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Base64 Encoder/Decoder

Encode and decode text or files using Base64

Reviewed: AnyCalc Editorial|2026-07-19|Editorial policy|About

What this calculator does

Base64 is a binary-to-text encoding scheme that represents binary data as a sequence of printable ASCII characters. Developers use Base64 encoding when they need to transmit binary data over channels that only support text, such as embedding images directly in HTML or CSS via data URIs, passing binary payloads in JSON APIs, or encoding authentication credentials in HTTP headers. This tool lets you encode plain text into Base64 and decode Base64 strings back to their original form instantly. It handles UTF-8 text with full Unicode support. Base64 increases data size by approximately 33%, so it is best used for small payloads rather than large file transfers.

How to use

  1. 01
    Paste your input
    Enter the text you want to encode or decode.
  2. 02
    Choose direction
    Select Encode or Decode mode.
  3. 03
    Get result
    Copy the converted Base64 string or decoded output.

Base64 Encoder/Decoder FAQ

What is Base64 encoding used for?▾
Base64 encoding converts binary data into ASCII text so it can be safely transmitted through text-based protocols. Common uses include embedding images in HTML/CSS via data URIs, encoding email attachments (MIME), passing binary data in JSON or XML payloads, and encoding credentials in HTTP Basic Authentication headers.
Does Base64 encoding provide encryption or security?▾
No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string back to its original form without a key. Never use Base64 to protect sensitive data. For security, use proper encryption algorithms like AES or RSA.
Why does Base64 increase the size of data?▾
Base64 represents every 3 bytes of binary data as 4 ASCII characters, resulting in approximately a 33% size increase. This overhead is the tradeoff for being able to safely transmit binary data through text-only channels.

Interpret carefully

Outputs are decision-support estimates, not a substitute for professional judgment.

  • Treating Base64 Encoder/Decoder output as a final professional diagnosis, quote, or legal determination
  • Entering approximate values when the result is sensitive to units or precision
  • Applying the FAQ answer (“What is Base64 encoding used for?”) to a special case without checking assumptions

Next steps

  1. Double-check inputs against your source documents (labs, statements, specs, or notes).
  2. Confirm the method below matches your use case before you act on the number.
  3. For medical, financial, or production decisions, verify with a qualified professional.

Disclaimer: Results are informational only and do not constitute medical, financial, legal, or professional advice. Report issues: sublimernj@gmail.com

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