Gmail Username Checker Tool- Bulk Gmail Username Live/Die Checker

Solve manual Gmail username checking

You have a long list of Gmail usernames and need to know which ones are still available (live), which are already registered (die), and which are malformed. Checking each username manually is slow and impractical for lists of thousands of entries.

What is Gmail Username Checker

Gmail Username Checker is a Windows desktop application that lets you bulk check @gmail.com usernames in a single run. The tool checks whether each username exists by verifying it against Google's data, then sorts results into four clear groups: Available (still free, live), Taken (already registered, die), Invalid (malformed) and Unknown (undetermined). Results are written to separate files per group, so you grab exactly the list you need without manual filtering.

Key features

• Bulk check Gmail usernames: Paste or load a .txt list of @gmail.com addresses and check email exist status all in one run.
• Four status groups: Available (free, live), Taken (registered, die), Invalid (malformed), Unknown (undetermined), each written to its own file.
• Gmail username format filter: Only accepts gmail.com, username length 6-30, valid letters/numbers/dots.
• Up to 3000 threads: Speed up checking for large lists.
• Rotating proxy support: Use multiple proxies in random or sequential mode, with same-proxy-on-retry option.
• Timeout, retry, delay: Control wait time, retry count and pause between attempts.
• Skip duplicates: Automatically remove duplicate emails from the list.
• Pause - Resume - Stop: Flexible controls without losing progress.
• Session and checkpoint: Reload a previous session to continue where you left off.
• Per-group export: Export Available, Taken, Invalid, Unknown or All lists, and open files directly inside the app.
• Vietnamese and English UI: Switch the interface language; settings are remembered between runs.

Best for

• MMO workers and sellers who need to check email exist and filter Gmail usernames that are still live.
• Agencies managing many Gmail accounts that need to sort large username lists quickly.
• Data handlers who need to split usernames into available (live), registered (die) and malformed files.
• Anyone who bought, traded or swapped a Gmail list and wants to know which usernames are live or die.

Not ideal for

• Checking email services other than @gmail.com (no Google Workspace or other domains).
• Logging into Gmail accounts or checking passwords.
• Running on macOS or Linux (currently Windows only).

How it works

1. Prepare your list: Create a .txt file with one @gmail.com email per line, or paste into the app.
2. Configure: Choose threads, timeout, retry, delay, proxy mode, and skip-duplicates.
3. Start checking: Press Start. The app runs multi-threaded and sorts each username into Available, Taken, Invalid or Unknown.
4. Monitor progress: Watch counts in real time. Pause, Resume or Stop as needed.
5. Get results: Open the output folder with per-group files (Available.txt, Taken.txt, Invalid.txt, Unknown.txt, All.txt).
6. Resume a previous session (optional): Reload a previous session to finish remaining items.