Base64 Encoder / Decoder Online
Encode text or files to Base64, decode Base64 strings, or convert images to data URIs — entirely in your browser. No upload needed.
How to Use Base64 Encoder / Decoder
Select the tab for your task: Encode (text to Base64), Decode (Base64 to text), or File (convert any file to a data URI). Paste your input or upload your file — the result appears instantly.
Why Use This Tool
- Encode tab: paste text → get Base64 output
- Decode tab: paste Base64 string → get original text
- File tab: upload any file → get data URI with preview
- Copy the result or use for HTML/CSS embedding
What You Get
Common Use Cases
Base64-encode your API key and secret (username:password) for use in Authorization headers — the standard format for HTTP Basic Authentication.
Embed small icons and images directly in HTML or CSS as Base64 data URIs to eliminate extra HTTP requests and improve load time.
Decode the header and payload sections of JSON Web Tokens to inspect claims, expiry times, and token structure without needing a backend.
Convert images, PDFs, or binary files to Base64 strings for inclusion in JSON request bodies when uploading to APIs that don't support multipart form data.
Toolzoid Base64 vs Other Encoders
How do I encode a string to Base64 online?
Paste your text into the Encode tab on Toolzoid's Base64 tool and click Encode. The Base64 output appears instantly and can be copied with one click.
How do I decode a JWT token?
JWT tokens have three Base64URL-encoded sections separated by dots. Paste the middle section (the payload) into Toolzoid's Decode tab to see the claims.
What is a Base64 data URI?
A data URI embeds file content directly in HTML or CSS: src='data:image/png;base64,[base64string]'. Use Toolzoid's File tab to convert any image to a data URI instantly.