100% local Base64 encoding and decoding — no data sent, no sign-up
This Base64 tool runs entirely in your browser using native JavaScript APIs (btoa, atob, TextEncoder, FileReader). No data — text, file, or image — is ever transmitted to a server. Ideal for safely encoding sensitive information.
Need the full tool with every Base64 option?
Open the Base64 tool →Paste a Data URI or raw Base64 below, then click Decode.
Many online tools send your data to their servers for processing. This raises privacy concerns, especially for:
With Flowfiles, the JavaScript runs entirely client-side. You can verify in your browser's Network tab that no request is made during conversion.
Open your browser developer tools (F12), go to the Network tab. Perform a conversion. You will see that no network request is made with your text or file.
Once the page is loaded, yes. The conversion uses btoa(), atob(), TextEncoder, and FileReader — all native browser APIs with no network dependency.
The conversion is local, so your data never leaves your device. However, remember that Base64 is reversible — it is not encryption. Anyone who sees the Base64 string can decode it.