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Base64 Encoder and Decoder

Encodes text to Base64 and decodes Base64 back to text, with URL-safe mode and full UTF-8 support.

Developer Nothing uploaded No sign-up Free, unlimited
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In short Base64 Encoder and Decoder is a free online tool on inputtesthub.com that encodes text to Base64 and decodes Base64 back to text, with URL-safe mode and full UTF-8 support. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Base64 Encoder and Decoder

  1. Type or paste your input.
  2. The output is produced instantly as you type.
  3. Press Copy to take the result with you.

About the Base64 Encoder and Decoder

The Base64 Encoder and Decoder encodes text to Base64 and decodes Base64 back to text, with URL-safe mode and full UTF-8 support. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Decoding a token or header value while debugging.
  • Embedding a small asset in a data URI.
  • Encoding credentials for a Basic auth header.

Details

RatioBase64 output is roughly 33% larger than the input
UTF-8Handled correctly, so emoji and non-Latin scripts survive a round trip
URL-safe variantReplaces + with - and / with _, per RFC 4648 section 5
Base64 is an encoding, not encryption. Anything encoded is trivially readable by anyone. Never use it to protect a secret.

Frequently asked questions

Is there a limit on how often I can use the Base64 Encoder and Decoder?
It is free, with no account, no trial and no daily cap. Every developer tool on inputtesthub.com works the same way: open the page and use it.
Is the Base64 Encoder and Decoder safe to use with private information?
No. The Base64 Encoder and Decoder runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What does a typical result look like?
Enter Hello and the Base64 Encoder and Decoder returns SGVsbG8=.
When would I actually need the Base64 Encoder and Decoder?
The most common reasons people reach for it: decoding a token or header value while debugging. Embedding a small asset in a data URI. Encoding credentials for a Basic auth header. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
Base64 is an encoding, not encryption. Anything encoded is trivially readable by anyone. Never use it to protect a secret.
What are the reference figures here?
Ratio is Base64 output is roughly 33% larger than the input. UTF-8 is Handled correctly, so emoji and non-Latin scripts survive a round trip. URL-safe variant is Replaces + with - and / with _, per RFC 4648 section 5. These are printed on the page itself, so you do not have to take them on trust.
Can I use the Base64 Encoder and Decoder on mobile?
Yes. The page is responsive and the tool works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

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