<div class="nfaf-generated-content"><div class="nfaf-visual-card" style="--nfaf-accent:#62aa94"><div class="nfaf-visual-icon" aria-hidden="true"><svg viewBox="0 0 64 64" role="img"><circle cx="32" cy="32" r="28" fill="currentColor" opacity=".12"></circle><path d="M20 34l8 8 17-19" fill="none" stroke="currentColor" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"></path></svg></div><div><strong>Base64 Encoder and Decoder</strong><span>Browser-first utility with visible inputs, outputs, and limitations.</span></div></div><p class="nfaf-lede">This tool converts text to the Base64 representation used in many transport and test contexts, and it reverses Base64 text back into Unicode text when the input is valid.</p><p><strong>Designed for:</strong> Developers and technical teams exchanging small text values in documentation, APIs, or test fixtures.</p><h2>How to use this tool</h2><p>Enter text and choose Encode to create a Base64 string. Choose Decode to interpret a valid Base64 string as UTF-8 text. The result panel reports invalid input instead of silently returning partial data.</p><h2>How the result is produced</h2><p>The interface uses the browser atob and btoa primitives with UTF-8 conversion around them. Base64 is an encoding, not encryption, so anyone who receives the encoded text can decode it.</p><h2>Test examples</h2><p>Encode “Hello” to SGVsbG8=. Decode SGVsbG8= back to “Hello”. A string containing characters outside the Latin-1 range is converted through UTF-8 so common Unicode text can be handled.</p><h2>Limitations</h2><p>Base64 does not provide confidentiality, authentication, or password protection. This text tool is not a binary-file encoder and should not be used as a security boundary. Invalid padding or characters will produce a decode error.</p><h2>Privacy and processing</h2><p>Encoding and decoding occur in the browser. The input is not sent to the Nofyi server by this tool.</p><h2>Related guide</h2><p><a href="https://nofyi.com/base64-encoding-not-encryption/">Base64 is encoding, not encryption: practical uses and limits</a></p><h2>Related tools in this category</h2><ul class="nfaf-related-tools"><li><a href="https://nofyi.com/tools/json-formatter/">JSON Formatter and Validator</a><span>Paste a JSON object or array, then format it or validate its syntax.</span></li></ul><h2>Documentation</h2><ul><li><a href="https://www.rfc-editor.org/rfc/rfc4648" rel="nofollow noopener" target="_blank">https://www.rfc-editor.org/rfc/rfc4648</a></li><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa" rel="nofollow noopener" target="_blank">https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa</a></li><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/atob" rel="nofollow noopener" target="_blank">https://developer.mozilla.org/en-US/docs/Web/API/Window/atob</a></li></ul><p class="nfaf-disclosure">This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.</p></div><div class="nfaf-app-slot">[nfaf_tool_app]</div>
