Search tools
Find the right browser-based utility by name, category, or task.
LLM Token Counter
Estimate prompt tokens, characters, words, and rough model budget before sending text to an AI model. Runs in your browser with no account required.
AI ToolsLLM API Cost Calculator
Estimate AI API spend from input tokens, output tokens, and common model pricing presets. Runs in your browser with no account required.
AI ToolsContext Window Checker
Check whether a prompt is likely to fit within a selected model context window. Runs in your browser with no account required.
AI ToolsPrompt Diff Checker
Compare two prompt versions line by line before shipping a prompt change. Runs in your browser with no account required.
AI ToolsJSON Schema Builder
Generate a starter JSON Schema from sample JSON for structured AI outputs and validation. Runs in your browser with no account required.
AI ToolsJSONL Validator
Validate JSONL datasets line by line for AI fine-tuning, evaluation, and data pipelines. Runs in your browser with no account required.
AI ToolsInvisible Character Cleaner
Remove zero-width and hidden Unicode characters from prompts, copy, and pasted text. Runs in your browser with no account required.
Developer ToolsJSON Formatter
Format and pretty-print JSON so it is easier to read, debug, copy, and share. Runs in your browser with no account required.
Developer ToolsJSON Validator
Validate JSON syntax and get line-aware error guidance for malformed data. Runs in your browser with no account required.
Developer ToolsJSON to YAML
Convert JSON into readable YAML for configs, docs, and infrastructure files. Runs in your browser with no account required.
Developer ToolsYAML to JSON
Convert YAML into JSON for APIs, scripts, and developer workflows. Runs in your browser with no account required.
Developer ToolsCSV to JSON
Convert CSV rows into JSON arrays for APIs, prototyping, and data cleanup. Runs in your browser with no account required.
Developer ToolsJWT Decoder
Decode JWT header and payload locally so you can inspect claims without uploading tokens. Runs in your browser with no account required.
Developer ToolsBase64 Encoder / Decoder
Encode or decode Base64 text for tokens, configs, and quick debugging. Runs in your browser with no account required.
Developer ToolsURL Encoder / Decoder
Encode or decode URL components for query strings, tracking links, and debugging. Runs in your browser with no account required.
Developer ToolsTimestamp Converter
Convert Unix timestamps to UTC, local time, seconds, and milliseconds. Runs in your browser with no account required.
SEO & Marketing ToolsUTM Builder
Build tagged campaign URLs for analytics, ads, newsletters, and launch tracking. Runs in your browser with no account required.
SEO & Marketing ToolsSERP Snippet Preview
Preview how a title, URL, and meta description may appear in Google search results. Runs in your browser with no account required.
SEO & Marketing ToolsMeta Tag Generator
Generate basic title, description, and canonical tags for SEO-ready pages. Runs in your browser with no account required.
SEO & Marketing ToolsOpen Graph Preview
Preview social sharing metadata and generate common Open Graph tags. Runs in your browser with no account required.
SEO & Marketing ToolsTwitter/X Card Preview
Preview X card metadata and generate summary_large_image tags. Runs in your browser with no account required.
SEO & Marketing ToolsSlug Generator
Generate clean lowercase URL slugs from titles, page names, and campaign ideas. Runs in your browser with no account required.
SEO & Marketing ToolsWord Counter
Count words, characters, sentences, and estimated reading time for SEO and content writing. Runs in your browser with no account required.
Business CalculatorsROAS Calculator
Calculate return on ad spend from revenue and advertising cost. Runs in your browser with no account required.
Business CalculatorsProfit Margin Calculator
Calculate profit and margin from revenue and cost. Runs in your browser with no account required.
Business CalculatorsCPM Calculator
Calculate cost per thousand impressions for advertising campaigns. Runs in your browser with no account required.
Business CalculatorsCPC Calculator
Calculate cost per click from ad spend and clicks. Runs in your browser with no account required.
Business CalculatorsCPA Calculator
Calculate cost per acquisition or conversion. Runs in your browser with no account required.
Business CalculatorsCAC Calculator
Calculate customer acquisition cost from sales and marketing spend. Runs in your browser with no account required.
Business CalculatorsLTV Calculator
Estimate customer lifetime value from ARPA, gross margin, and churn. Runs in your browser with no account required.