Last updated: June 23, 2026
Prompt Token Counter for ChatGPT ("the extension") is built to never see, collect, or transmit what you type. This page explains exactly what the extension does and does not do with your data.
The extension reads the text inside ChatGPT's prompt box, on your device,
and runs it through a local implementation of OpenAI's o200k_base
tokenizer to compute a token count. That computation happens entirely
inside your browser using JavaScript bundled with the extension.
None. The extension does not collect, store, log, or transmit:
On first use, the extension downloads a single static data file —
OpenAI's own published tokenizer vocabulary,
o200k_base.tiktoken, from
openaipublic.blob.core.windows.net (the same file OpenAI's
official tiktoken library downloads). This file contains no
information about you; it is the same file delivered to every user, and
is required so the extension can count tokens exactly rather than
estimate them. After downloading it once, it is cached in your browser's
local storage (IndexedDB) and reused — no further requests are made.
The extension saves your display preferences (whether the counter is
shown, whether to show percentage/cost, your chosen context window size,
an optional price you enter for cost estimates, and the position of the
floating counter) using Chrome's storage API. This data
stays on your device (or syncs via your own Chrome account, the same way
Chrome syncs any extension's settings) and is never sent to us.
We do not sell, rent, or share any data, because we do not collect any. The extension developer has no server and receives no information about how, when, or by whom the extension is used.
If this policy changes, the updated version will be posted at this same URL with a revised "Last updated" date.
Questions about this policy or the extension can be sent to abdel.zakaria@gmail.com.