File Kit
Free Base64 Converter — Encode & Decode Files
Convert files to Base64 strings or decode Base64 back to files. Auto-detect MIME types, preview images. Free online tool.
FAQ
What is Base64 encoding?
Base64 encodes binary data as ASCII text. It's used to embed files in HTML/CSS, send binary data in JSON/XML, and transmit files over text-only protocols.
Can I encode any file type?
Yes, any file type can be encoded — images, PDFs, documents, audio, video, and more.
Does Base64 increase file size?
Yes, Base64 encoding increases size by about 33%. It's best for small files and data URIs.
How is the MIME type detected?
If you paste a data URI, the MIME type is extracted from the prefix. Otherwise, the file is treated as binary.