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Base64 & URL Encoder/Decoder Online

Encode and decode Base64 strings, UTF-8 text, and URL parameters online. Fast, secure, client-side developer utility with live dual-direction translation.

Base64 & URL Encoder / Decoder

Safe encoding and decoding for tokens, credentials, and API query strings.

What is Base64 Converter?

Base64 encoding is widely used in web technologies to safely transmit binary data, authorization headers, data URIs, and webhook secrets over text-based protocols like HTTP and SMTP. TechUsar’s Base64 & URL Encoder/Decoder provides two-way conversion for plain text, JSON payloads, and URI-encoded query strings.

Key Capabilities & Features

Converts plain text and UTF-8 strings into standard Base64 representation.
Decodes Base64 encoded strings back into clean UTF-8 text.
Provides URL encode/decode mode for safely handling query parameters and URI components.
Operates 100% in your local browser sandbox.

Who Is This Tool For?

• Web developers inspecting Basic Auth tokens and JWT header segments.
• API developers debugging encoded query parameters and webhook callbacks.
• Frontend engineers creating inline Data URI strings for SVGs and CSS.

How to Use the Base64 Converter Step-by-Step

  1. 01Choose the operation mode: Encode or Decode.
  2. 02Paste your raw text or Base64 string into the input area.
  3. 03View the real-time converted output instantly.
  4. 04Click copy to transfer the result directly into your application code.

Practical Examples & Usage Scenarios

Basic HTTP Authorization Header
INPUT:
admin:supersecretpassword
OUTPUT:
YWRtaW46c3VwZXJzZWNyZXRwYXNzd29yZA==

Standard format used in Authorization: Basic HTTP headers.

Production Use Cases

JWT Payload Inspection

Decode the base64-encoded middle section of a JSON Web Token to inspect claims without sending the token to third parties.

Frequently Asked Questions

Is Base64 an encryption algorithm?

No. Base64 is an encoding format designed for data representation, not encryption. Anyone can decode a Base64 string without a secret key.

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