How do I encode base64 online?

Paste your text into the tool above, set Mode to Encode, and run it — you get the Base64 string instantly. It is free, needs no signup, and runs entirely in your browser.

How do I decode base64?

Paste the Base64 string into the Text box, set Mode to Decode, and run the tool. If the input is not valid Base64 you get a clear error instead of garbled output.

How do I convert text to base64?

Type or paste the text, choose Encode mode, and run the tool. The result uses the standard Base64 alphabet, so it works anywhere Base64 is expected — data URIs, auth headers, config files.

What is a base64 converter used for?

Base64 converts binary or Unicode text into plain ASCII so it can travel safely through text-only channels: embedding images in data URIs, HTTP Basic auth credentials, email attachments (MIME), and API payloads.

Does this base64 decoder handle emoji and non-English text?

Yes — the underlying js-base64 engine is Unicode-safe, unlike the browser's native btoa/atob which throw on non-Latin1 characters. Emoji, Arabic, Urdu, CJK and other scripts round-trip correctly.

Is my text uploaded anywhere when I use this base64 encoder?

No. Encoding and decoding happen locally in your browser via the vendored js-base64 library — nothing is sent to a server, stored, or logged.

Base64 Encoder & Decoder Online

What is Base64 encoder & decoder?

Base64 Encoder & Decoder — Encode text to Base64 or decode Base64 back to readable text with this free tool. Unicode-safe and fully client-side — nothing is ever uploaded.

Encoding and decoding are performed by js-base64 (vendored open-source library, BSD-3-Clause), which handles full Unicode correctly — native btoa/atob throw on non-Latin1 characters, js-base64 does not. Decode mode first validates the input with the library's own validity check, so malformed Base64 is rejected with a clear error instead of decoding to garbage. Whitespace and line breaks in pasted Base64 are tolerated. Everything runs in your browser; no text is sent to any server.

Why use this base64 encoder & decoder?

🎯

Built for base64 encoder & decoder

Encode text to Base64 or decode Base64 back to readable text with this free tool. Unicode-safe and fully client-side — nothing is ever uploaded.

📋

Transparent & honest

Standard Base64 alphabet (A–Z, a–z, 0–9, +, /, = padding) — not the URL-safe variant that uses - and _ instead of + and /.

🔒

Private by design

Everything runs in your browser. Your inputs never leave your device.

📱

Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

🔄

Regularly updated

Regularly maintained and reviewed to ensure accuracy.

💡

Free forever

No accounts, no limits, no watermarks. Use Base64 Encoder & Decoder as much as you need.

How to use Base64 Encoder & Decoder

1Paste or type your content into the "Text" box.
2Pick "Encode" in the "Mode" dropdown to turn text into Base64, or "Decode" to turn Base64 back into readable text.
3Run the tool to get the result instantly.
4Copy the result — encoding is Unicode-safe, so emoji and non-Latin scripts survive the round trip.
5When decoding, make sure the input is valid Base64 — the tool flags anything it cannot decode instead of producing garbled text.

What can you do with Base64 Encoder & Decoder?

Encode base64 online — Encode text to Base64 or decode Base64 back to readable text with this free tool.
Decode base64 — Encode text to Base64 or decode Base64 back to readable text with this free tool.
Convert text to base64 — Encode text to Base64 or decode Base64 back to readable text with this free tool.
What is base64 converter used for — Encode text to Base64 or decode Base64 back to readable text with this free tool.

Good to know

Standard Base64 alphabet (A–Z, a–z, 0–9, +, /, = padding) — not the URL-safe variant that uses - and _ instead of + and /.
Decode mode validates first: input that fails the library's validity check is rejected with an error rather than decoded to garbage.
Whitespace and line breaks inside pasted Base64 are tolerated; surrounding whitespace is trimmed before decoding.

How it works

Encoding and decoding are performed by js-base64 (vendored open-source library, BSD-3-Clause), which handles full Unicode correctly — native btoa/atob throw on non-Latin1 characters, js-base64 does not. Decode mode first validates the input with the library's own validity check, so malformed Base64 is rejected with a clear error instead of decoding to garbage. Whitespace and line breaks in pasted Base64 are tolerated. Everything runs in your browser; no text is sent to any server.

Examples

Encode a greeting

Status: ok — result "SGVsbG8sIHdvcmxkIQ==".

Decode back to text

Status: ok — result "Hello, world!".

Unicode round trip

Status: ok — result "aGVsbG8gaHVzbmFpbiDinJM="; the ✓ survives because encoding is Unicode-safe.

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