CyberCodeBase64 Encoder / Decoder
Free online Base64 encoder and decoder. Convert text or data to Base64 and back instantly. Runs entirely in your browser — no data is sent to any server.
What is Base64 encoding?
Base64 is a method of representing binary data using only 64 printable ASCII characters (A-Z, a-z, 0-9, + and /). It exists because many systems — email, JSON, URLs, XML — can only safely carry plain text, not raw bytes.
Important: Base64 is encoding, not encryption. Anyone can decode it instantly, so it provides zero secrecy. It is used for data transport (image data URIs, JWT tokens, email attachments), never for protecting secrets. Encoding increases size by about 33%.
How to use
- 01Select Encode or Decode mode using the toggle buttons.
- 02Paste your text (or Base64 string) into the input box.
- 03Click Encode / Decode to see the result instantly.
- 04Use the Swap & reverse button to flip input and output for chained conversions.
Frequently asked questions
- What is Base64 encoding used for?
- Base64 is used to encode binary data (like images or files) into ASCII text so it can be safely transmitted in emails, URLs, JSON payloads and data URIs. It is not encryption — it is just a text-safe encoding.
- Is my data uploaded to your server?
- No. This Base64 encoder runs entirely in your browser using JavaScript. Your data never leaves your device.
- Why does my decoded text look garbled?
- Base64 can encode any binary data, not just text. If the original data was a binary file (image, PDF etc.) the decoded output will look like random characters when displayed as text.