Are my files uploaded to a server?

No. Every tool on PDFStudio Pro runs completely inside your browser. Your files stay on your device and are never sent to any server.

Is PDFStudio Pro really free?

Yes. All tools are free to use with no daily limits, no account required and no watermarks added to your files.

Does it work on mobile phones?

Yes. The site is built for both mobile and desktop browsers. You can merge, compress and convert PDFs and images directly from your phone.

What browsers are supported?

Modern versions of Chrome, Firefox, Safari, Edge and other Chromium-based browsers work best. JavaScript must be enabled.

Is the site optimized for Google Core Web Vitals?

Yes. Scripts are deferred, CSS is lightweight, layout shift is minimized, and analytics load after the page is interactive for better LCP and INP.

Can I use these tools offline?

Once the page and libraries have loaded, most tools continue to work even if your connection drops, because processing happens locally.

PDFStudio Pro — Free Online PDF, Image & Video Tools

Merge, split, compress, convert, protect and edit PDF files entirely in your browser. Also compress images, apply filters, extract video frames and more. No uploads, no account, no watermarks.

Popular tools

Merge PDF
Split PDF
Compress PDF
Protect PDF
PDF to Word
JPG to PDF
Redact PDF
Compress Image
Compress Video
Compare PDFs
Bates Numbering
Flatten PDF

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Why use Humanize Content on PDFStudio Pro

Humanize Content helps refine AI-generated text into clearer, more natural wording for blogs, emails and documents. Rules run in the browser where possible so drafts stay on your device. Pair it with PDF tools when you need to place polished text into a document or export to PDF. Free to use with no watermark on exported text.

Privacy and tips

Review every suggestion before publishing. Keep originals of important drafts. The site is served over HTTPS. Compatible with modern desktop and mobile browsers.