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Base64 Encoder Decoder
Encode UTF-8 text to Base64, decode Base64 back to text, convert URL-safe Base64, control padding, validate input, and inspect byte counts directly in your browser.
Validation
Base64 result details
Input characters11
Input UTF-8 bytes11
Output characters16
Padding characters1
Detected alphabetStandard
ValidationValid
Base64 notes
Text encodingThis tool encodes and decodes Unicode text using UTF-8 bytes before Base64 conversion.
PaddingStandard Base64 often ends with = or == so the encoded length is a multiple of 4.
URL-safe Base64URL-safe mode uses - and _ instead of + and /, which is common in tokens and URLs.
Not encryptionBase64 is reversible encoding, not hashing or encryption.
Base64 character reference
| Variant | Characters | Notes |
|---|---|---|
| Standard | A-Z a-z 0-9 + / | Common MIME and general Base64 alphabet |
| URL-safe | A-Z a-z 0-9 - _ | Safer in URLs, filenames, and tokens |
| Padding | = | Fills output length to a multiple of 4 |
| Line wrap | 76 characters | Common for MIME-style encoded text |
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FAQ
Is Base64 encryption?
No. Base64 is reversible encoding. Anyone can decode it, so it should not be used to hide secrets.
Why does Base64 output end with equals signs?
Equals signs are padding. They make the encoded output length a multiple of 4 characters.
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _. It often omits padding, especially in tokens.