Base64 Encode & Decode Online
Base64 Converter is a free base64 encode decode online tool — type or paste into either box and the other updates instantly. It handles full Unicode (emoji, accents, non-Latin scripts) correctly, and nothing you type ever leaves your browser. No upload, no account, no ads.
Type or paste into either box above — Text or Base64 — and the other updates instantly. Everything happens right here in your browser.
Ready to convert? Just start typing.
Use the free Base64 Converter →What this tool does
Base64 Converter is a bidirectional base64 encoder/decoder — most online tools make you pick a direction and press a button. Here, the Text box and the Base64 box stay in sync live: edit either one and the other recalculates as you type, so you can use it as a base64 online decoder and a base64 online encoder from the exact same screen. It's a base64 converter online that stays a base64 converter free of ads, accounts, and upload limits.
How to encode text to Base64
Open capsuletools.app/base64-converter/ and type or paste your text into the left Text box. The Base64 box on the right fills in immediately — no convert button, no wait. Tap Copy above the Base64 box to grab the result.
Under the hood, this is a standard text to base64 online conversion: your
string is encoded as UTF-8 bytes, then run through the browser's own btoa()
routine — the same algorithm every Base64 library uses. Use it as a free
text to base64 converter any time you need to encode a string on the fly.
How to decode Base64 to text
Paste your Base64 string into the right-hand box. The tool decodes it and shows the plain text on the left immediately — a live base64 to text online conversion with no button to press. It works as a full base64 to text converter online, not just a one-off decode.
If the string you pasted isn't valid Base64 (bad characters, broken padding), a small notice appears under the box and the Text field simply keeps its last good decode — it never freezes, crashes, or loses your place. That makes it safe to decode base64 string online even when you're not sure the input is well-formed.
Unicode & special character support
A plain btoa() call breaks the moment your text contains anything outside
Latin-1 — emoji, curly quotes, Japanese, Arabic, Cyrillic, and more all fail. Base64
Converter encodes text as UTF-8 first, so those characters round-trip correctly in both
directions. Paste a string with emoji or accented letters and decode it right back to see
for yourself.
Frequently asked questions
What is Base64 encoding used for?
Base64 turns arbitrary bytes into plain ASCII text, so it's used anywhere binary data needs to travel safely through a text-only channel — embedding images in CSS/HTML as data URLs, sending attachments in email (MIME), storing credentials or tokens in config files and JWTs, and passing values through APIs or URLs that don't handle raw binary well.
How do I convert text to Base64 online?
Open Base64 Converter and type or paste your text into the left Text box — the Base64 box
on the right updates instantly as you type. No button to press, no upload: the encoding
happens in your browser using the same TextEncoder and btoa() APIs the
browser itself provides.
How do I decode a Base64 string back to text?
Paste the Base64 string into the right-hand box. The tool decodes it immediately and shows the plain text on the left. If the string isn't valid Base64, a small notice appears under the box and the Text field simply keeps showing the last successful decode — it never freezes or throws an error.
Does this Base64 converter support Unicode and special characters?
Yes. Text is encoded as UTF-8 before Base64 conversion, so emoji, accented letters, and
non-Latin scripts (Japanese, Arabic, Cyrillic, and more) round-trip correctly in both
directions — unlike a plain btoa() call, which breaks on any character
outside Latin-1.
Is this Base64 encoder/decoder free and does it upload my data?
As a base64 encoder decoder online, it's completely free, with no account and no sign-up. Nothing you type or paste ever leaves your device — encoding and decoding both run locally in your browser tab, so it's safe to use for sensitive strings like tokens or credentials.
Use the free Base64 Converter →
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