Base64 Encode/Decode
Base64 is a way of representing binary data — like images, files, or arbitrary bytes — as plain ASCII text, so it can safely travel through systems that only handle text, such as URLs, JSON payloads, or email. This tool encodes text or files to Base64, decodes Base64 back to its original form, and can automatically detect which direction you need. Everything runs locally in your browser; nothing you enter is uploaded anywhere.
Frequently asked questions
Is Base64 encoding the same as encryption?
No. Base64 is a reversible encoding scheme, not encryption — anyone can decode it instantly with no key or password. Use it for safely representing data as text, not for keeping data secret.
What does the URL-safe toggle do?
Standard Base64 uses '+' and '/' characters, which have special meaning in URLs. Enabling URL-safe Base64 replaces them with '-' and '_' and removes padding, so the result can be used directly in a URL or filename.
Can I encode or decode files, not just text?
Yes — drag and drop a file (or click to browse) and it will be encoded to Base64. Binary files are supported, not just text files.
How does auto-detect decide whether to encode or decode?
In Auto mode, the tool checks whether your input only contains valid Base64 characters and successfully decodes. If it does, it assumes you want to decode; otherwise it encodes your input as text. You can always override this with the Encode or Decode tabs.