Frequently asked questions about User PDF

Features, limits and care for your files

What can I do with User PDF?

Use 38 tools to convert, merge, organize and protect documents, recognize text, summarize, translate, analyze AI signals in images and remove metadata. Each tool shows its availability and limits.

How can I check whether an image was AI generated or edited?

Upload an original JPG, PNG or WebP to Analyze image origin. User PDF combines two local detectors, C2PA credentials and a search for one known invisible watermark. The result explains the evidence and may be inconclusive. Screenshots, cropping and compression can reduce available signals.

Is the detector percentage the certainty that an image is AI generated?

No. A score is a model output, not a validated probability of correctness for that image. Detectors can make both kinds of mistakes. No detected signals does not prove human origin, and a high score does not replace checking the source.

Can I remove AI indicators from image metadata?

Remove image metadata deletes descriptive fields that may include creation software, prompts, authorship and location. It creates a copy and a report of removed and retained fields. This does not erase invisible pixel watermarks or statistical patterns and does not make an image undetectable.

Does metadata cleanup change colors or quality?

Cleanup does not recompress the pixels. The copy is reopened to verify displayed pixels, orientation and color profile. If verification fails, no result is released. The original stays intact; download and review the copy before sharing.

What happens to C2PA credentials?

C2PA credentials record signed information about creation and editing. Cleanup requires confirmation and removes embedded credentials from the copy because editing metadata can invalidate the binding. Keep the original. External records may remain accessible; missing C2PA does not prove authenticity.

Do I need an account? How many free uses do I get?

You can start without logging in. You get 5 uses per IP per day, shared by people on the same IP and reset at midnight in Brasília. Creating an account does not reset the allowance. Analysis and cleanup are separate tools: each completed operation follows the system usage accounting.

What does Premium include?

The current offer costs R$25 for 30 days, with 1,000 uses per account per day. Payment is one-time in Brazilian reais through Mercado Pago, with no automatic renewal. Activation requires provider confirmation. File, processing and tool availability limits still apply.

Are my files public or sent to an external AI?

Files are linked to your session or account and are excluded from the sitemap and public pages. Image analysis and cleanup run on the User PDF server without sending images to external AI providers. Public-edition results normally expire after 60 minutes; download them within the displayed period.

Does PDF to Word preserve everything?

Preserve appearance mode aims to retain the layout and native text in editable blocks. Images and table backgrounds may become a visual layer rather than editable Word cells. Scanned documents may need OCR. Fonts and complex documents require review; absolute fidelity is not guaranteed.

How do I report an error?

Use Report a problem on the tool page. Describe what you expected and what happened. You can attach a screenshot and crop the relevant area before sending it. Review the image to avoid sharing unnecessary personal data. Include the displayed task reference if an operation failed.

Is the system available in English?

Yes. Use the Brazil/US flags at the top to choose Portuguese or American English. English public pages use /en/ on the same domain. Your account is the same; changing the interface language does not automatically translate your documents.