Contact person: Business Client

Phone:Show

Email:Show

Location: Bangalore, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a small tool that lets me upload a single CSV full of phone numbers and returns only the ones that actually have a WhatsApp account. My workflow is simple: drag-and-drop or select the CSV, press “start”, wait for the check to finish, then download the clean list (CSV or plain text is fine).

Accuracy and speed matter more to me than fancy UI, but I do want a progress bar or status counter so I know the script hasn’t stalled. I’ll be running this on Windows, so an executable, Python script with [login to view URL], or even a lightweight web page running locally behind XAMPP will work—whichever you’re most comfortable delivering.

Please make sure the tool:
• Reads numbers only from the uploaded CSV, ignoring empty rows or obvious text headers.
• Queries WhatsApp reliably without risking my own account (use a safe-login or API workaround you’ve used before).
• Exports the filtered list in the same order or clearly indicates if sorting has changed.

If you already have something similar, feel free to demo; otherwise let me know roughly how long a fresh build will take and any libraries or services you expect me to set up in advance." (client-provided description)