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b64=

Base64 Encoder/Decoder

100% Free

Encode plain text to Base64 or decode Base64 back to text — Unicode-safe, instant, browser-only.

Unicode Safe
Encode & Decode
Instant
Client-Side
SGVsbG8sIFdvcmxkIQ==
Output length: 20 characters

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  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/base64-encoder/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Base64 Encoder/Decoder">
</iframe>

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How to Use

  1. 1 Select the Encode tab to convert plain text to Base64, or Decode to reverse it
  2. 2 Type or paste your input text into the left panel
  3. 3 The encoded or decoded result appears instantly in the right panel
  4. 4 Click Copy to copy the output, or use Swap & Flip to reverse the operation with the current output

Features

  • Unicode-safe encoding using TextEncoder/TextDecoder (handles emojis and non-ASCII text)
  • Instant encode and decode with no button click needed
  • Swap & Flip button to reverse the operation using current output as new input
  • Output length shown for quick size comparison
  • Monospace font for easy reading of encoded strings
  • 100% browser-based — text never leaves your device

Why it Matters

Base64 encoding is everywhere in web development — email attachments, JWT tokens, data URIs, API payloads, and configuration files. Having a reliable, Unicode-safe encoder/decoder that works without installing anything saves time and catches encoding bugs instantly.

★★★★★

Use Cases

API Development

Encode credentials or payloads in Base64 for API authentication

JWT Inspection

Decode JWT token headers and payloads for debugging

Data URIs

Encode images or files to Base64 for inline embedding

Configuration Files

Encode secrets and config values stored in env files

Frequently Asked Questions

What is Base64?
Base64 is an encoding scheme that converts binary data into a text string using 64 printable ASCII characters. It is commonly used to transfer data in text-based systems.
Why use Base64 encoding?
Binary data can get corrupted when passed through systems that only handle text (like email or HTTP headers). Base64 ensures safe transmission.
Does it support Unicode and emojis?
Yes. The encoder uses TextEncoder to convert text to UTF-8 bytes first, making it fully Unicode-safe — unlike simple btoa() calls.
What does 'Swap & Flip' do?
It copies the current output into the input field and toggles the mode — so you can immediately reverse the last operation.

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