Base64 Encode Decode Online — Free Tool
Base64 encoding is used everywhere in web development — JWT tokens, data URIs, email attachments, API authentication headers. Toolzoid's Base64 encoder/decoder handles text, files, and images in your browser with zero data sent to any server. Three modes: encode text, decode Base64 string, convert file to data URI.
Encode or Decode Base64 Instantly
Free · No sign-up
Encode and decode Base64 online free — no upload, instant results. Convert text, files, and images to Base64 data URIs. Browser-based with zero data storage.
Open Base64 Encoder / Decoder →Free · Instant · No account required · Works in your browser
Frequently Asked Questions
How do I encode text to Base64 online?
Go to Toolzoid's Base64 tool, select the 'Encode' tab, paste your text, and click Encode. The Base64 output appears instantly and can be copied with one click.
How do I decode a Base64 string?
Select the 'Decode' tab, paste your Base64 string, and click Decode. If the string is invalid Base64, an error message will explain the problem.
How do I convert an image to a data URI?
Use the 'File → Data URI' tab, click the file input to upload an image. The data URI is generated instantly with a live preview of the image.
When should I use Base64 encoding?
Use Base64 for: embedding small images in CSS/HTML, encoding API credentials for HTTP Basic Auth headers, working with binary data in JSON, and transmitting data through text-only protocols.