How to Edit a PDF Online Free: Add Text, Highlight & Redact
Need to fill in a form nobody made fillable, correct a typo in a contract draft, or black out account numbers before sharing a statement? The free PDF Editor from ZeroFee Tools turns your browser into a lightweight PDF markup studio. It is ideal for job seekers tweaking a resume, landlords filling rental agreements, and anyone handed print-sign-scan PDFs who would rather not own a printer.
How can I edit a PDF for free without Adobe?
Upload your PDF to the free editor and use the markup tools: click anywhere to add text, drag to highlight, draw shapes, or drop in an image. When you are done, download the file and your annotations are flattened into the document permanently. No account, no watermark, no software to install.
Added text uses the editor's fonts, so keep additions minimal on design-sensitive files.
Can I redact sensitive information from a PDF?
Yes. Use the redact tool to black out account numbers, addresses, or personal details before sharing the file. Downloading flattens the redaction into the PDF, so the hidden content cannot be selected or recovered from the exported file. This makes it safe for sharing statements and contracts.
For scanned PDFs, annotate freely but pair with OCR first if you need the underlying text.
Upload a file and you get a toolbar of annotation tools that work on any page: select, text, highlight, shapes, image insertion, and redaction. When you are done, one click bakes everything into a new PDF. Nothing is uploaded - your document never leaves your device.
How to edit a PDF step by step
- Open your PDF by dropping it onto the page or clicking to browse. It renders right in the browser, page by page.
- Add text with the Text tool: click anywhere on the page, type, then adjust the size with the Text size control (it defaults to 18px). Drag the box to position it precisely over a form field.
- Highlight key lines using the Highlight tool - drag across text the way you would with a marker. Perfect for flagging clauses for a colleague.
- Draw attention with shapes: Box and Ellipse outline areas of a page, handy for circling totals on an invoice or marking up a floor plan.
- Insert an image with the Image tool - drop in a scanned signature, a company logo, or a stamp, then resize and place it.
- Redact sensitive data with the Redact tool: paint solid black boxes over account numbers or addresses. Unlike just covering text with a box in some editors, redaction here is meant to truly hide the content in the exported file.
- Selected something by mistake? Hit Delete selected. When the page looks right, click Download edited PDF to save the flattened result.
5 practical tips
- Redact before you share, not after. Always apply redaction to a copy, verify the black boxes cover everything in the downloaded file, then send - never send first and fix later.
- Match the font size to the document. Body text in most PDFs is 10–12pt; the default 18px text can look oversized on dense pages, so size down for a natural fit.
- Zoom in for precise placement. Form fields and signature lines are small - working zoomed in keeps your added text aligned instead of floating.
- Use highlight sparingly. A page where everything is highlighted highlights nothing. Mark only the lines your reader must not miss.
- Keep a clean original. Download the edited version under a new filename so you can re-edit from scratch if the other party requests changes.
FAQs
Are my edits permanent?
Yes - downloading flattens your annotations into the PDF, so text, highlights, and redactions become part of the file and display correctly in any PDF reader.
Can I edit scanned PDFs?
You can annotate them (add text, highlight areas, redact), but the original scanned text itself is an image, so it cannot be retyped like a digital PDF. Pair it with an OCR tool first if you need the underlying text.
Will added text match the document's font?
Added text uses the editor's standard fonts rather than the PDF's embedded ones. For form-filling this is rarely noticeable; for design-sensitive documents, keep additions minimal.