Uploading a locked PDF to unlock it makes no sense
The PDFs that arrive password-protected are usually documents about you — bank statements, payslips, tax letters, lab results. The classic online unlocker asks you to send exactly that file, together with its password, to somebody's server. Protecting a document and then handing both the document and the key to an unknown machine defeats the whole point. Here the decryption runs in your browser: nothing is transmitted, because there is nowhere to transmit it to.
Type the password, drop the file, and you get a clean copy that opens without asking — print and copy restrictions are removed along with the encryption. Every standard PDF scheme is supported, including AES-256. And if you mistype the password, just fix it in the field and press Enter — the tool retries with the same file, no re-dropping.