Base64 Encode/Decode
Input
Output
How to use
- Paste plain text, JSON, or Base64 input, then choose encode or decode mode based on your workflow.
- Check padding and URL-safe variants because `+`, `/`, and `=` handling differs between systems.
- Verify by round-tripping output (encode then decode) and comparing with the original source.
FAQ
What is base64 encode decode used for?
Base64 Encode/Decode is used to represent binary or structured data as ASCII-safe text for transport in APIs, tokens, and files.
Is my data uploaded?
No. Processing runs locally in your browser.
Is Base64 encryption?
No. Base64 is encoding only. Anyone can decode it without a secret key.
Introduction
A base64 encode decode tool helps developers move binary-like content through text-only channels without breaking payload structure. It is especially useful in REST APIs, email bodies, and token debugging where raw bytes are not safe to send directly.
What is base64 encode decode?
Base64 converts data into a limited character set so transport layers treat it as plain text.
The decoder reverses that mapping, restoring the original bytes when input is valid.
You will also see URL-safe Base64 variants that replace + and /, so mode mismatch is a common source of errors.
Key Features
Fast encode/decode switching helps you inspect both source and transformed values in one place.
Deterministic output makes debugging request signatures and serialized payloads more reliable.
Local processing is practical when testing sensitive tokens, private fixtures, or internal documents.
Common Use Cases
- Decoding JWT segments or callback payload samples during API troubleshooting.
- Encoding binary snippets before sending them in JSON fields.
- Validating interoperability between backend libraries that implement different Base64 variants.
Best Practices
- Confirm whether the destination expects standard Base64 or URL-safe Base64.
- Keep test vectors with known input/output pairs to catch regressions after library upgrades.
- Never treat Base64 text as protected data; apply real encryption for secrets.