About Base64 Encoder/Decoder

About This Tool

Base64 Encoder/Decoder is a free online tool that encodes and decodes 11 base encoding formats: Base64, Base64URL, Base64 MIME, Base64 PEM, Base32, Base32 Hex, Hex (Base16), Base58, Base62, Base85, and Base91. It auto-detects the format of encoded strings, previews decoded images, and generates ready-to-use code snippets. All processing happens entirely in your browser.

Key Features

• Encode and decode 11 base encoding formats in one tool
• Auto-detect format from pasted encoded strings
• Smart result preview — JSON highlighting, image preview, hex dump
• Code snippets for HTML, CSS, Node.js, Python, JavaScript, PowerShell
• File drag-and-drop support up to 10MB
• Encoding efficiency comparison across 9 formats
• Client-side processing — your data never leaves your browser

Who Is This For?

This tool is designed for developers debugging API responses with Base64 data, DevOps engineers inspecting PEM certificates and SSH keys, frontend developers creating Data URIs for inline images, security engineers analyzing JWT tokens, and anyone working with encoded data in their daily workflow.

Privacy

Your data is processed locally in your browser using JavaScript. Nothing is sent to any server. This tool is safe to use with production tokens, API keys, certificates, and sensitive data.