Free AI prompt library: 15 starter templates
Most "free" prompt libraries are lead magnets. This one is the real thing — 15 templates you can use today without signing up for anything.
Searching for a free AI prompt library usually lands you on a signup wall, a Notion page selling a $29 upgrade, or a ChatGPT marketplace that needs a credit card. This post is neither. Below are 15 genuinely free, ready-to-use, parameterized prompt templates covering the most common daily AI tasks. Copy, paste, use.
What counts as "free" here
Free as in: no signup, no email capture, no premium tier, no login. You can copy these templates, paste them into any AI service, and use them forever. They are also the default starter set bundled with TextDeck — an also-free app that makes them hotkey-accessible.
1. Summarize anything
Template: "Summarize the following in {{length}} sentences. Preserve key facts. Skip fluff. {{content}}"
2. Explain to an expert in an adjacent field
Template: "Explain {{concept}} to someone with expertise in {{adjacent_field}} but no background in {{target_field}}. Use an analogy they would recognize. Max 200 words."
3. Turn messy notes into structured output
Template: "Convert these messy notes into {{format}} with these fields: {{fields}}. If a field is missing, mark as null. Do not invent. {{notes}}"
4. Draft an email
Template: "Draft a {{tone}} email from {{sender_role}} to {{recipient_role}}. Purpose: {{purpose}}. Include one specific detail that shows context. Max {{length}} words."
5. Critical review
Template: "Review the following {{content_type}} critically. Identify weak claims, unsupported assertions, logic gaps. Be direct. Do not soften. {{content}}"
6. Brainstorm with constraints
Template: "Brainstorm {{count}} approaches to {{problem}}. Constraints: {{constraints}}. Rank from most to least feasible. Include one that is unconventional."
7. Compare options
Template: "Compare {{options}} across these dimensions: {{dimensions}}. Output a markdown table. Flag any dimension where the answer depends on context."
8. Meeting prep
Template: "I have a meeting with {{person_or_company}} about {{topic}}. Goal: {{goal}}. Give me: 5 questions to ask, 3 points to make, 2 things I should not bring up."
9. Learning plan
Template: "Build a {{duration}} learning plan for {{topic}}. I have {{hours_per_week}} hours per week. Current level: {{current_level}}. Output: weekly milestones, resources, one checkpoint per week."
10. Decision framework
Template: "I am deciding between {{options}} for {{context}}. Criteria I care about: {{criteria}}. Walk me through a structured decision. End with a recommendation."
11. Persona-based rewrite
Template: "Rewrite the following in the voice of {{reference_style}}. Preserve meaning. Do not add information. {{original}}"
12. Extract structured data
Template: "Extract the following fields as JSON from the text: {{fields}}. Use null for missing fields. Do not invent. {{text}}"
13. Step-by-step plan
Template: "Help me plan {{goal}}. Step 1: constraints. Step 2: assumptions. Step 3: three approaches with tradeoffs. Step 4: recommendation with reasoning. Context: {{context}}."
14. Uncomfortable questions
Template: "I am considering {{decision}}. Give me the 10 most uncomfortable questions someone skeptical of this decision would ask. No softballs."
15. Code review
Template: "Review the following code for {{concern}}. Focus on correctness, edge cases, readability. Flag any hidden state or non-obvious control flow. {{code}}"
How to make this a library
Copy these into any prompt manager. If you want the hotkey-from-anywhere experience, drop them into TextDeck — free, no account — and they become one keystroke away on macOS and iOS. Variables use the {{double-brace}} format; the app knows how to fill them in.