No. Base64 only re-encodes data into text and is fully reversible by anyone. Never use it to protect secrets.
Base64 represents every three bytes as four characters, so the output is roughly 33% larger than the input.
Yes. Base64 Encode/Decode is completely free with no sign-up, no watermarks and no usage limits.
No. Base64 Encode/Decode runs entirely in your browser, so your data never leaves your device.
Only your device's available memory — there are no server-side limits because nothing is uploaded.
Encode text to Base64 or decode Base64 back to text.