Encoding stops special characters from being interpreted as markup, which keeps your page from breaking and helps prevent cross-site scripting.
Yes. HTML Encode / Decode is completely free with no sign-up, no watermarks and no usage limits.
No. HTML 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.
Escape text into HTML entities or decode entities back to text, in your browser.