Free browser-based developer utilities

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TokenPulse AI is a free toolkit for AI developers - estimate tokens and LLM cost, sharpen prompts, compare model benchmarks, and convert image ratios and formats. Everything runs locally in your browser.

Start calculating Compare models

Tools: 04
Cost: Free
Runs: Local

The toolkit

Four tools, one place

Jump straight to any utility. Each one is fast, keyboard-friendly, and fully client-side.

Token & Cost CalculatorEstimate tokens and LLM cost across popular models with editable pricing.Open tool Prompt OptimizerRun a local checklist and get a cleaner, better-structured prompt.Open tool Benchmark ComparisonCompare popular models by score, context, and cost with filters and sorting.Open tool Image Ratio & FormatFind aspect ratios, match presets, and convert formats locally.Open tool

Trending AI Intelligence

A curated, source-linked snapshot of the open-source AI repositories and record-breaking papers developers are watching - DeepSeek, Qwen, frontier agents, reasoning, and evaluation benchmarks.

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Tool 01 · Token & Cost Calculator

AI Token & Cost Calculator

Paste a prompt and estimate how many tokens it roughly uses, then see what that would cost across popular models. Pricing is editable and based on approximate per-million-token rates.

Prompt text

Model

Input price

/1M

Output price

/1M

Input tokens

Output tokens

Est. output tokens0auto-set to ~40% of input

Est. input tokens0editable

Tokens / $1M prices$0.00 totalinput + output

Input cost$0.00estimate

Output cost$0.00estimate

Token estimate1rough range 1 - 1 · 0 chars · 0 words

How it works: this is a client-side heuristic, not a real model tokenizer. It roughly estimates ~4 characters per token and ~1.33 tokens per word, averaging the two. Real token counts vary by tokenizer, language, and formatting. Enter your own token totals or edit prices to refine. Pricing shown is illustrative and changes often - verify the provider's current rates.

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Tool 02 · Prompt Optimizer

Prompt Optimizer

Run a quick local checklist against your prompt and get a cleaner, better-structured version. Everything here runs in your browser - no AI model is called and nothing leaves your device.

Your prompt

1 of 6 checks passing

Local checklist

Role or context is definedTell the model who it is being and who it is for.
Task is specific and single-purposeStart with one clear verb for the main task.
Output format is specifiedSay how you want the answer shaped (bullets, table, JSON…).
Constraints or limits are statedAdd word count, tone, or audience limits.
An example or sample is includedA worked example removes ambiguity fast.
No vague filler words

Improved prompt preview

Paste a prompt above to generate an improved version.

The improved version is a local template built from the checklist above - it restructures your prompt, it does not rewrite it with a model. Fill in the details it flags to get the most out of it.

Tool 03 · Benchmark Comparison

LLM Benchmark Comparison

Compare popular models side by side. Values are illustrative reference scores for orientation, not a buying decision - benchmark results vary by version and test setting, change over time, and should be verified against official sources.

Filter:

Model	Provider
o1	OpenAI	200K	92.3	94	80.2
Claude 3.7 Sonnet	Anthropic	200K	90.2	92.4	77.2
GPT-4o	OpenAI	128K	88.7	90.2	73.1
DeepSeek V3Open	DeepSeek	128K	88.5	82.6	69.4
Gemini 2.0 Flash	Google	1,048K	87.2	88.4	71.5
Claude 3.5 Haiku	Anthropic	200K	86	84.3	66.1
Llama 3.3 70BOpen	Meta	128K	86	88.4	65.5
Gemini 1.5 Pro	Google	2,048K	85.9	84.1	68.2
Mistral Large 2Open	Mistral	131K	84	79.5	62.1
GPT-4o mini	OpenAI	128K	82	87.2	67.4

Scores are per-metric, higher is better. Benchmark scores are reference-only and illustrative; they update as new model versions ship.Tap any numeric column header to sort, or use the filters above to narrow the field.

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Tool 04 · Image Aspect Ratio & Format

Image Aspect Ratio & Format Utility

Find the exact ratio of any image, match it to a target preset, preview the resulting dimensions, and convert or crop to a new format - all locally in your browser.

Upload an image (optional)

Width

Height

Target preset

Fit mode

Export format

Aspect ratio16:9

Source1920 × 1080px

Target (16:9)1920 × 1080px

Preview

Upload an image to enable the download. Cropping and conversion run entirely in your browser via the canvas API - no files are sent anywhere.

FAQ

Frequently asked questions

How does the AI token calculator estimate tokens?

It uses a transparent client-side heuristic: roughly 4 characters per token and about 1.33 tokens per word, then averages the two. It is an estimate, not a real model tokenizer, so counts vary by tokenizer, language, and formatting. You can override the token totals or prices yourself.

Are the cost figures accurate?

They are approximate reference rates per million tokens, and they change frequently. Always confirm current pricing with the provider before relying on a figure for budgeting or billing.

Does the prompt optimizer call an AI model?

No. It runs a local checklist against your text and builds a structured template from it. Everything happens in your browser and nothing leaves your device.

Are the benchmark scores real?

They are illustrative reference values for orientation, clearly labeled as such. Benchmark results vary by model version and test setup and update over time - verify against official sources before making decisions.

Is my image uploaded anywhere?

No. Image processing, aspect-ratio math, and format conversion all run locally in your browser. Files are never sent to a server.

Do I need an account or API key?

No. Every tool works entirely in the browser with no sign-up and no external API keys.

Privacy policy

TokenPulse AI is a client-side toolkit. Your prompts, images, and calculations are processed in your browser and are not uploaded to our servers. We do not require an account and do not collect personal information to use the tools. Third-party advertising networks may serve ads on this site and may use cookies to measure performance.

Terms of use

The tools are provided free of charge for general informational and development purposes. Estimates and comparisons are approximate and provided without warranty. You are responsible for verifying any figures you rely on, including current provider pricing and official benchmark results.

Advertising disclosure

This site may display advertisements from third-party networks such as Google AdSense, Carbon, or Mediavine. Ad slots are clearly labeled "Advertisement" or "Sponsor". Advertisers do not influence the tools, data, or recommendations shown here, and we do not make claims about revenue or traffic. Ads are placeholders until a network is integrated.