Encode plain text to Base64 or decode Base64 back to readable text.
Base64 Encoder/Decoder uses text or Base64 input and encode or decode mode to encode plain text as Base64 or decode a Base64 value back to text. In the browser, Base64 Encoder/Decoder uses text or Base64 input and encode or decode mode to encode plain text as Base64 or decode a Base64 value back to text. Base64 Encoder/Decoder then places the encoded or decoded text in the result panel.
For Base64 Encoder/Decoder, encode mode converts the JavaScript string to UTF-8 bytes through encodeURIComponent before btoa. For Base64 Encoder/Decoder, decode mode reverses that path, so decoded bytes must form valid UTF-8 text.
Base64 Encoder/Decoder example input: Mode = encode; input = A Base64 Encoder/Decoder expected result: Encoding the sample A produces QQ==. To verify Base64 Encoder/Decoder, reproduce its worked example and compare the displayed or downloaded encoded or decoded text with the stated expected result. When Base64 Encoder/Decoder returns a file, open the download and inspect every affected page or image.
Base64 Encoder/Decoder rejects empty input. For Base64 Encoder/Decoder, decode mode displays “Invalid Base64 string” when atob or UTF-8 decoding throws.
For Base64 Encoder/Decoder, base64 is an encoding, not encryption, hashing, access control, or secret storage.
Base64 Encoder/Decoder runs the base64 tool operation in the current browser session. Base64 Encoder/Decoder reads and processes the supplied values in the current browser and does not submit them to an application endpoint. Browser extensions, device security and any manual sharing or download from Base64 Encoder/Decoder remain outside the tool’s control.
For Base64 Encoder/Decoder, no explicit text-length, file-size or numeric-range cap is enforced by this operation code. With Base64 Encoder/Decoder, empty input can produce an empty result or a validation message; With Base64 Encoder/Decoder, characters, formats or browser features outside those handled by the operation may change or prevent the result.
After using Base64 Encoder/Decoder, you may also find these tools useful: json-formatter, jwt-decoder, random-token-generator.
Continue the workflow
Base64 Encoder/Decoder is part of the Developer Tools section. Use the nearby pages below when the same job needs checking, cleanup, conversion, formatting, or a different output before you finish.
