Base64 is everywhere in development: image data URLs in HTML, binary attachments in email, blobs inside JSON payloads. A Base64 encoder/decoder converts between raw text and its Base64 form in real time.
What Base64 is (and is not)
Base64 maps binary data onto 64 printable ASCII characters so it survives text-only channels. It is not encryption and offers no security — a Base64 string decodes in one step. Use it for transport and embedding, never for protecting secrets.
Real-world uses
- Image data URLs — embed a small image directly in HTML or CSS.
- Email attachments — SMTP is text-only, so binaries are Base64-encoded in transit.
- JSON payloads — binary or Unicode content is stored as a Base64 string field.
- Auth tokens — formats like Basic auth carry credentials as Base64.
How to encode or decode
Choose Encode to turn readable text into Base64, or Decode to reverse it. Paste your input and the output updates as you type — Unicode and UTF-8 text are handled correctly. Because the conversion runs locally, sensitive strings never leave your browser.
Spot the difference: encoding vs encryption
Encoding is reversible without a key (that is the point). Encryption needs a key and is designed to be difficult to reverse without it. If you see a tool claim Base64 "encrypts" your data, treat it as a red flag — Base64 is for format, not secrecy.