Prompt Compression Analyzer
Paste your system prompt to get specific token-reduction recommendations. No API key required — all analysis runs locally in your browser.
How to Use
Paste your system prompt
Paste the system prompt you want to optimize. All analysis runs locally in your browser — your prompt is never sent to any server.
Review flagged issues
Each issue shows severity, a description of the problem, and estimated token savings. High-severity issues have the biggest impact.
Calculate monthly savings
Enter your model and number of calls per month to see the dollar impact of each optimization at your scale.
Apply suggestions
Edit your prompt directly based on the recommendations. Re-paste to see the updated analysis.
Why prompt length matters at scale
System prompts are paid for on every API call. A 5,000-token system prompt at 1 million calls/month = 5 billion tokens. At GPT-5.4 pricing ($2.50/M): $12,500/month just for the system prompt. Compressing it to 2,000 tokens saves $7,500/month with zero change to output quality if done carefully. The gains compound: caching a shorter prompt also gets cheaper.
FAQ
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Last verified: 2026-08-20 · methodology · data sources