No doubt that PDF is a popular file format to exchange all kinds of documents like presentations, invoices and etc. Because PDF files have smaller size comparing with these source files and can retain the original layout of source files. Besides, you can't print, copy or edit as you like without permission. You can easily find many free and commercial PDF editing softwares that allows you to modify like adding comments to PDF files. You can annotate certain areas of the PDF files you want to talk about something. You can also add comments to contents that other people feel difficult to understand. Here we guide you add comments to PDF files with some powerful and free PDF editing tools.
Annotate PDF Files with SKim
Skim is a free Mac PDF viewer and annotation software. It enables you to search PDF files, bookmark them, add notes, highlight and underline sections on them, and take "snapshot". In addition, Skim can open PostScript files. You can use SKim to read and present PDF files with full screen mode. You can add notes to PDF files with it. But only readers using SKim can see your notes. It has various annotation features like highlighting, text writing, adding circles, rectangles, and arrows, etc. You can follow the steps below to add text notes to your PDF files.
Step 1: Choose Tools > Text Tool.
Step 2: Choose Notes > Text Note.
Step 3: Drag the note in the document to the place you like. To enter text, double-click the note.
Add Annotation to PDF with Preview
Preview is a Mac's application to display PDF documents and images. Preview supplies a number of PDF editing and reading features. You can zoom in or out, bookmark pages, add notes or highlighting, copy text, fill out forms, and more. It's a very useful tool for Mac users. You can annotate PDF files with the guide below.
Step 1: Drag the PDF file's icon to the Preview icon in your Dock.
Step 2: Click the Annotate button on the toolbar.
Step 3: You can see some annotation buttons below the toolbar in the Preview window, including arrow, oval, rectangle, text, note, link, signature, highlight, strikethrough, underline, color Menu, line width menu, font panel, and annotations list.
Add Comments to PDF Files Using PDFEscape
PDFEscape is a free online PDF reader, editor, form filler and form designer. It's a versatile tool with many features. This tool allows you to create new PDF forms, annotate, share, edit, save, print and view PDF files online. So you can add text, images, links, form fields, lines, arrows, rectangles, circles, and checkmarks to certain areas of your PDF files. It can be a very useful tool for some advanced annotations and filling out forms.
Tips: If you want to have a PDF editor with powerful functions, you can try the PDF Editor Pro for Mac. It supports OCR and can edit scanned PDF files easily. You can add and modify text and images in PDF files. Besides, you are also allowed to annotate with a sticky note and text box to share comments, convert PDF files. It's the best tool to edit PDF files.