Question 1

Are PDF AI Tools really free?

Accepted Answer

Yes — every browser-based tool (compress, merge, split, convert, edit, sign, watermark, OCR) is 100% free with no signup, no watermark, and no daily limits. AI tools (summarize, chat, flashcards) are free with a generous daily quota.

Question 2

Do I need to create an account?

Accepted Answer

No. The vast majority of tools work instantly with no signup. An optional free account lets you save documents, sync across devices, and get higher AI quotas — but is never required.

Question 3

Are my files uploaded to a server?

Accepted Answer

Most PDF tools (compress, merge, split, edit, sign, watermark, rotate, etc.) run entirely in your browser — your files never leave your device. AI tools that need cloud LLMs (chat, summarize) process the document text in memory and auto-delete after.

Question 4

What file formats are supported?

Accepted Answer

PDF, DOCX, XLSX, PPTX, TXT, CSV, Markdown, HTML, and common image formats (JPG, PNG, WEBP, HEIC, TIFF, BMP). The 250+ tools cover edit, convert, merge, split, sign, OCR, AI summarize, AI chat, and more.

Question 5

Is PDF AI Tools faster than ChatPDF or Smallpdf?

Accepted Answer

Yes for most operations. Browser-based PDF tools (compress, merge, split, edit) finish in 1–3 seconds since there's no upload step. AI Chat returns the first answer in under a second on the fast tier — comparable to ChatPDF and faster than Adobe Acrobat AI on most documents.

Question 6

Do you keep my documents or train AI on them?

Accepted Answer

No. Documents are processed in memory only — never stored, never used to train AI models. The robots.txt explicitly opts out of AI training crawlers. For legal or medical documents needing stricter guarantees, browser-based tools never transmit the file at all.

Clinical Trial Protocol Analyzer

How it works

Why this beats a generic LLM