Is my data really private?

Yes. All substitution runs in your browser tab. No data is sent to any server. Session history lives only in localStorage. Shareable URLs encode your data as a base64 string in the URL — no server stores it. Verify by opening your browser's Network tab (F12 → Network) and observing zero outbound requests when you click "Process All".

How does batch pagination work?

Set a batch size (10, 25, 50, 100, 250, or 500) using the Batch Size control above the Process button. "Process All" runs the first batch starting from row 1. A "Process Next N" button then appears — click it to advance through the dataset in controlled chunks. This is useful for spot-checking results before committing to a full large-dataset run.

How do I save a custom template?

Click the "Save" button next to the template editor header. Give your template a name and optional description, then click "Save Template". Your custom templates appear in the Template Library under the "My Templates" tab. They are stored in your browser's localStorage and persist across sessions. You can edit or delete them at any time.

Diff view shows a side-by-side comparison of the original template (left) and the substituted result (right). {{variable}} placeholders are highlighted in amber on both sides — the left shows the placeholder name, the right shows the substituted value. This makes it easy to audit substitution accuracy at a glance, especially for multi-variable CSV templates.

How does multi-column CSV substitution work?

Upload or paste a CSV where the first row contains column headers (e.g., product_name, category, price). The tool automatically maps each {{column_name}} placeholder in your template to the corresponding column value for each row. Column names are case-insensitive and spaces are converted to underscores.

How accurate is the token estimator?

The estimator uses the ~4 characters per token heuristic, accurate to within 10–15% for standard English text. For non-English content, code, or heavily punctuated text, actual token counts may differ. For precise counts, use the tokenizer provided by your target model's API.

Legal

Terms of Service

Effective date: May 1, 2025

Plain-language summary: PromptProcessor.com is a free browser-based tool. All processing happens locally on your device. We do not collect, store, or transmit your prompts or data. By using the tool, you agree to these terms. If you disagree with any part, please stop using the service.

1. Acceptance of Terms

By accessing or using PromptProcessor.com (the "Service"), you agree to be bound by these Terms of Service ("Terms"). These Terms apply to all visitors and users of the Service. If you are using the Service on behalf of an organization, you represent that you have the authority to bind that organization to these Terms.

We reserve the right to update these Terms at any time. Changes will be posted on this page with an updated effective date. Continued use of the Service after changes are posted constitutes acceptance of the revised Terms.

2. Description of Service

PromptProcessor.com provides a browser-based batch prompt processing tool that allows users to apply a prompt template to a list of variable inputs. The core processing functionality runs entirely within the user's web browser. No prompt templates, variable data, or processing results are transmitted to or stored on our servers during normal tool operation.

The Service may include optional features that involve server-side processing, such as the contact form, waitlist registration, and (when available) the Pro tier. These features are clearly identified and governed by the privacy practices described in our Privacy Policy.

3. Use of the Service

You agree to use the Service only for lawful purposes and in a manner that does not infringe the rights of others. Specifically, you agree not to:

Use the Service to generate content that is illegal, harmful, threatening, abusive, harassing, defamatory, or otherwise objectionable
Attempt to interfere with, compromise the integrity of, or gain unauthorized access to the Service or its underlying infrastructure
Use automated means to scrape, crawl, or otherwise extract data from the Service beyond normal browser usage
Reproduce, duplicate, copy, sell, or exploit any portion of the Service without express written permission
Use the Service in any way that could damage, disable, overburden, or impair it

We reserve the right to terminate or restrict access to the Service for any user who violates these Terms, at our sole discretion and without prior notice.

4. Intellectual Property

The Service, including its design, code, text, graphics, and other content, is owned by or licensed to PromptProcessor.com and is protected by applicable intellectual property laws. You are granted a limited, non-exclusive, non-transferable license to use the Service for its intended purpose.

You retain full ownership of any prompt templates, variable data, or outputs you create using the Service. We claim no rights over your content. Because the core tool processes data locally in your browser, your content is never transmitted to us during normal operation.

The built-in prompt template library is provided for your use within the Service. You may use these templates as the basis for your own work, but you may not redistribute them as a standalone product or claim authorship of the template designs.

5. Disclaimer of Warranties

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.

We do not warrant that the Service will be uninterrupted, error-free, or free of viruses or other harmful components. We do not warrant the accuracy, completeness, or usefulness of any information provided through the Service.

The token estimator and prompt quality scorer are provided as approximate guidance tools only. Their outputs are estimates based on heuristics and should not be relied upon as precise measurements for production systems.

6. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, PROMPTPROCESSOR.COM SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, DATA, GOODWILL, OR OTHER INTANGIBLE LOSSES, RESULTING FROM YOUR USE OF OR INABILITY TO USE THE SERVICE.

IN NO EVENT SHALL OUR TOTAL LIABILITY TO YOU FOR ALL CLAIMS ARISING FROM OR RELATED TO THE SERVICE EXCEED THE AMOUNT YOU HAVE PAID US IN THE TWELVE MONTHS PRECEDING THE CLAIM, OR ONE HUNDRED DOLLARS (USD $100), WHICHEVER IS GREATER.

7. Third-Party Services

The Real AI Runner feature allows users to connect their own API keys from third-party AI providers (such as OpenAI or Anthropic). When using this feature, requests are sent directly from your browser to the respective third-party API. We are not a party to those transactions and are not responsible for the practices, policies, or content of third-party services.

Your use of third-party services is governed by their respective terms of service and privacy policies. We encourage you to review those documents before using the Real AI Runner feature.

8. Governing Law

These Terms shall be governed by and construed in accordance with applicable law, without regard to conflict of law principles. Any disputes arising under these Terms shall be resolved through good-faith negotiation in the first instance. If negotiation fails, disputes shall be subject to binding arbitration in accordance with applicable rules.

9. Contact

If you have questions about these Terms, please contact us through the Contact page. We will respond within a reasonable time.