Developer Utilities
Base64 encoder & decoder
UTF-8 safe in both directions, including the URL-safe variant used by JWTs and OAuth.
Text mode accepts at most 1 MiB of valid UTF-8 and the supported text Data URLs. Binary mode accepts raw Base64/Base64url only and preserves up to 1 MiB of exact bytes. Binary downloads use .bin; content is never rendered or executed.
UTF-8 text survives round trips, including emoji. Decoding refuses invalid UTF-8 bytes instead of replacing them. URL-safe mode replaces + and / with - and _ and omits padding. Text Data URLs use standard Base64; their contents are shown as text and never executed. Processing stays in your browser.
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