valid Base64 but is not readable text; use Base64 to Image for supported image data instead.

Decoding is not decryption and cannot recover information protected by a real cipher. All work happens locally, and neither the encoded value nor decoded content is sent to analytics.

Frequently asked questions

Why can valid Base64 fail as text?

Base64 can contain any bytes. This tool additionally requires those bytes to be valid UTF-8 text.

Can I paste Base64 with line breaks?

Yes. Spaces, tabs and line breaks are removed before validation.

Can Base64 contain a virus?

It can represent arbitrary bytes. This page only displays valid text and does not execute it.

Developer

Base64 encode

Encode Unicode text as Base64 instantly, then copy or download the result locally.

Developer

Base64 to image

Validate Base64 or a Data URI, detect its image type, preview it and download the file.

Developer

Image to Base64

Turn JPG, PNG, WebP or SVG images into raw Base64 or a ready-to-use Data URI.