Free • No signup • Works offline
AI Prompt Minifier — Reduce Tokens & Cost
Last updated: June 1, 2026
Minify your AI prompts to reduce token usage and API costs. Keep context while saving money on GPT and Claude.
Reduction: 0%
How to use this tool
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Paste your large context window or system prompt into the input area.
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Select 'Strip Markdown' or 'Remove Stopwords' if you want aggressive compression.
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Click 'Minify Prompt' and copy the optimized text. Check the saved characters metric to estimate token savings.
Frequently Asked Questions
What is an AI Prompt Minifier?
A prompt minifier compresses your text by stripping unnecessary whitespace, line breaks, and optional stopwords without losing the core semantic meaning. It is designed to optimize your prompt for LLM ingestion.
How does it reduce API costs?
AI providers like OpenAI and Anthropic charge per token (both input and output). By compressing the context window before sending the request, you send fewer tokens, which directly lowers your API bill.
Will removing stopwords confuse the AI?
Generally, no. Large Language Models (like GPT-4 and Claude) are highly capable of understanding semantic intent even when grammar words ('the', 'a', 'is') are missing. However, for highly nuanced creative writing tasks, you may want to disable stopword removal.
Is this prompt optimizer safe and private?
Yes, absolutely. Because the minification logic runs 100% locally in your browser, your proprietary prompts or confidential RAG data never leaves your computer.
Does it work offline?
Yes. Once you load this page, the underlying JavaScript is cached. You can disconnect from the internet and still compress prompts.
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