Every LLM API bills by the token, but 'how many tokens is this prompt? ' is surprisingly hard to answer, tokenization isn't words or characters. The GigAI Token Counter runs the real OpenAI BPE tokenizer (o200k for GPT-4o/4. 1/o-series, cl100k for GPT-3.
Every LLM API bills by the token, but 'how many tokens is this prompt?' is surprisingly hard to answer, tokenization isn't words or characters. The GigAI Token Counter runs the real OpenAI BPE tokenizer (o200k for GPT-4o/4.1/o-series, cl100k for GPT-3.5) directly in your browser for an exact count, and provides a clearly-labelled estimate for Claude and Gemini, whose tokenizers aren't publicly available. Paste any prompt, system message or document and a live table shows the token count and input cost for every model side by side, plus the percentage of each model's context window you're using. Add an expected reply length to see the full per-call cost including output tokens. Everything runs locally (your prompts never leave your device) and the OpenAI tokenizer is loaded only when you need it, so the page stays fast.
Last updated
Drop in a prompt, system message or document. The OpenAI tokenizer loads on first use and counts run live as you type.
See the token count and input cost for every model. OpenAI counts are exact. Claude and Gemini are marked as estimates.
Enter roughly how many tokens the model will reply with to include output-token pricing and get the full per-call cost.
Compare costs and context usage, then pick the cheapest model that fits your prompt and quality needs.
Runs the real BPE tokenizer (o200k / cl100k) in your browser, not a chars÷4 guess, so your GPT-4o and GPT-4.1 counts are accurate.
One paste shows token count and input cost for GPT-4o, GPT-4.1, o4-mini, Claude and Gemini at once, so you can pick the cheapest fit.
Add an expected reply length and it factors in output-token pricing to estimate the total cost of a request, not just the prompt.
See what percentage of each model's context window your prompt takes, so you know how much room is left for the conversation.
Estimate what a feature will cost per request across models before you write the integration, and spot when a mini model is plenty.
See exactly how many tokens a system prompt or document adds, and trim what you don't need to cut cost and stay within the context window.
Your prompts often contain proprietary instructions or data. Here they're tokenized locally in your browser and never uploaded.
Count characters with and without spaces, plus words, bytes and lines, and check your text live against Twitter/X, meta title, meta description and SMS limits, 100% in your browser.
Count words, characters, sentences, paragraphs and reading time live as you type or paste, with a keyword breakdown and platform length limits. 100% in your browser.
Format, validate and minify JSON in your browser with pinpoint error line + column, jump-to-error, key sorting and live editing: nothing is uploaded.
Compare two texts side by side and highlight every added, removed and changed line, word or character, with unified or split view, ignore-whitespace and ignore-case, all in your browser.
Generate scannable 1D barcodes (CODE128, EAN-13, UPC-A, CODE39, ITF-14, MSI, pharmacode and Codabar) live in your browser, with per-format validation and PNG or SVG export. Nothing is uploaded.
Decode Base64 back to text or a file instantly: Unicode-safe, auto-detects URL-safe input, sniffs binary data and offers a download. Runs fully in your browser, nothing uploaded.
ai-toolsThe same AI can give you a vague, generic answer or a genuinely useful one, and the difference is almost always you. Here are the prompting habits that actually move the needle, with copy-paste templates.
ai-toolsEvery AI model reads, thinks, and charges in tokens. Not words. This is what a token actually is, why 'how many tokens is this?' is weirdly hard to answer, and how to check before you pay.
ai-toolsNo math, no hype: just a clear, honest explanation of what an LLM like ChatGPT is really doing when it answers you, why it sounds so confident, and why it sometimes makes things up.
Everything runs 100% in your browser. Your files are never uploaded to a server, never stored, and never seen by anyone but you.
Free, private and instant. LLM Token Counter runs right in your browser.
