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Base64 Encode & Decode Text Online

Instant on-device convert

Encode or decode Base64 text locally with proper UTF-8 handling—handy for tokens, data URLs, and debugging payloads.

Direction

All conversion runs locally in your browser—nothing is uploaded.

Drop a Text file, or browse

Accepts Text · max 5.00 MB · private client-side convert

Browse files
Size budget0 B / 5.00 MB

Plain-English guide

Terms & how it works

Confused by a field? Read the short definitions here while you use the tool.

  • text

    UTF-8 string

    Human-readable input or decoded output.

  • bytes

    Byte array

    UTF-8 representation used for Base64.

  • b64

    Base64 string

    ASCII-safe encoded form of the bytes.

When to use this Base64 ↔ Text

Common use cases

  • Transform sample payloads without uploading sensitive data
  • Move between JSON, CSV, YAML, XML, or Base64 quickly
  • Clean developer workflow conversions in the browser

Localized examples

  • UTF-8 text and spreadsheet-friendly CSV output
  • Config file migrations for local projects

What you get

  • Client-side conversion — files stay private
  • Bidirectional transforms where supported
  • No sign up, instant result

How to Convert Base64 ↔ Text Step-by-Step

  1. 1Choose Text → Base64 or Base64 → Text.
  2. 2Paste text or drop a plain-text file.
  3. 3Convert to encode or decode instantly.
  4. 4Copy the result or download it as a file.
  5. 5Clear when switching between encode and decode.

Governing formula

Base64(UTF-8(text)) ⇄ text

Encoding turns UTF-8 bytes into Base64. Decoding reverses the process with atob + TextDecoder after whitespace cleanup.

Use the defaults, then adjust one input at a time to see the result update instantly—no sign up.

Variable definitions

  • text

    UTF-8 string

    Human-readable input or decoded output.

  • bytes

    Byte array

    UTF-8 representation used for Base64.

  • b64

    Base64 string

    ASCII-safe encoded form of the bytes.

  • Never paste production secrets into shared machines.
  • Padding errors surface as Invalid Base64 messages.

Frequently Asked Questions

Yes. Text is encoded with TextEncoder before Base64, so emoji and non-Latin scripts survive the round trip.

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Community

Reviews & Ratings

See what others think about this tool, then leave your own rating to help improve CalculioHub.

4.8

out of 5.0

4 reviews

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Your rating

Aisha K.

Mar 12, 2026

Clean layout and the results update instantly. Exactly what I needed for a quick planning check.

Daniel R.

Feb 28, 2026

Very usable on mobile. Would love a save/export option later, but the math feels solid.

Priya S.

Feb 3, 2026

The FAQ section answered my questions before I even had to search. Smooth dark mode too.

Marcus L.

Jan 19, 2026

Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.

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