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Base64 Encoder & Decoder
Convert text to Base64 and back, with full Unicode support.
Quick Tool Overview
The Base64 Encoder & Decoder converts text to Base64 and back, with full Unicode support and a URL-safe mode. Base64 lets binary data travel through systems that only expect text — email bodies, JSON fields, data URIs and HTTP headers.
- What it does
- Encodes text to Base64 and decodes Base64 back to text
- You give it
- Plain text or a Base64 string
- You get back
- The converted string, standard or URL-safe
- Best for
- API payloads, data URIs, JWT parts and HTTP headers
About the Base64 Encoder & Decoder
Base64 encodes binary data using 64 printable ASCII characters so it can travel safely through systems that only expect text — email bodies, JSON fields, data URIs and HTTP headers. It is an encoding, not encryption: anyone can decode it, so never treat it as a way to hide a secret.
This converter handles Unicode correctly. Naive Base64 tools break on emoji and accented characters because they assume one byte per character; here the text is UTF-8 encoded first, so any script round-trips exactly. There is also a URL-safe mode that swaps the plus and slash characters for hyphen and underscore, which is what JWTs and query parameters require.
Key features of the Base64 Encoder & Decoder
Correct Unicode handling
Text is UTF-8 encoded first, so emoji and accented characters round-trip exactly instead of breaking the way naive one-byte-per-character tools break them.
URL-safe mode
Swaps plus and slash for hyphen and underscore, which is what JWTs and query parameters require.
Encode and decode in one place
Flip the direction without switching pages or re-pasting your input.
Honest about what Base64 is
It is an encoding, not encryption — anyone can decode it, so it is never a way to hide a secret.
Runs locally
Tokens and payloads are converted in your browser and never sent to a server.
How to use the Base64 Encoder & Decoder
-
1
Choose a direction
Switch between Encode and Decode depending on which way you are converting.
-
2
Paste your input
Enter plain text to encode, or a Base64 string to decode.
-
3
Copy the output
The result updates as you type. Copy it with one click.
Frequently asked questions
No. Base64 is a reversible encoding with no key. Anyone who has the string can decode it, so it offers no confidentiality whatsoever.
Base64 works in three-byte groups. When the input length is not a multiple of three, one or two equals signs are appended as padding.
A variant that replaces the plus and slash characters with hyphen and underscore, because the standard characters have special meaning inside a URL. JWT tokens use this variant.
Usually the string was truncated, contains stray whitespace or line breaks, or is URL-safe Base64 being decoded in standard mode. Switch the mode and try again.
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