Encode text or images to Base64 strings, or decode Base64 data back to their original files. Everything runs client-side in your browser's RAM, keeping your passwords, tokens, and graphics fully secure.
Drag and drop an image or file, or paste your input below to convert instantly.
A Data URL embeds file contents directly into code using the format data:[mediatype];base64,[data]. You can paste this string directly into HTML image tags (<img src="...">) or CSS background properties to load graphics without making extra HTTP requests.
Yes. Many standard web decoders crash or corrupt text when handling non-ASCII letters, emojis, or international alphabets. FileSwift handles UTF-8 characters properly so your text is preserved with 100% fidelity.
Because the conversion happens entirely within your browser's memory without network uploads, the size ceiling is determined by your system's RAM. We recommend keeping file transfers under 20MB to ensure smooth performance inside the browser.