What it is
Utilverse's Base64 Converter is the most complete tool to encode and decode anything to and from Base64 online. Turn text, binary files and images into Base64 strings — and back — with live two-way conversion, image previews, full Data URI generation, URL-safe variants, MIME line wrapping, multiple charsets and ready-to-paste HTML/CSS/Markdown snippets. Everything runs in your browser: your content never leaves your device.
- Encode and decode text, files and images with instant live bidirectional conversion
- Pro options: URL-safe, padding, 64/76-char line wrapping, UTF-8/ASCII/ISO-8859-1 charsets
- Data URI output with proper MIME, ready-made snippets for HTML <img>, CSS background and Markdown
How it works
Pick a mode
Choose Text, File or Image. In text mode the app auto-detects whether you want to encode or decode.
Paste or drop
Paste your text, drop a file in the drop zone or pick an image. The conversion starts instantly.
Copy or download
Copy the result to your clipboard, download it as a file, or grab the ready-made HTML/CSS/Markdown snippets.
Features
Live Encode & Decode
Instant bidirectional conversion with auto-detect: paste Base64 to get the text, paste text to get Base64.
Files & Images
Drag & drop any file up to 25 MB, preview decoded images, output as Data URI with automatic MIME detection.
Professional Options
URL-safe (RFC 4648 §5), optional padding, MIME 64/76 line wrapping, UTF-8, ASCII and ISO-8859-1 charsets.
Privacy First
Everything happens in your browser. No uploads, no sign-up, no tracking of content: your data stays on your device.
FAQ
No. Encoding and decoding run entirely in your browser via JavaScript: your data never leaves your device.
URL-safe Base64 replaces "+" and "/" with "-" and "_", so the output is safe to use in URLs, JWTs and file names.
Yes: enable the "Include Data URI prefix" option or use Image mode — the output will be in the form data:image/png;base64,... ready for <img>, CSS or Markdown.