Base64 Encoder and DecoderEncode and decode text locally
en

AppHelp

Encode and decode Base64 without uploading text

Paste text or Base64, switch modes, copy the result, and keep the whole conversion in the browser.

Converted output
SGVsbG8gQXBwSGVscA==

Quick answer

Base64 converts binary or text data into an ASCII-safe representation that can travel through JSON, URLs, email, and configuration files. This tool encodes UTF-8 text to Base64 and decodes Base64 back to readable text locally in the browser.

How to use

  1. 1. Choose encode or decodeUse encode mode for plain text that needs a transport-safe representation. Use decode mode for a Base64 value copied from an API, config, token payload, or log.
  2. 2. Paste the inputPaste text or Base64 into the input field. Unicode text is converted through UTF-8 so non-ASCII characters can round-trip.
  3. 3. Copy or reuse the outputCopy the result, or use it as the next input to confirm that encoding and decoding preserve the original text.

Examples

Text to Base64

Input
Hello AppHelp
Output
SGVsbG8gQXBwSGVscA==

Base64 to text

Input
5L2g5aW9
Output
你好

UTF-8 decoding preserves Unicode text.

JSON value

Input
{"status":"ok"}
Output
eyJzdGF0dXMiOiJvayJ9

Common use cases

  • Encode small text snippets for JSON, YAML, environment variables, or test fixtures
  • Decode Base64 payloads from API responses, logs, and debugging notes
  • Check whether a copied Base64 string represents readable UTF-8 text
  • Create transport-safe examples for documentation without sending content to a server

Edge cases

  • Base64 is an encoding, not encryption; anyone can decode it
  • Padding with = characters is normal and may be required by strict decoders
  • Base64URL replaces + and / with URL-safe characters and may need a different decoder
  • Large files are not the target for this text tool; use a file-focused converter when needed

Features

  • Encode Unicode text to Base64
  • Decode Base64 back to readable text
  • Toggle between encode and decode modes
  • Runs entirely in the browser — no upload

Related tools

Hex Encoder and DecoderInspect text as hexadecimal UTF-8 byte values.JWT DecoderDecode JWT header and payload segments locally.JSON Formatter and ValidatorFormat decoded JSON payloads after Base64 conversion.Image Data URL ToolConvert image files into inline data URLs when file content matters.

Frequently asked questions

Is this Base64 tool free?
Yes. AppHelp's Base64 encoder is completely free with no signup, no upload, and no ads.
Does my text leave my browser?
No. All encoding and decoding runs locally in your browser using built-in JavaScript APIs.
Can it handle Unicode and emoji?
Yes. The encoder uses UTF-8 so Chinese, Japanese, Arabic, emoji, and other non-ASCII characters round-trip correctly.