Base64 Encoder / Decoder
Tip: JWT uses Base64URL. Paste one part (between dots) to decode.
What is Base64?
Base64 is a text-based encoding that converts binary data into ASCII characters. It’s commonly used to embed small files or safely transmit data in JSON, URLs, emails, or HTTP payloads.
Use this tool to encode plain text to Base64 or decode Base64 back to readable text. Everything runs locally in your browser.
How to use the Base64 tool
- Paste your text in the Input field.
- Click Encode to get a Base64 string (or Decode to convert Base64 back to text).
- Use Copy to copy the output.
Related guides
Learn the workflow behind this tool and what to check next.
How to inspect JWT auth issues
A JWT troubleshooting flow for checking token claims, time values, permissions, and signing assumptions without treating decoding as verification.
How to validate a domain before launch
A launch workflow for confirming DNS records, domain ownership signals, SSL coverage, and security headers on the public endpoint.
Base64 checks before moving encoded data between systems
Base64 changes binary or text data into a transport-safe representation. It does not encrypt, authenticate, or validate the original content.
Text encoding
Use the expected character encoding, normally UTF-8, before encoding text so non-ASCII characters decode consistently.
Variant and padding
Distinguish standard Base64 from URL-safe Base64 and preserve or remove padding only when the receiving format requires it.
Binary integrity
For files and binary payloads, compare a checksum or byte length after decoding instead of judging the result as text.
No secrecy
Treat encoded passwords, tokens, certificates, and personal data as exposed because anyone can reverse Base64 without a key.
Privacy and usage
Built for quick checks without an account
Toolinix tools are designed for short developer tasks: paste a safe sample, inspect the result, copy what you need, and move on.
No login required
You can use the tools without creating an account, subscribing to a newsletter, or saving a workspace.
Local when possible
Formatters, generators, encoders, and text utilities generally run in your browser. Network diagnostics may need a server-assisted lookup to check public URLs, domains, or IPs.
Keep secrets out
Do not paste production passwords, private keys, access tokens, customer records, or regulated data into online tools unless your own security policy allows it.
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