Base64 encoder / decoder

Encode and decode Base64 strings instantly. Free Base64 converter for UTF-8 text. Runs locally with no upload.

Base64 encoding represents binary data as ASCII text safe for email, JSON fields, data URIs, and HTTP headers. Developers encounter it in Basic authentication schemes, embedded images, JWT segments, and legacy XML payloads. Qikot's encoder converts UTF-8 text to Base64 and back using browser APIs — TextEncoder, btoa, and atob with proper Unicode handling — without sending content to remote decoders that might log credentials.

Encoding is not encryption. Anyone can decode Base64 strings, so never treat encoded passwords or API keys as protected. Use encoding only for transport or format constraints, then layer TLS and proper secret management for security. When debugging JWTs, decode the header and payload segments with this tool, then validate signatures with appropriate libraries — never trust decoded claims without cryptographic verification.

Pair Base64 workflows with JSON formatting when inspecting nested API responses that embed encoded blobs. Markdown documentation often includes Base64 data URIs for small icons; our markdown editor previews resulting HTML locally. Password and UUID generators supply test credentials separate from encoded transport strings.

Invalid decode input produces clear errors for padding mistakes or non-Base64 characters — common when copying from PDFs or chat apps that introduce line breaks. Strip whitespace and retry. For large files, dedicated file encoders may be more appropriate; this tool optimizes for short text snippets developers paste during debugging.

Teams monitoring authenticated APIs should still run external uptime checks on endpoints after rotating Basic auth credentials encoded in integration configs.

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