Base64 Encoder/Decoder
Encode and decode text or files to/from Base64
Base64 Encoder/Decoder converts text to and from Base64. Decoding checks that your input actually looks like valid Base64 (correct character set, correct padding) before attempting to decode it, rather than silently returning garbage for non-Base64 input.
How to use Base64 Encoder/Decoder
- 1
Paste your text or Base64 string.
- 2
Choose Encode (text to Base64) or Decode (Base64 to text).
- 3
The converted result appears instantly.
- 4
Copy the result.
Everything you need to know about Base64 encoding
What is Base64, and why does it exist?
Base64 converts binary or text data into a plain ASCII string using only letters, numbers, and a couple of symbols — a format that survives being passed through systems (like older email protocols, or JSON) that expect plain text and might otherwise corrupt raw binary data.
A common misunderstanding
Base64 is encoding, not encryption — anyone can decode it instantly with no key or password required. Don't use it to protect sensitive information; use it purely for safe transport through text-only systems.
When you actually need this
- Embedding binary data in JSON or a URL, which can't safely carry raw binary.
- Decoding a Base64 string you've received to see what it actually contains.
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Frequently Asked Questions
What happens if I try to decode something that isn't valid Base64?
It's flagged as invalid rather than decoded into meaningless bytes — the input is checked against the Base64 character set and padding rules first, so a plain sentence won't silently turn into garbage output.
Is Base64 encryption?
No — Base64 is just a reversible encoding, not encryption. Anyone can decode it back to the original text instantly; it provides no security or confidentiality.
What's a common use for Base64 encoding?
Representing binary or arbitrary data as plain ASCII text — for example, embedding small images directly in CSS or HTML, or safely transmitting data through systems that only handle text.
Does this tool send my text to a server?
Yes — it's sent to our servers to encode or decode and the result is returned to you; nothing is stored.
Is this tool free to use?
Yes — completely free, with no signup and no usage limits for casual use.