Free, private AI tools that run in your browser

RunAIToolkit provides free, private AI tools for token estimation, Markdown cleanup, image compression, and prompt building. No sign-up, no uploads, and no API keys.

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  1. AI Token & Cost Estimator Tool
  2. Prompt & Markdown Cleaner Tool
  3. AI Image Grid Splitter Tool
  4. LLM Context Window Calculator Tool
  5. AI Prompt Compressor Tool
  6. AI Image Aspect Ratio Calculator Tool
  7. AI Image Compressor & Converter Tool
  8. Midjourney & FLUX Prompt Builder Tool
  9. ChatGPT / OpenAI Token Calculator
  10. Claude Token Calculator

About

RunAIToolkit offers fast, private utilities for better AI work. The tools let users estimate tokens, prepare Markdown, compress images, and build AI image prompts in their browser. There is no sign-up and no uploads. The company operates with local processing, zero data retention, and is free to use. Tokenization, text transformation, image decoding, Canvas cropping, and ZIP creation happen on the current device.

RunAIToolkit turns repetitive AI workflow steps into focused utilities for creators, developers, operators, and anyone who works with AI regularly. There is no account setup, dashboard, or project configuration between the user and the task. The company does not save inputs and requires no API keys. The first release includes token and cost estimation, prompt and Markdown cleanup, AI grid splitting, and social-ratio cropping. RunAIToolkit also provides practical AI guides. Every article includes practical steps, clear limits, and a related free tool. The website is available in English, Simplified Chinese, Traditional Chinese, Japanese, and Korean.

Products

12 items. See all →

  • AI Token & Cost Estimator Tool
  • Prompt & Markdown Cleaner Tool
  • AI Image Grid Splitter Tool
  • LLM Context Window Calculator Tool
  • AI Prompt Compressor Tool
  • AI Image Aspect Ratio Calculator Tool
  • AI Image Compressor & Converter Tool
  • Midjourney & FLUX Prompt Builder Tool

What we do

  1. AI Token & Cost Estimator

    Estimate tokens by provider including ChatGPT, Claude, Gemini, and DeepSeek. The tool uses 100% local processing with o200k_base encoding, separates estimated input and output, and applies standard per-million-token prices. It does not send pasted content to a processing API or save it to an account.

  2. Prompt & Markdown Cleaner

    Remove chatty wrappers, code fences, and excess whitespace in one click. Options include Remove AI pleasantries, Remove code fences, Compact blank lines, and JSON Stringified. The tool processes text 100% locally with nothing uploaded.

  3. AI Image Grid Splitter

    Split 2×2 grids or crop a single image for social platforms, locally. Grid mode divides a 2×2 composition from tools such as Midjourney or Flux into four separate images. Crop mode trims one image from the center to a common social-media aspect ratio including 1:1, 4:5, 16:9, and 9:16. Accepts JPG, PNG, and WebP files up to 30MB.

  4. LLM Context Window Calculator

    Plan system prompts, history, tools, user input, output reserve, and a safety margin inside current long-context models. Model presets include GPT-5.6 Sol with 1,050,000 tokens, Claude Sonnet 4.6 with 1,000,000 tokens, Gemini 3.5 Flash with 1,000,000 tokens, DeepSeek V4 with 1,000,000 tokens, and a 128K preset with 128,000 tokens. It runs locally in the browser and does not upload the input.

  5. AI Prompt Compressor

    Remove redundant spacing and selected filler phrases locally while keeping code fences, URLs, variables, and instruction order visible. Light mode removes whitespace only. Standard mode removes selected filler.

  6. AI Image Aspect Ratio Calculator

    Simplify pixel ratios, calculate matching dimensions, snap to model-friendly multiples, and copy prompt-ready aspect syntax. Presets use a 1536px width and round the other side to a multiple of 64. Processes data 100% locally with nothing uploaded.

  7. ChatGPT to Markdown Converter

    Convert copied ChatGPT, Claude, or Gemini answers into portable Markdown. Runs in the current browser with no account, upload, or API key. Processes data 100% locally with nothing uploaded.

  8. AI Image Compressor & Converter

    Resize, compress, and convert generated images without uploading them. Accepts up to twelve PNG, JPEG, WebP, or AVIF source files and produces WebP, JPEG, PNG, or browser-supported AVIF files. Offers an optional maximum width and best-effort target size. Runs entirely in the current browser with no account, upload, or API key.

Contact

Reach us
hello@runaitoolkit.com
Official site
runaitoolkit.com