Encode text to Base64 or decode Base64 back to plain text.
About this tool
Base64 is a binary-to-text encoding scheme commonly used to encode data in URLs, emails, and APIs. This tool supports full UTF-8 text encoding and decoding entirely in your browser.
Runs in your browser — nothing is uploaded; your input never leaves your device. How it works
Quick answer
Paste text to encode it to Base64, or paste a Base64 string to decode it back to plain text — instantly, in your browser, with full UTF-8 support.
Why use Tabreon for this?
Encoding and decoding both happen entirely in your browser — nothing you paste is sent to a server.
Full UTF-8 support, so non-ASCII text (accented characters, emoji, non-Latin scripts) round-trips correctly.
No account, no daily limit, no character cap.
How to encode or decode Base64
1Paste your input. Enter the text you want to encode, or the Base64 string you want to decode.
2Choose Encode or Decode. Click the matching button to run the conversion.
3Copy or download the result. Copy the output directly, or download it as a file.
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It's commonly used to embed binary data in text-based formats such as JSON, XML, email (MIME), and URLs, where raw binary bytes aren't safe to transmit directly.
How Tabreon handles your data
Encoding and decoding both run in your browser using its built-in Base64 and UTF-8 conversion functions — nothing you paste is transmitted anywhere.
Key features
Encode and decode in the same input box
Full UTF-8 text support, not just ASCII
Downloadable output for larger payloads
Clear error message if the input isn't valid Base64
Common use cases
Encoding an API key or credential for inclusion in a config file
Decoding a Base64-encoded payload from an API response or JWT segment
Embedding small binary data as a data URI
Common mistakes & limitations
This tool encodes and decodes text you paste in — it doesn't currently accept file uploads for binary encoding.
Decoding invalid Base64 (wrong padding, characters outside the Base64 alphabet) returns an error rather than a best-effort guess.
Frequently asked questions
No. Encoding and decoding both happen locally in your browser — nothing you paste is transmitted to a server.
The input isn't valid Base64 — check for missing padding (`=` characters) or characters outside the standard Base64 alphabet.
Yes, the encoder and decoder both handle full UTF-8 text, not just ASCII.