Private Base64 decoding: no upload required

Popular Base64 websites still ask you to upload files so a remote server can encode or decode them. That is convenient for them—and risky for you when the payload is a JWT, a PEM private key, a payroll CSV, or a customer PDF.

What “private by design” means here

On Base64Encoding, text and local files are converted with JavaScript in your browser. The bytes never leave your device for the normal encode/decode path. That matches how careful developers already work with secrets.

Why this matters in Europe

Under GDPR, sending personal data to an unnecessary third-party processor creates accountability you do not need for a 30-second conversion. A client-side tool reduces that surface: no upload, no retention window, no “we delete after 15 minutes” promise to trust.

What we still do on a server

A few optional network tools (remote URL fetch, gzip probe, HTTP client) call our API. Encoding and decoding of pasted text and local files do not.

Tools that go beyond classic competitors

Besides private encode/decode, this site ships developer utilities many upload-era tools never built:

• Repair malformed Base64
• Standard detector (8 variants including IMAP and OpenPGP)
• JWT decoder
• Base64 size calculator
• Compare Base64 strings
• European charset detection
• Compress image and Gzip compress without uploading (saves prepaid mobile data)

If you currently use an upload-based decoder for daily work, switch the default to a browser-local tool—and keep production secrets out of shared machines either way.