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Base64 Encoder/Decoder

Encode text or files to Base64 and decode Base64 strings back to plain text. Handles Unicode with TextEncoder and supports file upload encoding.

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data using only 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is widely used to safely transmit binary data (like images or files) over text-only channels like email (MIME), URLs, or JSON APIs. The name "Base64" comes from the fact that it encodes 3 bytes of input into 4 characters of output, using an alphabet of 64 characters.

Common use cases include embedding images directly in HTML/CSS as data URIs, encoding JWT tokens, passing binary data in HTTP headers, and storing binary objects in JSON. Our encoder handles full Unicode text using the TextEncoder API for accurate multi-byte character support.

How to Use the Base64 Encoder/Decoder

  1. Select Encode mode to convert plain text to Base64, or Decode to convert Base64 back to text.
  2. Paste your text into the input area. Results are generated live.
  3. Use the File to Base64 tab to encode an entire file (image, PDF, etc.) to a Base64 string.
  4. Click Copy to copy the result to your clipboard.

FAQ

Does Base64 encrypt my data?

No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string without a key. Do not use it to secure sensitive data — use proper encryption (AES, RSA) for that purpose.

Why does Base64 output end with = or ==?

Base64 works in groups of 3 bytes. When the input length is not divisible by 3, padding characters (=) are added at the end to complete the final group. One = means 1 byte of padding was added; == means 2 bytes.