Base64Lens
Open converter

Explicit RFC 4648 profiles

Encode or decode UTF-8 text without guessing the Base64 variant

Choose standard Base64 or base64url, choose padding, and get strict canonical validation entirely in this browser.

Runs locally

Convert one UTF-8 text value

Text stays in this browser

Up to 500,000 UTF-16 units for plain text or 1,000,000 Base64 characters.

Text only: no files, JWT parsing, MIME, data URI prefixes, whitespace repair or alphabet auto-detection.

Base64 is not encryption. Do not paste live credentials or secrets merely because processing is local.

Exact result

Canonical Base64 output

UTF-8 bytes18
Base64 symbols24
Padding characters0
Input UTF-16 length13
Output UTF-16 length24
Explicit profileStandard Base64 (+ /) · Padded (= required when needed)
Converted text
First 32 bytes in hexadecimal
48 65 6C 6C 6F 2C 20 D0 BC D0 B8 D1 80 20 F0 9F 8C 8D

No trimming, whitespace removal, normalization, charset guessing, padding repair or alphabet auto-detection is applied.