The tool uses AI to identify and remove filler phrases, redundant instructions, unnecessary preamble, and wordy constructions from your prompts. Three modes are available: Light (20-30% reduction, preserves everything), Moderate (40-55%, condenses repetition), and Aggressive (60-75%, strips to essentials). The compressed prompt retains the same functional meaning so your AI produces identical quality output.

Not with Light or Moderate modes. A production study of 358 compression runs found that Moderate compression (50% token retention) achieves a 27.9% total cost reduction with no measurable accuracy loss. Aggressive compression can occasionally increase total cost if Claude produces verbose outputs to compensate for lost context — use it only for simple, one-off tasks.

It depends on your usage. Claude Sonnet 4.6 costs $3 per million input tokens. If you send 10,000 API calls per month and compress by 40%, that saves roughly $12-15 per month on Sonnet alone. On Claude Opus 4.6 ($15 per million tokens), the same compression saves $60-75 per month. The built-in Cost Projector shows your exact savings based on your compression results.

Moderate for most prompts — it hits the research-validated sweet spot of maximum savings with zero quality loss. Use Light for prompts with strict formatting requirements or many examples that must stay intact. Use Aggressive only for simple tasks where you want maximum token savings and the prompt is straightforward.

Yes. Free users get 3 compressions per day with up to 8,000 characters of input — no signup required. Pro users get unlimited compressions and can input prompts up to 50,000 characters. A Chrome extension is coming soon that lets you compress prompts directly inside Claude.ai.

Yes. While the tool is optimized for Claude prompt patterns, the compression techniques work for any LLM prompt. The Cost by Model tab shows savings across Claude Sonnet, Claude Opus, GPT-4o, and Gemini 2.5 Flash so you can see the impact regardless of which model you use.