Annotate PDF - Add Text, Highlights & Stamps Online Free

Upload your PDF and use the toolbar to highlight text, underline passages, add sticky notes, draw freehand, insert text boxes, stamps and arrows. Everything renders directly in your browser — no Adobe Acrobat licence, no desktop install — and your annotated PDF stays a real PDF that opens cleanly in Preview, Acrobat Reader and Foxit.

Yes. Annotations are saved using the standard PDF annotation layer, so reviewers, lawyers and clients see the exact same highlights and comments in Acrobat Reader, macOS Preview and every modern browser. They are not flattened images either — recipients can hide them, reply to them or remove them with their own PDF tool.

Yes. Drop a signature image, type a stylised signature or use the draw tool to ink your name with a mouse or touch device. Add Approved, Confidential and Draft stamps for fast contract markup, and place initials in the margins where your counterparty expects them.

Toggle the "Flatten on download" option before saving and every highlight, comment and signature is baked into the page bitmap. Flattened PDFs are perfect for final delivery — recipients can read them but cannot accidentally move or delete your notes.

Partly. Placing and editing annotations happens live in your browser, but exporting sends your PDF to our secure server over HTTPS to bake the annotations into the file — it is auto-deleted immediately after processing, and we never store, share, or sell it. If your workflow requires the file to never leave your device, use a desktop PDF editor instead.

Yes. Navigate every page in the side panel, annotate scanned reports, and add searchable text boxes on top of image-only PDFs. Scanned PDFs keep their original layout while your annotations sit on a transparent overlay so the underlying scan stays sharp.

Pick the Text tool, type your note and choose a colour and size, then click the exact spot on the page to drop it (or tap 'Add to page'). Drag it to reposition, or tap it to edit later. The note is written into the PDF as real, selectable text, so it stays crisp and searchable in the download.

Yes. Switch to the Highlight tool, pick a highlighter colour (yellow, green, blue, pink and more presets, or any custom colour), then drag a translucent band across the text. Add as many highlights as you like and resize each one — handy for flagging clauses in a contract or key passages in a paper.

This tool layers your own text and highlights on top of the page; it doesn't rewrite the document's existing words. To edit the original content, use the PDF Editor tool, which lets you modify the text and elements already in the file.

The Stamp tool includes seven ready-made presets — APPROVED, CONFIDENTIAL, DRAFT, REVIEWED, PAID, URGENT and VOID — or you can type your own custom stamp text in the field below the presets. Pick any color for the stamp, click a spot on the page to place it, and it renders as a bold, bordered label baked into the exported PDF.

Select the annotation, then drag its corner handle to resize it — text and stamps scale their font size, while highlights stretch their width and height. On a touchscreen you can also pinch with two fingers directly on the annotation to scale it up or down.

Highlight the clauses that need attention using a bright preset color, add Text notes with your comments next to each one, then drop an APPROVED or REVIEWED stamp near the signature line before exporting. Combining all three tools on the same page gives reviewers a clear, at-a-glance markup.

Yes — the Pages panel shows an Annotations list with every text note, highlight and stamp you've placed, labelled by type and page number. Tap any entry to jump straight to that page with the annotation selected, which is handy once a long document has dozens of highlights and comments scattered across many pages.

Yes — select any text note, highlight or stamp on the page, then press Delete or Backspace to remove it instantly instead of reaching for the trash-can icon. This only works when an annotation is selected and you're not typing in a text field, so it won't accidentally delete something while you're editing a note.

A placed stamp's text can't be edited directly — the Edit selected panel only lets you change its color once it's on the page. To fix the wording, delete the stamp with the trash icon or Delete key, then pick the correct preset or type new custom text in the Stamp panel before adding it to the page again.