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Free Online Base64 Converter

Convert text to Base64 or decode Base64 back to readable UTF-8. Supports URL-safe Base64 (- and _), optional padding, line wrapping, and whitespace-tolerant decoding. Everything runs locally in your browser.

Category: Developer · URL: /tools/free-online-base64-converter.html
Input
Tip: For Base64 image/Data URL workflows, use Online Base64 Converter Image.
Output
Related tools
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Pick an action (Encode or Decode), set options, then convert.

  1. Paste text or Base64 into the input box.
  2. Choose Encode or Decode.
  3. (Optional) Enable URL-safe, toggle Padding, set Line wrap, or enable Ignore whitespace for decoding.
  4. Click Convert, then Copy output if needed.
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Secondary intents covered: Encode a UTF-8 string into Base64 for APIs or headers, Decode a Base64 payload back into readable text, Convert to URL-safe Base64 for JWTs and URL parameters, Remove or restore Base64 padding (=) when needed, Wrap Base64 output with fixed line lengths for PEM/email formats, Clean and decode Base64 that contains whitespace/newlines, Quickly verify if a string looks like valid Base64/Base64URL, Copy converted output to clipboard

FAQ

What is Base64 used for?

Base64 encodes bytes into printable ASCII, commonly used for JSON payloads, tokens, email attachments, and embedding small data in text-only channels.

Is Base64 encryption?

No. Base64 is reversible encoding, not encryption; anyone can decode it.

How does this tool handle Unicode (UTF-8) text?

Encoding uses UTF-8 bytes before Base64 conversion, so characters like emojis and symbols round-trip correctly in modern browsers.

What is URL-safe Base64 (Base64URL)?

It replaces + with - and / with _, and often omits = padding, making it safer in URLs and JWTs.

Do I need padding (=) at the end?

Some systems require padding and others don’t; if decoding fails elsewhere, try enabling padding or restoring it automatically.

Can I decode Base64 that contains spaces or newlines?

Yes. Enable “Ignore whitespace (decode)” to strip spaces and line breaks before decoding.

Can this decode a Data URL like data:image/png;base64,... ?

This tool expects raw Base64; for Data URLs and images use the image Base64 tool.

Is my data uploaded anywhere?

No. Conversion runs locally in your browser and the tool does not make network requests.