64 Sadevz Base64 Encoder & Decoder Open Tool
100% client-side, nothing leaves your browser

Free Base64 Encoder & Decoder

Encode text or files into Base64, decode Base64 back into readable text or downloadable files. Everything happens locally in your browser for complete privacy.

Start Encoding

No uploads • No tracking • No registration

Input mode

Live Statistics

Input Characters0
Output Characters0
Input Bytes0
Output Bytes0
Expansion0%
Processing Time0 ms

How It Works

1

Enter text or upload a file

Type or paste text, or drop any file into the file panel.

2

Encode or decode instantly

Click Encode or Decode and the conversion runs immediately in your browser.

3

Copy or download the result

Copy the output to your clipboard or download it as a text or binary file.

Common Uses

API authentication Encode credentials for Basic Auth headers and API tokens.
Email attachments MIME email encodes binary attachments as Base64 text.
Embedding images in HTML/CSS Inline small images as data URLs to cut extra HTTP requests.
JSON APIs Carry binary payloads safely inside text-only JSON fields.
Data URLs Build self-contained data: URIs for fonts, icons and images.
Binary transfer Move binary data through text-only channels without corruption.
Debugging Inspect and decode Base64 payloads found in logs or requests.
Learning Base64 See exactly how encoding and decoding transform your data.

Frequently Asked Questions

What is Base64?+

Base64 is a way of representing binary data using only 64 printable ASCII characters (A-Z, a-z, 0-9, + and /). It's commonly used to safely embed binary data inside text-based formats like JSON, XML, HTML and email.

Why is Base64 larger than the original data?+

Base64 groups every 3 bytes of input into 4 output characters, which increases the size by roughly 33%. The tradeoff is that the result is plain text, which is safe to transmit through systems that only handle text.

Is Base64 a form of encryption?+

No. Base64 is an encoding scheme, not encryption. It provides no confidentiality — anyone can decode it instantly. Never use Base64 alone to protect sensitive data.

Can Base64 contain Unicode text?+

Yes. This tool converts your text to UTF-8 bytes before encoding, so Arabic, Urdu, Chinese, Japanese, emoji and accented characters all round-trip correctly.

Can I encode images with this tool?+

Yes. Switch to File mode, upload an image, and it will be converted to a Base64 string you can paste into a CSS data URL or an HTML img tag.

Can I decode files back to their original format?+

Yes. Paste a Base64 string in File mode and decode it — you'll be prompted for a filename and the original file will be reconstructed for download.

Does this tool upload my files anywhere?+

No. Everything runs locally in your browser using JavaScript. Nothing is uploaded, transmitted or stored on any server.

Is Base64 encoding reversible?+

Yes. Base64 is fully reversible — decoding a valid Base64 string always reconstructs the exact original bytes.

Can I use Base64 in URLs?+

Standard Base64 uses characters like + and / that have special meaning in URLs. Enable URL-safe mode to swap them for - and _ so the result can be used safely in URLs and filenames.

What is URL-safe Base64?+

URL-safe Base64 replaces + with - and / with _, avoiding characters that would need to be percent-encoded in a URL. This tool supports encoding and decoding both variants.

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