Is this Base64 tool Unicode-safe?

Yes. It uses TextEncoder/TextDecoder to correctly handle Unicode and emoji, so characters beyond ASCII work fine.

Does any data leave my browser?

No. All encoding/decoding is performed locally in your browser. Nothing is uploaded.

Base64 Encoder & Decoder — Unicode Safe

Q: How do I make URL-safe Base64?

Replace + with - and / with _. Padding = signs may be removed depending on your use case. Example: base64.replace(/\+/g,'-').replace(/\//g,'_').replace(/=+$/,'').

Convert text ⇄ Base64

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How to use

Paste text to encode or a Base64 string to decode into the top box.
Click Encode to get Base64, or Decode to get text.
Shortcut: press Enter to Encode, Shift+Enter to Decode.
Use Copy output to copy the result.

Tips

Unicode/emoji-safe: uses TextEncoder/TextDecoder, so non-ASCII works correctly.
URL-safe variant: replace + → - and / → _; padding = may be trimmed.
Decoder accepts whitespace, URL-safe characters, and auto-adds missing padding.
For Data URLs, strip the prefix like data:...;base64, before decoding.
Works offline once loaded; no data leaves your browser.

FAQ

Is this Unicode-safe?

Yes. We encode bytes via TextEncoder and decode via TextDecoder, so emoji and non-ASCII scripts round-trip correctly.

How do I make URL-safe Base64?

Replace + with - and / with _. You may remove trailing =. This tool’s decoder accepts URL-safe input automatically.

Why do I get “InvalidCharacterError” when decoding?

Usually due to stray characters or bad padding. Remove whitespace and ensure the length is a multiple of 4 (add = as needed). This tool normalizes most of that for you.

Can I decode Data URLs?

Yes—remove the data:*;base64, prefix first, then paste only the Base64 part.

Does any of my data leave my browser?

No. All encoding/decoding happens locally.

Does it work offline?

Yes. After the first load, the page works without internet.

Related tools

More text & encoding utilities:

Text → PDF JSON Formatter URL Tools

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