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Base64/URL/Hex Encoder Decoder

Base64/URL/Hex encoder and decoder. Zero-knowledge tool—runs locally in your browser.

Base64 has no key: anyone can reverse it, so it encodes rather than protects. Use standard Base64 for file payloads and Base64URL when the result must survive a URL or a JSON Web Token segment.

Tool workspace

Select Encoding Mode

Base64 alphabetURL-safe output omits = padding. Decoding accepts both alphabets either way.
How to Encode Text, Files, or Hex Strings Online

Use this zero-knowledge tool to encode/decode Base64, URL, convert between Hex and UTF-8, handle HTML entities, or process Unicode escape sequences.

  1. 1

    Select encoding mode

    Choose Text, File, Hex, or HTML/Unicode conversion.

  2. 2

    Enter or upload data

    Type text, select a file, or paste hex/HTML/Unicode string.

  3. 3

    Click action button

    Encode, decode, convert, or download with one click.

  4. 4

    Copy or download result

    Use the copy button to export the result or download as a file.

When to Use This Tool
  • 1Encode binary data for embedding in JSON, XML, or HTML
  • 2Decode URL parameters in web development and debugging
  • 3Convert hex dumps from network traffic or memory dumps
  • 4Encode special characters for safe transmission in email or chat

Frequently Asked Questions

Which encoding formats are supported?

Base64, URL encoding, Hex, and HTML entities, including Unicode escapes.

Is encoding the same as encryption?

No. Encoding is reversible without a key and is not secure. Never use it to protect sensitive data — use the AES encryptor instead.

Does it work offline?

Yes. All conversions happen in your browser, so the tools keep working after the page has loaded.

Which Base64 variants does the decoder accept?

Both the standard alphabet (+, /) and the URL-safe alphabet (-, _) are accepted, and padding may be omitted (common in JWTs and URL parameters). Malformed padding such as Z=m9v, AB=C or Zm9vYmFy= is rejected with an explicit error, and inputs containing spaces or line breaks are rejected as well rather than being silently repaired. Hex input is separate: it must contain only 0-9/a-f and have an even number of characters.

How do I decode a data URI?

Paste the full data: URI and the tool separates the media type from the Base64 payload before decoding. The decoded bytes are shown locally, so binary content can be inspected without uploading it.

Related Guides

Related Tools

Base64 vs Base64URLData URI
Network-verified: see this tool's measured requests
Your inputs remain on your device.

You are responsible for key management and output validation.