Base64 Decoder
Decode Base64 (standard or URL-safe) back to readable UTF-8 text, with clear errors for invalid input.
Base64 Encoder
Encode text or a file to Base64 in your browser, with UTF-8 support and an optional URL-safe alphabet.
How to use
- Type or paste text, or choose a file to encode as a data URI.
- Tick URL-safe if the result goes into a URL or filename.
- Copy the Base64 output.
What this tool does
Text is converted to UTF-8 bytes before encoding, so emoji and non-Latin scripts work correctly. Files are read locally and never uploaded.
Why it matters
Base64 lets binary data travel through systems that only handle text, such as JSON, email or data URIs. It is an encoding, not encryption: anyone can decode it.
Frequently asked questions
Is Base64 secure?
No. It only changes the representation. Never use it to hide passwords or secrets.
Why is the output bigger?
Base64 uses four characters for every three bytes, so encoded data is about 33% larger.
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Related guides
Developer Guides
Base64 Encoding Explained (and When Not to Use It)
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