Base64 Decoder Online – Free Base64 String Decoder Tool
Decode base64 strings instantly with our free online base64 decoder tool. Convert base64 to image (PNG, JPEG, GIF, WebP), PDF documents, text files, and binary data. Automatic format detection with preview support.
Base64 Input
Paste your base64 string here
Decoded Output
Decoded content will appear here
Base64 Decoder Features
Auto Format Detection
Automatically detects images (PNG, JPEG, GIF, WebP, SVG), PDF files, text content, JWT tokens, and binary data from base64 strings without manual configuration.
Image Preview
Preview decoded images directly in your browser. Full support for PNG, JPEG, GIF, WebP, and SVG formats with instant visual preview.
PDF Support
Decodes and previews PDF files from base64 strings with proper MIME type detection and full PDF viewer support with page navigation.
JWT Token Decoding
Automatically detects and decodes JWT tokens, displaying header, payload, and signature in a structured, readable format.
Text Decoding
Decode text content from base64 strings with automatic UTF-8 encoding detection ensuring accurate text extraction.
Data URI Support
Automatically handles data URI format (data:mime/type;base64,...) strings, extracting and decoding the base64 portion seamlessly.
Download & Copy
Download decoded files in original format or copy text content to clipboard with one click.
Privacy First
All decoding happens in your browser. Your data never leaves your device or gets sent to any server.
How to Use Base64 Decoder
Paste Base64 String
Copy and paste your base64 encoded string into the input textarea on the left. Supports both plain base64 strings and data URI format (data:mime/type;base64,...).
Decode Automatically
The tool automatically decodes your input as you type (debounced). Click "Decode" button to manually trigger decoding or "Validate" to check if the string is valid base64.
View Decoded Output
See the decoded content in the output area on the right. The tool automatically detects the format (image, PDF, text, JWT, or binary) using advanced detection algorithms.
Preview Content
View image previews, PDF documents with page navigation controls, JWT token structure with header/payload breakdown, or text content instantly.
Copy to Clipboard
Click the copy button to copy text content to your clipboard. For images and binary files, use the download button instead.
Download Files
Download decoded files in their original format. The download button is enabled once valid base64 data is successfully decoded and a file format is detected.
Understanding Base64 Decoding
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to embed binary data (like images, PDFs, or files) directly into text-based formats such as HTML, CSS, JSON, or XML. Our base64 decoder tool helps you decode these base64 strings back to their original format instantly.
Why Use Base64 Decoder?
Decoding Base64 is essential for extracting the original binary data from its text representation. Common use cases include extracting embedded files, debugging during development, data recovery, security analysis, and content verification.
Supported Formats
Our decoder supports images (PNG, JPEG, GIF, WebP, SVG), PDF documents, plain text (UTF-8), JWT tokens, binary data, and data URI format strings. All formats are automatically detected using advanced algorithms.
Security & Privacy
All decoding happens directly in your browser. Your Base64 strings and decoded data never leave your device. We do not store, transmit, or have any access to your data, ensuring complete confidentiality for sensitive information.
Common Use Cases for Our Free Online Base64 Decoder
Web Development & Debugging with Base64 Decoder
Use our base64 decoder online free to decode Base64 encoded images, fonts, or other assets embedded directly in HTML, CSS, or JavaScript. Our base64 decoder for developersis essential for debugging web applications and inspecting network payloads. The decode base64 string to imagefeature helps verify embedded content quickly.
API & Data Integration with Base64 Decoder Tool
Process Base64 encoded data received from APIs or other systems using our online base64 decoder tool. Convert it back to its original format for further processing, storage, or display. Our base64 decoder online freehandles various formats including images, PDFs, and text, making it perfect for API integration workflows.
Email & Document Processing with Base64 to PDF Converter
Extract and decode Base64 attachments from email bodies or embedded content within documents using ourbase64 decoder online free. Our base64 to pdf converter online is particularly useful for forensic analysis or content recovery. The decode base64 to text online feature helps extract text content from encoded email attachments.
Security & Forensics Analysis with Base64 Decoder
Analyze Base64 encoded strings found in logs, network captures, or malware samples using ourbase64 decoder online free. Our base64 decoder tool helps decode them to reveal hidden commands, data, or malicious payloads. The secure, browser-based processing ensures your sensitive security data never leaves your device.