Base64 Decoder
Paste Base64 and decode it back to text, a downloadable file or a previewed image. Handles standard and URL-safe alphabets, data URIs, missing padding and whitespace. Everything runs locally in your browser — nothing is uploaded.
Base64 input
0 chars
Decoded output
Waiting for input…
0 bytes
What this Base64 decoder handles
Standard & URL-safe
Decodes the normal +/ alphabet or the URL-safe -_ variant (RFC 4648).
Data URIs
Automatically strips a data:…;base64, prefix so you can paste it straight in.
Loose input
Ignores spaces and line breaks and repairs missing = padding.
Text or binary
Shows UTF-8 text, or download the raw bytes as a file when it isn't text.
Image preview
Detects PNG, JPEG, GIF, WebP, BMP and SVG and previews the image inline.
Private
Decoding happens in your browser — your data is never uploaded.