Base64 Encoder/Decoder — How to Use Safely
Use the OpenTrojan Base64 tool to encode/decode Unicode-ready standard and URL-safe Base64 locally for inspecting payloads and quick data transport.
Quick Answer
Base64 Encoder/Decoder converts text and bytes to and from standard and URL-safe Base64 entirely in the browser, convenient for importing/exporting data without uploading it.
Definition
Base64 Encoder/Decoder converts data to and from standard and URL-safe Base64 locally in the browser.
What it is
Base64 Encoder/Decoder (/tools/base64/) converts plain text/bytes to Base64 and back, with Unicode and URL-safe variants.
How to use
- Paste the source (text or encoded string) into
/tools/base64/. - Choose encode or decode and the variant (standard vs URL-safe).
- Copy the output.
Interpretation
- Encoding is for transport/representation, not encryption or hashing — anyone can decode it.
- Use it to inspect Base64-embedded payloads (e.g., an encoded blob in a log or email) without trusting their meaning.
- URL-safe vs standard differs in the
+/vs-_alphabet; pick the matching variant to avoid errors.
Limitations
- Decoding arbitrary bytes may not be valid UTF-8; treat output as bytes when the string looks garbled.
- Base64 never authenticates or protects data — never use it as a security control.
Privacy
Conversion runs entirely in the browser — your data is never uploaded, stored, or sent to the network.
Next steps
- Know what encoding is (and is not) → Cryptography hub.
- Decode related token formats safely → Decode JWT safely.
References
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