Choose operation and profile
Alphabet and padding never change silently.
Choose · validate · convert
Base64 text without silent repair or variant guessing.
Base64Lens converts UTF-8 text with explicit standard or URL-safe alphabets, explicit padding and visible byte evidence. Input stays in the browser.
No account, upload, files, JWT parsing, charset guessing, saved data or public result link.
Three explicit steps
Choose the contract, convert the complete text, review bytes
Validate the complete source
One invalid character clears stale output.
Copy canonical text
Byte evidence defines the delivered artifact.
Small local encoding jobs
Useful for API examples, configuration and text handoffs
- Encode multilingual sample text as exact UTF-8 bytes.
- Decode a documented Base64 text field without uploading it.
- Compare standard and URL-safe alphabet output.
- Expose padding or canonical-bit errors before reuse.
Explicit profile · local text
Run the exact conversion in Base64Lens
Choose encode or decode, standard Base64 or base64url, and padded or unpadded form. The complete text is validated in this browser without upload, automatic repair or hidden variant detection.