Convierte cualquier archivo a Base64 al instante. Sube imágenes, PDFs, documentos, audio o cualquier tipo de archivo. Procesamiento local, gratuito, sin registro.
This free online tool converts any file into a Base64-encoded string or Data URI format. Base64 encoding transforms binary file data into ASCII text, making it easy to embed files directly into HTML, CSS, JavaScript, JSON, XML, email templates, and API payloads without requiring external file references. Unlike image-specific converters, this tool handles any file type — PDFs, Word documents, Excel spreadsheets, audio files, video files, ZIP archives, and more. All conversion happens entirely in your browser using the FileReader API — no files are ever uploaded to a server, guaranteeing complete privacy and security. Simply drag and drop or click to browse, and get your Base64 output in seconds.
Base64 is a binary-to-text encoding scheme that converts binary file data into a string of ASCII characters. Converting files to Base64 allows you to embed them directly into text-based formats like HTML, CSS, JSON, XML, and emails. This is essential when you need to transmit binary data through systems that only handle text, such as JSON APIs, email protocols, and URL parameters. However, Base64 strings are approximately 33% larger than the original binary file.
Yes, absolutely. All file processing happens entirely within your browser using the native FileReader API. Your file never leaves your device, is never uploaded to any server, and is never stored in any database. You can verify this by checking your browser's network tab — no outbound requests are made when you upload or convert a file. This makes the tool completely safe even for sensitive or confidential documents.
This converter supports literally any file type because it reads the raw binary data and encodes it. Common use cases include PDFs, Word documents (DOC/DOCX), Excel spreadsheets (XLS/XLSX), images (PNG, JPG, GIF, WebP), audio files (MP3, WAV), video files (MP4), ZIP archives, JSON files, text files, and more. There are no file type restrictions — if it's a file, it can be Base64 encoded.
Standard Base64 uses characters A-Z, a-z, 0-9, +, /, and = padding. URL-safe Base64 replaces + with - and / with _ and removes = padding, making it safe for use in URLs and filenames without escaping. Data URI format wraps the Base64 string with a MIME type prefix (e.g., data:application/pdf;base64,) making it ready to use directly in HTML src attributes and CSS. Choose based on your use case.
The tool supports files up to 50MB. For larger files, your browser's memory may become a constraint because the resulting Base64 string is approximately 33% larger than the original file. A 50MB file will produce a Base64 string of roughly 67MB. For very large files, consider splitting them or using a dedicated file transfer service.
Base64 encoding increases data size by approximately 33% because it uses 4 ASCII characters to represent every 3 bytes of binary data. This is normal and expected. For example, a 1MB file will produce a Base64 string of approximately 1.33MB. For this reason, Base64 is best suited for smaller files (under a few megabytes) or situations where text-based transmission is required.
For HTML embedding, use the Data URI format: <embed src="data:application/pdf;base64,...">. For API payloads, use Standard Base64 in your JSON field. For URL parameters, use URL-safe Base64 to avoid encoding issues. For CSS, use Data URI in background-image or similar properties. The tool provides all three formats — just select the one that matches your use case.
Yes. Once the page is loaded, all conversion happens locally in your browser. No internet connection is required to use the tool. This makes it ideal for use in air-gapped environments, on airplanes, or anywhere with limited connectivity. You can even save the page for offline use in most modern browsers.