Most commonly in two-factor authentication apps, which store the shared secret as a Base32 string because it is easy to type and case-insensitive.
Yes. Base32 Encode / Decode is completely free with no sign-up, no watermarks and no usage limits.
No. Base32 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 Base32 or decode Base32 back to text, in your browser.