Developer Tools
Base64 Encoder / Decoder
Encode or decode Base64 — text and files.
What this tool does
Base64 is everywhere — JWT tokens, email attachments, data URIs, basic auth headers. This tool encodes any text or file to Base64 and decodes it back.
Why it matters
Base64 Encoder / Decoder saves you time and removes guesswork from everyday developer tools work. Text and file mode — and because everything runs in your browser, your data stays private and results are instant.
- Text and file mode
- URL-safe variant
- Browser-only
How to use
- Paste text or drop a file.
- Click Encode or Decode.
- Copy or download the result.
Example output
Input: hello world Output: aGVsbG8gd29ybGQ=
Real-world use cases
- • Embedding images in CSS as data URIs
- • Inspecting JWT tokens
- • Encoding binary files for transport
Tips & best practices
- • Use URL-safe Base64 for query strings
- • Don't use Base64 for encryption — it's encoding, not security
- • Decoding a JWT reveals the header and payload, not the signature
Frequently asked questions
What's the size penalty?
Base64 increases data size by ~33%.
Is Base64 secure?
No, it's just encoding. Anyone can decode it.
What's the URL-safe variant?
It replaces + and / with - and _.
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