Advanced Base64 Encoder/Decoder

The Advanced Base64 Encoder/Decoder is a powerful, developer-grade tool designed to convert text and files to and from Base64 with precision, security, and deep inspection features. Unlike basic Base64 utilities, this tool supports full binary-safe encoding, automatic file type detection, Base64URL conversion, padding control, line wrapping, escape modes (JSON, URL, HTML), and instant error diagnostics. It can handle plain text, images, PDFs, audio files, and binary data with high accuracy, providing detailed output views including decoded text, hexadecimal representation, raw binary bytes, and live file previews for supported formats. Developers can upload or drag-and-drop files, generate Data URLs, decode Base64 back to original files, examine byte sizes before and after encoding, and even generate QR codes directly from encoded content. The tool also includes smart features such as auto-detecting Base64 on paste, URL-safe toggling, and full UTF-8 support for emojis and multilingual text. Built for web developers, cybersecurity analysts, data engineers, and power users, this advanced utility is ideal for debugging encoding issues, inspecting binary structures, embedding images in HTML/CSS, handling JWT/Base64URL data, and safely processing encoded payloads in APIs or web apps—all with complete client-side processing to ensure data privacy.

Primary Use Cases

• •Encode text, files, and binary data into Base64 for embedding images, fonts, and assets directly into HTML, CSS, JSON, or API payloads.
• •Decode Base64 strings back into readable text or original files while inspecting their underlying binary and hex structure for debugging or reverse-engineering.
• •Analyze uploaded files by detecting MIME types, previewing images, PDFs, and audio, and converting them to Data URLs for web development or frontend prototyping.
• •Convert between standard Base64 and Base64URL formats for JWT tokens, OAuth flows, Firebase keys, and other web security or authentication workflows.
• •Debug corrupted or malformed Base64 data using the tool’s error diagnostics, missing padding detection, whitespace cleanup, and escape/unescape modes.

How to Use

1. 1.Choose whether you want to Encode or Decode using the mode selector at the top of the tool.
2. 2.Enter your text manually into the input box, paste Base64 to auto-detect decode mode, or upload/drag-and-drop a file to process it automatically.
3. 3.Adjust advanced options such as URL-safe mode, padding, line wrapping, or escape formats (JSON, URL, HTML) based on your output requirements.
4. 4.Use the output view tabs to inspect the result as decoded text, hexadecimal bytes, raw binary, or view a live preview if the decoded data is an image, PDF, or audio file.
5. 5.Copy the result, download the output, convert to Base64URL, generate a Data URL, or decode the Base64 directly back into the original file using the available action buttons.