Text to Base64 Encoder & Decoder
Base64 encoding is essential whenever you need to embed binary or text data inside formats that only support ASCII, such as JSON payloads, email attachments, or HTML data URIs. Our free Text to Base64 tool lets you encode plain text into Base64 or decode Base64 strings back to readable text, all in real time with full UTF-8 support. The encoder uses the browser-native TextEncoder and TextDecoder APIs, so accented characters, CJK text, and even emoji are handled correctly. Switch between encode and decode modes with a single click, and see character counts for both input and output. For other encoding needs, explore the Slug Generator for URL-safe strings or the Find and Replace tool for batch text transformations. Everything runs locally in your browser with zero data transmitted to external servers, keeping your content private and secure. Developers, system administrators, and anyone working with APIs will find this tool a daily time-saver.
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Base64 output appears hereHow to Use This Tool
- Select Encode or Decode mode using the toggle buttons at the top.
- Type or paste your text (for encoding) or Base64 string (for decoding) into the input area.
- The result appears instantly in the output area below as you type.
- Click Copy to copy the output to your clipboard, or Clear to reset.
Examples
| Mode | Input | Output |
|---|---|---|
| Encode | Hello, World! | SGVsbG8sIFdvcmxkIQ== |
| Encode | { "key": "value" } | eyAia2V5IjogInZhbHVlIiB9 |
| Decode | WWFudHJhc2FnYXJhbQ== | Yantrasagaram |
What This Tool Is Useful For
- Encoding API keys, tokens, or configuration strings for inclusion in JSON or YAML files.
- Creating data URIs for embedding small images or fonts directly in HTML and CSS.
- Decoding Base64 strings found in API responses, JWT tokens, or email headers.
- Preparing text payloads for systems that require Base64-encoded input, such as AWS Lambda or GitHub Actions.
- Debugging encoded data in logs, network requests, or database entries.
Frequently Asked Questions
- What is Base64 encoding?
- Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is commonly used to embed binary data like images or files inside text-based formats such as JSON, XML, email (MIME), and HTML data URIs. Base64 increases the size of the data by roughly 33%.
- Does this tool handle Unicode and emojis?
- Yes. The encoder uses the TextEncoder API to convert your text to UTF-8 bytes before Base64-encoding, and the decoder uses TextDecoder to properly reconstruct UTF-8 text. This means accented characters, Chinese, Japanese, Korean, Arabic, and emoji are all handled correctly.
- Is Base64 encryption?
- No. Base64 is an encoding scheme, not an encryption method. Anyone can decode Base64 data without a key. It is designed for data transport, not security. If you need to protect sensitive data, use proper encryption algorithms like AES or RSA before Base64-encoding the result.
- Why does Base64 output end with = or ==?
- Base64 encodes data in groups of three bytes (24 bits) into four characters. If the input length is not a multiple of three, padding characters (=) are added to the end to fill the final group. One byte remaining means two padding characters (==), and two bytes remaining means one padding character (=).
- What is the maximum input size?
- There is no hard limit imposed by this tool. Since all processing happens in your browser, the practical limit depends on your device memory and browser capabilities. Most modern browsers can handle several megabytes of text without issues. For very large files, consider using a command-line tool like the base64 command.
More Text Tools
- All Text Tools — browse the full collection of text utilities
- Slug Generator — create URL-friendly slugs instantly
- Find and Replace — search and replace text with regex support
- Case Converter — transform text to uppercase, title case, and more
- Yantrasagaram homepage
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