Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text.
About Base64 Encode / Decode
Base64 turns any text into a safe string of letters, numbers, and a few symbols — the format used everywhere from HTTP basic auth headers and JWT segments to data URIs and email attachments. This free tool lets you encode text to Base64 online and decode Base64 back to plain text in one place, with a simple side-by-side layout: plain text on the left, Base64 on the right, and Encode and Decode buttons between them. Everything runs locally in your browser, so tokens, credentials, and private messages never leave your device.
Unlike many quick converters, this Base64 encoder and decoder is fully UTF-8 aware, so accented characters, Cyrillic, Chinese, and even emoji encode and decode correctly instead of turning into garbled text. Each pane shows a live character and byte count, which makes it easy to see the roughly 33% size overhead Base64 adds, and one-click Copy buttons put either side on your clipboard instantly. If you paste an invalid Base64 string, you get a clear error explaining which characters are allowed rather than a silent failure — useful when debugging API payloads or malformed tokens.
How to encode or decode Base64 online
- 1To encode: type or paste your text into the Plain Text pane on the left.
- 2Click Encode — the Base64 version appears instantly in the right-hand pane.
- 3To decode: paste a Base64 string into the Base64 pane on the right and click Decode to see the original text on the left.
- 4Use the Copy button above either pane to copy its contents to your clipboard.
- 5Click Clear all to reset both panes and start again.
Frequently asked questions
Does this tool handle Unicode, accents, and emoji?
Yes. Text is encoded through UTF-8 before conversion, so characters outside plain ASCII — accented letters, non-Latin scripts, and emoji — survive a round trip through Base64 without corruption. Many simpler tools break on these characters; this one does not.
Why am I getting an invalid Base64 error when decoding?
Valid Base64 contains only the characters A-Z, a-z, 0-9, +, /, and = padding. The error usually means the string was truncated, contains stray whitespace or line breaks, or uses a URL-safe variant with - and _ characters. Check that you copied the complete, unmodified string.
Can I encode files or images to Base64?
This tool is designed for text. To embed an image as a Base64 data URI you would need a file-based encoder; here you can still paste and inspect the resulting Base64 string, view its size, and decode text-based payloads.
Is Base64 encryption? Is my data secure?
Base64 is encoding, not encryption — anyone can decode it, so never rely on it to hide secrets. As for this tool, everything runs locally in your browser: nothing you type is uploaded, stored, or logged, so it is safe to work with tokens and credentials.
Is this Base64 encoder and decoder free?
Yes — completely free, with no sign-up and no limits on how much text you can convert.
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