Base64 Encoder

Base64 Encoder converts plain text or file bytes into Base64 ASCII strings safe for JSON fields, URL parameters, and email MIME parts.

Encoding happens locally—API keys and private certificate fragments in test strings stay off server logs.

Backend tickets ask for Base64 of a small config blob—encode here instead of openssl one-liners on locked corporate laptops.

Frontend devs embed tiny icons as data URLs in prototypes—Base64 encode bridges binary to CSS.

• Encode Basic auth username:password pairs for curl tests
• Convert small images to data URLs in HTML prototypes
• Prepare binary payloads for webhook test consoles
• Encode UTF-8 text for inclusion in JSON string fields
• Debug JWT segments after decoding header separately

1. 1Enter text or upload a small file if supported.
2. 2Click Encode to generate the Base64 string.
3. 3Copy output to clipboard or API client.
4. 4Verify length and padding characters (=) when pasting into strict validators.
5. 5Use Base64 Decoder to reverse when verifying round trips.

• Base64 expands size ~33%—do not use for large file transport when URLs allow binary upload.
• URL-safe Base64 variants replace + and /—confirm which variant your API expects.
• Clear the panel after encoding secrets before demos.
• Pair with JWT Decoder when inspecting token payloads—not the signature.

• Encoding is not encryption—anyone can decode Base64.
• Huge files may exceed browser memory for string conversion.
• Common mistake — double-encoding already Base64 data: decode first to inspect raw content.