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How to Encode and Decode Base64 Step by Step (2026 Guide)

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Researched with the help of AI tools, edited and reviewed for accuracy by (Founder, WikiPlus).

Base64 encoding appears everywhere in web development — API authentication headers, email attachments, embedded images in CSS and HTML, JWT tokens, and binary data transmission. Yet many developers reach for an online tool without fully understanding what Base64 does or when to use it correctly. WikiPlus Base64 Tool at wikiplus.co encodes and decodes Base64 instantly, running entirely in your browser with no data uploaded to a server. Paste a string or upload a file, and get the Base64-encoded output in seconds — no account, no installation. This step-by-step guide shows you exactly how to use it for the most common Base64 encoding and decoding tasks.

Step 1: Encode Text to Base64

Step 2: Decode Base64 to Text

Step 3: Encode Files to Base64

Step 4: Understand When to Use URL-Safe Base64

Frequently Asked Questions

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