Everything happens on your device, your file is never uploaded.
Yes. NamahaPDF lets you click existing text and replace, add, or erase it in place — it re-embeds the document's original font where possible, so edited text keeps the original look.
You can insert or move images, fill form fields, draw annotations, add a signature, redact sensitive content, and reorder or rotate pages, all in one editor.
With NamahaPDF, yes: editing runs entirely in your browser using an in-house engine, so your file is never uploaded to a server.