Encode plain text to Base64 or decode it back.
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Base64 Encoder / Decoder converts plain text into Base64 and turns Base64 strings back into readable text. It solves the everyday problem of moving text through systems that expect plain ASCII, such as embedding small payloads in data URIs, config files, or API requests, and quickly inspecting an encoded value someone has handed you.
It is built for developers, QA engineers, and anyone debugging encoded data who wants a fast answer without installing anything. The tool is completely free and runs entirely in your browser, so the text you paste is encoded or decoded locally and never uploaded to a server.
Yes. All encoding and decoding happens in your browser using local JavaScript. Nothing you paste is sent to or stored on any server.
Base64 represents binary or text data using a 64-character ASCII set, making it safe to transmit through channels that only handle plain text, such as data URIs, JSON fields, and email headers.
That usually means the input was not valid Base64, was truncated, or originally encoded non-text binary data. Check that you pasted the complete, correct string.
Yes. Unicode text is encoded based on its UTF-8 bytes, so accented letters and emoji round-trip correctly when you encode and then decode them.
There is no fixed cap. Conversions are free and run locally, though very large inputs depend on your device's available memory.