LLM Token Counter & API Pricing Calculator

Text & Code

Calculate token counts, context window usage, and estimated API inference costs for GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro.

100% Client-Side: Tokenization runs in browser without sending text to AI APIs.

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Estimated Tokens72

Total Words37

Total Characters272

GPT-4o Input Cost$0.000180

Prompt Text or System Instructions

Model Context & Cost Comparison

OpenAI GPT-4o$0.000180

128k Context Window0.056% used

Claude 3.5 Sonnet$0.000216

200k Context Window0.036% used

Google Gemini 1.5 Flash$0.000005

2M Context Window0.0036% used

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Engineering Guide & Architecture

How to Use the LLM Token Counter & API Pricing Calculator

Calculate token counts, context window usage, and estimated API inference costs for GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro. Designed specifically for software engineers, site reliability teams, and backend architects who require instant, deterministic conversions without exposing proprietary data over public networks.

01. Paste or Type Input

Enter your raw string, payload, expression, or token into the editor pane. The tool monitors input events and processes syntax updates in real time.

02. In-Memory Validation

Parsing occurs strictly inside your local browser runtime via Web Crypto, WebAssembly, and native ECMAScript engines without telemetry or network calls.

03. 1-Click Code Generation

Copy formatted outputs, minified strings, or generated TypeScript interfaces and Zod validation schemas directly into your codebase.

Common Errors & Edge Cases Handled

Trailing Commas: Detects and flags invalid trailing commas in JSON arrays or key-value object trees before production failure.
Quote Delimiters: Identifies unescaped single quotes, smart quotes, and unquoted keys that break RFC 8259 compliance.
BigInt Precision: Warns when 64-bit integer numbers exceed standard JavaScript safe integer limits (9,007,199,254,740,991).
Character Encodings: Safely parses UTF-8, UTF-16 surrogate pairs, newlines, tabs, and escape sequences without truncation.

Frequently Asked Questions

Is my data, API key, or JWT payload logged on your servers?

No. Unlike other online formatters that send payloads to remote backends, all 12 DevHubTools developer utilities execute 100% locally in your browser memory. We maintain zero telemetry, zero input analytics, and zero server logging.

Can I format or validate multi-megabyte payloads?

Yes. Since processing is performed client-side using browser memory, payload size is only constrained by your system RAM, completely bypassing standard HTTP 413 Payload Too Large limits.