browser extensions / AI tools
best token counter extensions — 2026.
counting tokens manually is a chore. context windows fill up silently. API costs add up fast. here is an honest comparison of how to track tokens in ChatGPT, Claude, Gemini and other AI assistants — live, in the browser.
why token counting matters
- context limits are silent — when your conversation exceeds the model's context window, earlier messages are dropped without warning. you only notice when the AI forgets things.
- API costs are per-token — if you use the API, every input and output token is billed. a counter running in the browser tells you before you send, not after the invoice.
- prompt engineering needs feedback — compressing a system prompt from 2,000 tokens to 800 changes cost significantly. without a live counter, you are guessing.
- AI assistants hide the number — ChatGPT, Claude, and Gemini web UIs do not show live token counts. you have to install something or copy-paste to an external tool.
one extension we make.
tokcount is a free browser extension that adds a live token counter to the AI assistants you already use. no account, no data collection, no cost.
live token count + estimated API cost while you chat with major AI assistants — no account, no sync, no cost.
- real-time token counter in the chat input and response area
- estimated cost per message for major API pricing tiers
- works on ChatGPT, Claude, Gemini, Mistral and others
- nothing sent to any server — counts locally in your browser
- chrome + firefox + edge — only dedicated counter on all three
copy your prompt, open a tokenizer tool, paste it in, read the number. repeat after every edit.
- breaks your flow on every message
- no real-time feedback while typing
- external tools like tiktoken or OpenAI Tokenizer are standalone — not in your browser
- does not track cumulative conversation context
- works on any text, technically free
feature comparison.
| feature | tokcount (free) | paste-to-tokenizer | ChatGPT built-in | Claude built-in |
|---|---|---|---|---|
| live counter while typing | ✓ yes | ✗ no | ✗ no | ✗ no |
| works in the browser UI | ✓ yes | ✗ separate tab | ~ API playground only | ~ API console only |
| estimated API cost | ✓ yes | ~ manual calc | ✗ no | ✗ no |
| tracks conversation context | ✓ yes | ✗ single paste | ✗ no | ✗ no |
| ChatGPT support | ✓ yes | ✓ any text | ✓ native | ✗ no |
| Claude support | ✓ yes | ✓ any text | ✗ no | ✓ native |
| Gemini support | ✓ yes | ✓ any text | ✗ no | ✗ no |
| no account required | ✓ yes | ✓ yes | ✗ ChatGPT login | ✗ Anthropic login |
| available on Firefox | ✓ yes | ✓ any browser | ✗ no extension | ✗ no extension |
| available on Edge | ✓ yes | ✓ any browser | ✗ no extension | ✗ no extension |
| price | free | free | free (ChatGPT account) | free (Claude account) |
verdict by use case.
AI power user
tokcount
you switch between ChatGPT, Claude and Gemini. one extension that works across all three saves the tab-switching and paste cycle every time you tweak a prompt.
API developer
tokcount + API console
tokcount gives a live estimate in the chat UI while you prototype. the API console gives exact post-call usage in production. use both.
occasional use / one-off
paste-to-tokenizer
if you only need to count tokens once or twice, the OpenAI Tokenizer or tiktoken playground is fine. no install needed for a quick check.
frequently asked questions.
-
Is there a Chrome extension that counts tokens in ChatGPT?
Yes. tokcount by vøiddo is a free Chrome extension that shows a live token count and estimated cost while you type in ChatGPT, Claude, Gemini, Mistral, and other major AI assistants. It installs in one click from the Chrome Web Store — no account or sign-up required. Firefox and Edge versions are also available.
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Does ChatGPT show a token count?
ChatGPT does not show a live token counter in its standard chat interface. The API playground shows token usage after each call, but the main web UI has no real-time count. tokcount adds a persistent live counter overlay to ChatGPT (and other AI assistant sites) so you can see token usage before you send a message.
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Does Claude show token count?
The Claude web interface at claude.ai does not display a live token counter. The API console provides usage data after each call. To see a running token count while chatting on claude.ai, install tokcount — a free browser extension that adds a live counter to Claude and several other AI assistants.
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Why do tokens matter when using AI?
AI language models process text as tokens — roughly 3–4 characters each. Tokens matter for two reasons: cost (API usage is billed per token, so knowing your count helps budget and optimize prompts) and context limit (every AI model has a maximum context window, and exceeding it silently drops earlier parts of the conversation). A token counter lets you stay under the limit and catch unexpectedly long outputs before they cost money.
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Does tokcount work with Firefox and Edge?
Yes. tokcount is available on Chrome (Chrome Web Store), Firefox (Mozilla Add-ons), and Edge (Microsoft Edge Add-ons). It is the only dedicated token-counter extension available across all three major browsers simultaneously.
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Is tokcount free?
Yes, tokcount is completely free. There is no paid tier, no sign-up, and no account required. The extension runs locally in your browser and does not send your text or token counts to any server.
install tokcount free — takes 10 seconds.
live token count + cost estimate in ChatGPT, Claude, Gemini and others. works offline. nothing sent anywhere.
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