Base64 Encoder
Encode text and files to Base64 format instantly
Input
Output
What is Base64 Encoding?
Need to encode data to Base64? This tool converts text, files, and binary data into Base64 format instantly. Base64 (RFC 4648) is a standard encoding scheme that represents binary data as ASCII text, making it safe to transmit over channels that only support text.
According to MDN Web Docs, Base64 encoding is essential for embedding binary data in JSON, XML, HTML, and URLs. Our encoder follows the RFC 4648 Base64 specification for standard and URL-safe encoding.
Everything happens in your browser using native JavaScript btoa() — your data never leaves your computer.
What Makes This Tool Different
Text & File Encoding
Encode plain text directly or upload any file format. Works with images, documents, executables — any binary data converts to Base64.
Real-Time Encoding
See Base64 output instantly as you type. No buttons to click — just paste text and get your encoded result immediately.
File Upload Support
Upload any file type up to several megabytes. Images, PDFs, executables — all encode to Base64 for embedding or transmission.
Copy & Download
One-click copy to clipboard or download as .txt file. Perfect for embedding in code, emails, or configuration files.
Privacy First
All encoding happens locally in your browser using JavaScript. Sensitive files and data never touch our servers.
Syntax Highlighting
Both panels feature syntax highlighting for easy reading. Input and output are color-coded for instant recognition.
How It Works
Enter Text or Upload File
Type or paste your text into the left editor, or click "Upload" to select a file. The tool accepts any text content or binary files.
Automatic Encoding
As soon as you paste, the encoder processes your data and displays the Base64 result on the right. No buttons needed for text.
Copy or Download
Click "Copy" to copy the Base64 to your clipboard, or "Download" to save it as a file. Use it in your project immediately.
When You'd Actually Use This
Embed Images in HTML/CSS
Convert small images to Data URIs for embedding directly in HTML, CSS, or JSON. Reduces HTTP requests.
API Development
Send binary data through JSON APIs that only accept text. Encode images, PDFs, or files for transmission via REST endpoints.
Email Attachments
MIME email uses Base64 for attachments. Encode files for email transmission or decode received email attachments.
Configuration Files
Embed certificates, keys, or binary data in YAML, TOML, or JSON configs. Kubernetes secrets often use Base64.
Common Questions
Is my data stored?
No. All encoding happens in your browser using JavaScript btoa(). Your data never leaves your computer.
What's the difference between standard and URL-safe Base64?
Standard Base64 uses + and / characters. URL-safe replaces these with - and _ to avoid issues in URLs.
Is there a size limit for files?
The limit depends on your browser's memory. Small files (under 5MB) encode instantly. Very large files may cause performance issues.
Can I decode Base64 too?
Yes! Use our Base64 Decoder to convert Base64 back to text or binary files.
Why does my output have = at the end?
Those are padding characters per RFC 4648. Base64 uses them to ensure the encoded length is a multiple of 4.
Is Base64 encryption?
No. Base64 is encoding, not encryption. It transforms data to text format but provides no security. Anyone can decode Base64.
Other Base64 Tools You Might Need
Encoding is just one part of Base64 workflow. Here are related tools: