Base64 Encoder
Encode text to Base64 without sending it anywhere.
Runs entirely in your browser.
Your data never leaves this device and is never sent to our servers.
Base64
Base64 represents binary data using 64 printable characters, so it survives transports that only accept text — HTTP headers, JSON payloads, data URIs, email bodies. It is an encoding, not encryption: anyone can decode it, so never use it to protect a secret.
How to use it
- Type or paste the text you want to encode.
- Tick “URL-safe” if the result will be used in a URL or filename.
- Copy the encoded output.
Not working as you expect? Report a problem with this tool.
Frequently asked questions
Is Base64 encryption?
No. It is a reversible encoding with no key. Anyone who has the string can decode it in seconds. Use it for transport, never for confidentiality.
What does URL-safe mean?
The standard alphabet includes + and /, which have meaning inside a URL. The URL-safe variant substitutes - and _ and drops the trailing = padding.
Why is the output longer than the input?
Base64 encodes three bytes as four characters, so output is about 33% larger than the input.