Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 back to text, with full Unicode support.
How to use this tool
- Select your file, drag it onto the box above.
- Processing starts automatically — there is nothing to configure.
- Check the result panel, which shows the original size, the final size and the page count.
- Click Download to save it.
Base64 encodes binary data using 64 safe characters so it survives systems that expect text. It is not encryption — anyone can decode it instantly, so it protects nothing.
The specification
| Direction | Encode or decode |
|---|---|
| Character set | A–Z, a–z, 0–9, + / with = padding |
| Unicode | Handled correctly via UTF-8 |
| Size overhead | Roughly 33% larger when encoded |
How it works
This tool runs entirely in your browser. There is no server involved, which means nothing you type or upload is transmitted, stored, or logged — and there are no usage limits, because there is nothing for us to ration.
You can confirm it yourself: open your browser's developer tools, select the Network tab, and use the tool. No request is made.
Who uses this
Embedding small images in CSS or HTML, inspecting a JWT payload, decoding an API token, or moving binary data through a text-only channel.
Frequently asked questions
Is Base64 encryption?
No, and this matters. It is an encoding, fully reversible by anyone with no key. Never use it to protect a password or any sensitive value.
Why does my encoded text look longer?
Base64 represents three bytes as four characters, so output is about 33% larger than the input. That is the cost of being text-safe.
Does it handle emoji and accents?
Yes. Text is converted to UTF-8 bytes before encoding, so all Unicode round-trips correctly — unlike naive implementations that break on non-ASCII.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device. Your file is never transmitted and never stored by us. You can confirm this by opening your browser’s Network tab while you use the tool — you will see no upload request.
Is there a limit on how many files I can process?
No. There is no daily cap, no account, and no watermark. Because the work happens on your device rather than our servers, there is nothing for us to ration.
Is this tool really free?
Yes — no account, no trial, no watermark, and no cap on usage. It runs on your own device rather than our servers, so there is no cost for us to pass on.
Does it work on mobile?
Yes. The interface adapts to phone and tablet screens, and everything runs in the browser, so there is no app to install.
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Your files stay on your device. This tool runs entirely in your browser. No file is uploaded, transmitted, or stored. You can verify this by opening your browser's Network tab while using the tool.
Disclaimer. Specifications published by exam boards, governments and platforms change without notice. We verify and date every specification on this site, but you should always confirm against the official source before submitting an application. See our full disclaimer.