Base64 encodes binary or text data into a safe set of ASCII characters so it can travel through systems that only handle text — like JSON, URLs, email, and data URIs. Here is how to encode and decode it.
What Base64 Is For
- Embedding small images directly in CSS or HTML as data URIs
- Sending binary data inside JSON payloads
- Encoding credentials for Basic Auth headers
- Safely transmitting data through text-only channels
Note: Base64 is encoding, not encryption — it is easily reversible and provides no security on its own.
How to Use Base64 on ToolHub
Step 1: Open the Base64 tool.
Step 2: Paste your input. Enter text to encode, or a Base64 string to decode.
Step 3: Choose direction. Click Encode or Decode.
Step 4: Copy the result. One click copies the output.
Common Pitfalls
- URL-safe Base64 replaces + and / with - and _; pick the right variant for URLs.
- Decoding fails if the string is truncated or has invalid characters — check for copy/paste errors.
- Encoded data is about 33% larger than the original, so avoid it for very large files.
Related Tasks
To make text safe inside a query string instead, use the URL Encoder. To validate the JSON that contains your Base64 data, use the JSON Formatter.
Frequently Asked Questions
Is Base64 secure? No — it is reversible encoding, not encryption.
Does it work for unicode/emoji? Yes, text is handled as UTF-8.
Is my data private? Yes. Everything runs in your browser.