Free Encoding & Decoding Tools — Base64, URL, HTML Entity
Encoding and decoding data is fundamental to web development. Whether you're embedding images in CSS, escaping HTML for safe rendering, or encoding URLs for API calls, these tools make the process instant.
All tools work client-side — your data stays in your browser. No uploads, no tracking, just fast encoding and decoding.
Feature Comparison Matrix
| Tool | Encoding Type | Bidirectional | Binary Support | Use Case | Try It |
|---|---|---|---|---|---|
|
B64
Base64 Encode/Decode
Encode & decode Base64 strings
|
Base64 (RFC 4648) | Yes (encode/decode) | Text only | API payloads, email, data URIs | Open → |
|
%20
URL Encode/Decode
Encode & decode URLs
|
Percent-encoding (RFC 3986) | Yes (encode/decode) | ✗ No | URLs, query parameters | Open → |
|
&;
HTML Entity Encoder
Encode & decode HTML entities
|
HTML entities | Yes (encode/decode) | ✗ No | XSS prevention, safe HTML | Open → |
|
🖼
Image to Base64 Converter
Convert images to Base64 strings
|
Base64 data URI | Encode only | Yes (images) | Embed images in HTML/CSS | Open → |
Explore Tools in This Category
Base64 Encode/Decode
Encode and decode Base64 strings online. Supports text and UTF-8. Free browser-based tool.
URL Encode/Decode
Encode and decode URLs and query parameters online. Handles special characters and Unicode.
HTML Entity Encoder
Encode and decode HTML entities online. Convert special characters to HTML-safe strings.
Image to Base64 Converter
Convert images to Base64 data URIs online. Supports PNG, JPG, GIF, SVG. Free image encoder.
Which Tool Should You Use?
Pick the right tool based on your specific use case:
Base64 converts binary to ASCII text safe for JSON transport.
Percent-encodes spaces, ampersands, and Unicode for valid URLs.
Converts <, >, & and quotes to HTML entities to prevent XSS.
Embed images directly in CSS or HTML as data URIs.
Common Use Cases
- ✓ Encode binary data to Base64 for API payloads
- ✓ Decode Base64 strings from JWT tokens or emails
- ✓ URL-encode query parameters for safe HTTP requests
- ✓ Convert HTML special characters to entities for XSS prevention
- ✓ Embed images as Base64 data URIs in HTML or CSS
Related Categories
See Also
Frequently Asked Questions
What is Base64 encoding used for?
Base64 converts binary data into ASCII text, making it safe to transmit via text-based protocols like email (MIME), JSON APIs, and HTML data URIs.
Is URL encoding the same as percent-encoding?
Yes. URL encoding (also called percent-encoding) replaces unsafe characters with a '%' followed by their hex value. For example, a space becomes '%20'.
When should I use HTML entity encoding?
Use HTML entity encoding whenever you display user-generated content in HTML to prevent XSS attacks. Characters like <, >, &, and " must be escaped.
Try These Tools Now
All tools are free, run in your browser, and require no signup.