About Free Base64 Encoder
The Free Base64 Encoder & Decoder converts text and files to and from Base64 format instantly in your browser. Base64 encoding is essential for embedding binary data in text-based formats like JSON, XML, HTML, and email.
Encode any text string to Base64 or decode existing Base64 strings back to their original content. The tool also supports file encoding - convert images, PDFs, and other files to Base64 data URIs that can be embedded directly in HTML or CSS.
Processing happens entirely in your browser, ensuring your sensitive data (like API credentials or encoded documents) never leaves your device. This makes our tool safe for encoding passwords, tokens, and confidential files.
How to Use This Tool
- 1Choose 'Encode' or 'Decode' mode using the toggle
- 2For text: paste or type your content in the input area
- 3For files: drag and drop or click to upload a file
- 4The encoded/decoded result appears instantly
- 5Click copy to copy the result or download as a file
Common Use Cases
Embedding Images in HTML/CSS
Convert images to Base64 data URIs for inline embedding without separate HTTP requests.
API Authentication Headers
Encode credentials for Basic Auth headers used in REST API calls.
Email Attachments
Encode file attachments for MIME email formats and email APIs.
JSON Data Embedding
Embed binary data in JSON payloads that only support text.
Configuration Files
Encode certificates, keys, and binary configs for YAML and environment files.
Debug Encoded Data
Decode Base64 strings in logs, cookies, or API responses for debugging.
Features
Two-Way Conversion
Both encode to Base64 and decode from Base64 in one tool.
Text & File Support
Encode plain text or upload files including images, PDFs, and documents.
Data URI Generation
Automatically generates data URIs for images ready to paste in HTML or CSS.
Instant Processing
Results appear in real-time as you type or immediately after file upload.
Large File Support
Handle files up to several megabytes efficiently.
Download Results
Download decoded files or save encoded text output.
Frequently Asked Questions
Free Base64 Encoder & Decoder
Encode and decode Base64 for text and files instantly in your browser. Our free Base64 encoder converts text strings, images, PDFs, and other binary files to Base64 format — and back again. Essential for developers working with APIs, email attachments, data URIs, and embedded content.
All encoding and decoding happens locally — your data never leaves your device. Support for standard Base64 and URL-safe Base64 variants. Handle large files with streaming encoding for optimal performance.
Base64 for Developers & Data Processing
Embed images directly in HTML/CSS with data URIs, encode API payloads, or decode Base64 strings from webhooks and email headers. Our tool shows real-time output as you type with syntax highlighting.
Verify the integrity of your Base64 data with a hash checksum. Format decoded JSON payloads with the JSON Formatter. Resize images before encoding with the Image Resizer. Explore all free developer tools from GME Labs.