Base64 Encoder & Decoder
Encodes text to Base64, or decodes Base64 back to the original text. Common for query parameters, Authorization headers and temporarily hiding plain text.
Simply encode and decode strings into their base64 representation.
Steps and notes
What is Base64 Encoder & Decoder — Padding, URL-Safe, Binary-Safe?
Base64 is an encoding that represents data using 64 printable ASCII characters, so payloads can travel through text-only channels: email (MIME), data URLs, HTTP Basic credentials and JSON fields. It maps every 3 bytes to 4 characters and pads the tail with = when the input is not a multiple of 3 bytes.
- Enter the text on the left
- The encoded result appears on the right immediately
- To decode, flip the direction and paste the Base64 into the left side
- Base64 is encoding, not encryption — anyone can reverse it, so never use it to store passwords
Frequently asked questions
- Is Base64 encryption?
- No. It is a reversible encoding with no secret key — anyone can decode it. Never use it to protect passwords or tokens; use real encryption or hashing for that.
- Why does the result end with one or two = signs?
- Base64 processes input in 3-byte groups. When the last group is incomplete, = characters pad the output to a multiple of 4. The padding carries no data and can stay as it is.
- Why does my Base64 break inside a URL?
- The standard alphabet uses + and /, which have special meanings in URLs. Switch on the URL-safe option when decoding such values, and percent-encode the string before putting it into a query parameter.
Category: Converter
JWT tools workflow
JWT Decoder & Parser — Inspect Header, Payload and Expiration → Base64 Encoder & Decoder — Padding, URL-Safe, Binary-Safe → Date Converter — Formats, Time Zones and ISO 8601 → Unix Timestamp Converter — Epoch to Date, Seconds vs Milliseconds