Whose name appears on my comments?

Every comment in the downloaded file, including the ones it already had, lists Comment (loopdf.com) as its author, with the date and time you downloaded it. There is no setting for your own name.

Can a comment run over several lines?

Yes. Press Enter for a new line and the note keeps your line breaks. Enter together with Ctrl, Cmd or Shift saves the comment instead.

Can I move a comment after placing it?

Not by dragging it. Delete the note, then click the new spot and add it there again. When you reopen a note its text is already selected, so you can copy it before deleting and paste it into the new one.

Can I highlight or underline text?

No. Comment PDF adds sticky-note comments only; it has no highlighter or text markup. To point at a passage, place a note right beside it and quote the words in the comment.

Does it work on scanned documents?

Yes. A note is pinned to a position on the page, not to a word, so a scanned page takes comments like any other. There is no need to run OCR first.

Can I comment on a password-protected PDF?

Not while the password is on it, because the file can't be opened here. Remove it first with Remove Password, add your comments, then lock the file again with Protect PDF if you need to.

Will the comments show when I print?

Usually not. The notes are not marked for printing, so most PDF readers leave them off the paper and print the page as it is. If you need them on paper, print the comment list from your PDF reader, or write on the page itself with Edit PDF.

Can I undo a deleted comment?

No. Delete and Clear All both ask you to confirm first, and there is no undo afterwards. If you clear notes by mistake before downloading, open the original file again to get back the comments it came with.

Comment PDF

Add comments and annotations to your PDF documents. Click on the PDF to add sticky notes and comments. Your files are processed in your browser - nothing is uploaded to any server.

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Click 'Open PDF' to load a document and start adding comments

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Tip: Click anywhere on the PDF to add a comment. Type your comment in the popup that appears.

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Comment PDF Online in Your Browser

The comment PDF tool places sticky-note-style markers at exact coordinates on a page. When you click a spot in the document, the editor stores that position and the text you type, then writes both into the file as a standard PDF annotation. Any reader that opens the result will show the same notes in the same places.

Everything runs inside your browser. The file is read into memory on your own machine, marked up, and rebuilt there. Nothing is sent to a server, so the document never leaves your device.

How Annotations Are Written To Your File

Each comment you add becomes an embedded annotation object attached to a page. The tool records the page number, the point where you clicked, and the note text. On download, those objects are merged back into the original PDF structure without flattening or rasterizing the page content.

Because the notes are saved as native PDF annotations rather than baked-in pixels, they stay editable in other software and can be hidden or printed depending on the reader settings. Here is what the tool handles when you annotate a PDF:

Placed comment markers tied to a fixed spot on the page
Hover tooltips that preview the note text without opening the panel
Multi-page navigation so you can add notes across the whole document
Editing and deleting individual notes, or clearing them all at once

How To Add Notes To PDF Files

The flow starts the moment you upload a file. The full-page editor renders your document and switches into click-to-comment mode, so a single click drops a marker and opens the writing panel.

Open the Comment PDF tool page and upload a single .pdf file. The editor loads your document.
Click any location on the page to place a comment marker.
The comment panel opens with a four-row textarea. Type your note.
Click "Save Comment", or press Ctrl/Cmd+Enter or Shift+Enter.
The note appears as a sticky note. Hover over it to see the tooltip preview.
Move through the file with the Previous and Next buttons to annotate other pages.
Click "Download" to save the PDF with the comments embedded.

To change a note, click it and edit the text in the panel, then save or use Cancel to discard the change. Delete removes one note; "Clear All" removes every note in the document.

When To Use The Comment PDF Tool

Sticky-note annotations suit feedback and review work where you need to point at a specific line, figure, or paragraph. The marker holds a position, so the reader knows exactly what your remark refers to.

Reviewing a contract or proposal and flagging clauses for the author
Marking up a design proof or report with page-specific notes
Leaving questions for a colleague on a shared draft
Recording reminders on invoices, forms, or statements before filing them

If you need to change the underlying text or images instead of commenting on them, use the edit PDF tool. To compare two versions side by side before you annotate, the compare PDF tool highlights what changed.

How Commenting Differs From Related Tools

Adding notes leaves the original content untouched and layers annotations on top. That is different from redacting, signing, or editing, which each change the file in their own way.

Comment PDF attaches positioned notes as annotations that any reader can view.
Redact PDF permanently removes text and images so they cannot be recovered.
Sign PDF places a signature mark rather than a text note.
Watermark PDF stamps repeating text or an image across pages.

FAQ

It lets you place sticky-note-style comments at specific spots on a PDF page. When you click a location, the tool records that position and the text you type, then writes both into the file as a standard PDF annotation. The notes appear in the same places in any PDF reader that opens the finished document.

Yes. The notes are saved as native PDF annotation objects, not pictures pasted onto the page. Because they follow the standard PDF annotation format, common readers show them as sticky notes at the coordinates you set. Depending on reader settings, viewers can open each note, hide the markers, or include them when printing.

No. The document is read into your browser's memory, marked up, and rebuilt on your own machine. No copy is sent anywhere, so the file never leaves your device. This also means the speed of the work depends on your own computer rather than a network connection or a remote queue.

Click the existing sticky note on the page. The comment panel reopens with the current text loaded into the textarea. Change the wording and save, or press Cancel to drop the change and keep the original text. Every edit stays in your browser until you download, so nothing is committed to the file before then.

Yes. Use the Delete option to remove a single note, or "Clear All" to strip every note from the document at once. Removal happens in the editor before you download, so the annotation objects are simply never written into the final file. Clearing all is useful when you want to start a fresh review pass.

Yes. The editor supports multi-page navigation with Previous and Next buttons. Each note stores the page number it belongs to, so a comment placed on page five stays on page five in the final file. You can move freely between pages and drop markers anywhere you need across the whole document.

Yes. While the comment panel is open with text in the textarea, press Ctrl/Cmd+Enter or Shift+Enter to save the note without reaching for the "Save Comment" button. This keeps your hands on the keyboard when you are adding many notes in a row during a longer review session.

Commenting layers annotation objects on top of the page and leaves the original text and images untouched. The edit PDF tool changes the underlying content itself, replacing or adjusting what is printed on the page. Use comments for feedback that others should read, and use editing when the document content needs to actually change.

A comment adds a note without touching what is on the page, so the content underneath stays fully visible. The redact PDF tool does the opposite: it permanently removes the selected text and images so they cannot be recovered. Use commenting to flag content and redaction to erase it for good.

The tool takes a single .pdf file as input and returns a PDF with the comment annotations embedded. If your source is a Word document, image, or spreadsheet, convert it to PDF first with a tool like word to PDF , then upload the result here to add your notes.

No. The notes are merged into the existing PDF structure without flattening or rasterizing the page. The original text stays as text and images keep their resolution. Only the annotation objects are added, so the document looks the same as before except for the sticky-note markers you placed on it.