AI System Prompt Builder
AI ToolsFill a form, get a structured system prompt
FreePrivateInstant
Who is the AI?
Main goal
Add a file · .txt .md .csv .json … · up to 2.00 MB
Audience
Tone
Reply language
Rules — one per line
Add a file · .txt .md .csv .json … · up to 2.00 MB
Answer format
Section style
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History
All history →AI System Prompt Builder — at a glance
Fill a form, get a structured system prompt.
Your text or values
Run
Instant result
How to use it — step by step
Just your input — nothing to install or sign up for.
1
Add your input
Paste or type into the big box, or press “Try a sample” to see an example.
2
Choose options
Pick the settings you want. The defaults work well for most people.
3
Run the tool
Press the button and the result appears in a moment.
4
Copy the result
Use the Copy button to paste it wherever you need.
Pro tips
Small things that make the result better.
✦Test the prompt with tricky questions before using it live.
✦Keep rules specific — “keep answers under 150 words” beats “be short”.
Quick facts
Freeno signup, no limit
Instantresult in a moment
Privatenothing is uploaded
Any devicephone, tablet or PC
Frequently Asked Questions
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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