Help Center
Find answers for PDF Lab tools, privacy, local processing, server processing, advertising, and common file issues. Every tool is free to use and supported by advertising, with no payment or signup required.
What you will find
Each FAQ page focuses on real tool behavior: how the tool works, privacy expectations, troubleshooting, file limits, and when local or server processing is used.
Learn how to add text, images, drawings, comments, and checkboxes to PDF documents online for free.
Find answers about combining multiple PDF files into one document with page selection and reordering.
Get help extracting specific pages from PDF documents and creating new files from selections.
Discover how to reduce PDF file sizes with three compression levels or a target size such as 100 KB.
Learn to rotate PDF pages by 90, 180, or 270 degrees with per-page or batch rotation options.
Get answers about drag-and-drop page reordering, duplication, and deletion in PDF files.
Find out how to add password protection and set permissions for printing, copying, and editing PDFs.
Learn how to remove a known password or print, copy and edit restrictions from a PDF, right in your browser.
Discover how to add electronic signatures, drawings, and signature images to PDF documents.
Get help applying password protection to multiple PDF files simultaneously with batch processing.
Find answers about compressing multiple PDFs and downloading results as a ZIP.
Learn how to cover emails, phone numbers and other details across several PDFs in your browser, and what the boxes do not remove.
Learn how to add customizable page numbers to PDFs with different positions and formats.
Find answers about adding image watermarks with custom opacity, scale, rotation, and positioning.
Learn how to apply the same watermark to many PDFs and download results individually or as a ZIP.
Learn how to convert images and scanned documents to PDF format with camera capture support.
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Local tools keep files in your browser. Server tools upload files only when processing is needed, use temporary storage, and clean up generated files afterward. PDF Lab is supported by advertising and does not require payment, subscriptions, or account registration.
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