Tools
Encode UTF-8 text as standard Base64 or decode valid standard Base64 back to UTF-8 text locally in the browser.
Encoding is not encryption. Calculations run locally in your browser.
Base64 is a reversible representation of bytes using a 64-character alphabet. RFC 4648 defines standard Base64 characters A–Z, a–z, 0–9, plus and slash, with equals signs for padding. This tool first encodes ordinary text as UTF-8 bytes, then Base64-encodes those bytes. In reverse, it decodes standard Base64 bytes and interprets them as UTF-8 text.
For “Hello”, UTF-8 bytes produce SGVsbG8=. Unicode works too: the text “你好” becomes 5L2g5aW9. If the decoded bytes are not valid UTF-8, the tool reports an error rather than showing corrupted replacement characters. It also rejects malformed Base64 padding and unsupported URL-safe alphabet variants. The input size is capped so a pasted large file cannot freeze the page.
Base64 is not encryption and provides no secrecy, integrity or authentication. Anyone with the encoded string can decode it. Do not publish passwords, tokens or personal data simply because they appear encoded. This tool handles text only, not arbitrary binary files, data URLs or image previews. Calculations run locally in the browser; a page’s ordinary network resources and the site’s hosting behavior are separate from the converter logic.
Example: Hello → SGVsbG8=; decoding SGVsbG8= returns Hello.
Use the sample inputs above to reproduce this result. The numeric display is rounded for reading; measurements and real-world conditions can carry more uncertainty than the arithmetic.
No. It is a reversible encoding, not encryption.
Yes. Text is encoded to UTF-8 bytes before Base64 conversion.
The decoded bytes may be binary rather than valid UTF-8 text.
It marks the final Base64 group when the byte count is not a multiple of three.
Last reviewed: October 31, 2026. Verify measurements, source conditions and local requirements for decisions that matter.
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Encode UTF-8 text as standard Base64 or decode valid standard Base64 back to UTF-8 text locally in the browser.
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