Free Online Base64 Encoder & Decoder Tool

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How to Use the Base64 Encoder Decoder Tool

Encode or decode Base64 strings and text instantly in your browser. Free, offline, secure. Supports plain text and binary data. No file uploads required.

  1. 1

    Select whether you want to "Encode to Base64" or "Decode from Base64" in the sidebar.

  2. 2

    Paste your string into the left input pane. The opposite pane will instantly generate the result.

  3. 3

    Click the "Copy" button in the right pane to copy your newly encoded or decoded string.

Why Choose Our Base64 Encoder Decoder?

Bi-Directional Translation

Seamlessly toggle between encoding plain text into Base64 or decoding Base64 strings back into human-readable text instantly.

Strict Local Processing

Decoding API secrets or JSON Web Tokens (JWT)? This tool uses native btoa() and atob() browser APIs, ensuring your secrets are never uploaded.

Safe Error Handling

If you attempt to decode an invalid or corrupted Base64 string, the tool safely catches the error and alerts you instead of crashing.

Developer Friendly

Perfect for debugging data URIs, decoding webhooks, inspecting cookies, or encoding credentials for basic HTTP authentication.

Frequently Asked Questions