Local Base64 Encoder — No Server, No Data Leaks
Base64 encoding is often used with sensitive data — API tokens, auth credentials, binary blobs, and data URIs. Pasting that data into an online encoder that sends it to a server is a security risk. This encoder runs entirely in your browser — your data is encoded or decoded locally and never transmitted anywhere.
Developers frequently encode JWT payloads, API keys, and binary data to Base64. A local encoder means credentials and tokens never leave your machine.
How to use it
- Switch between Encode and Decode mode.
- Paste your text or Base64 string into the input.
- The result appears instantly — no button needed.
- Click Copy to copy the output to your clipboard.
Why it matters
- Encode and decode Base64 locally — no server involved.
- Handles text strings and file encoding (data URIs).
- Your data never leaves your browser.
- Free with no limits, no signup.
- Works offline once the page is loaded.