Free Base64 Encoder & Decoder Online - Convert Text & Files
Encode and decode Base64 strings instantly. Convert text, images, and files to Base64 format. Free, fast, and secure Base64 conversion tool.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format. It uses 64 different ASCII characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it completely safe for transmission over text-based protocols like email, JSON, or XML.
Why Use Base64?
- ✓Safe TransmissionPrevents data corruption during transfer.
- ✓Universal StandardSupported by all programming languages.
- ✓Data EmbeddingEmbed images directly in HTML/CSS.
- ✓API FriendlyEasily send binary files via JSON APIs.
How to Use
Convert strings or files in three simple steps
Select Mode
Choose Encode or Decode mode, and select whether you are inputting Text or a File.
Enter Data
Paste your text, Base64 string, or upload your document/image file.
Convert & Copy
Click the convert button and instantly copy your processed data to the clipboard.
Common Use Cases
HTML Images
Encode tiny images directly into HTML/CSS using data URIs to reduce HTTP requests.
API Transfers
Send binary data like PDFs or Images safely through JSON REST APIs.
Email Attachments
Encode files for MIME email transmission behind the scenes.
Data Storage
Store binary objects securely in text-only databases or local storage.
Base64 Best Practices
Not for Security
Never use Base64 to hide passwords or sensitive data. It is easily reversible.
Mind the Size
Base64 increases file size by ~33%. Avoid encoding very large files for web.
URL Safe Format
Use URL-safe Base64 (+ and / replaced with - and _) when passing via URLs.
Proper Prefix
When embedding images, ensure you include the correct Data URI prefix.
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Frequently Asked Questions
Everything you need to know about Base64 encoding and our free tool.