A landlord emails a rental agreement and asks you to sign page four and initial every page. A bank sends a form that is a PDF but has no fields to type into. A colleague wants comments on a report. None of these jobs needs paid software, an account or uploading a private document to someone else's server. They need a PDF editor that runs in your browser and an understanding of what a PDF editor can and cannot do.
This guide covers the everyday edits, the tools for each, and the cases where a different tool is the right answer.
Why PDFs are awkward to edit
A PDF is designed to look the same everywhere, not to be rewritten. Inside, each line of text is usually stored as positioned fragments, sometimes split mid-word, with fonts that may only include the characters used. That is why "just changing a word" in a PDF is hard, and why most editors, including ours, work by adding things on top of the page: text boxes, images, signatures, shapes and highlights. For everyday paperwork that is exactly what you need.
When you need to rewrite whole paragraphs, convert the PDF to an editable document first; our guide on converting PDF to Word without losing formatting explains how.
What you can do with a free browser editor
The Edit PDF tool opens your document in a full editor that runs entirely in your browser. The file is never uploaded. You can:
- Add text anywhere, with your choice of font, size and colour, to fill in forms that have no fields.
- Insert images, such as a logo, a stamp or a passport photo.
- Sign: draw or type a signature, then place and resize it.
- Annotate with highlights, freehand drawing, rectangles, ellipses, lines and arrows.
- Tick boxes with checkmarks for declarations and options.
- Cover content with a white-out block and type over it.
- Fix pages: rotate, duplicate, delete or add blank pages from the sidebar.
- Search the document's text to jump to a word.
Every object can be moved, resized, layered, copied and duplicated, and every change can be undone until you download.
Fill in a form that has no fields
- Open the PDF in Edit PDF. No PDF to hand? Use the sample agreement to try it.
- Choose the Text tool (T) and click where the answer goes. Type, then adjust the font size so it fits the line.
- Use checkmarks (C) for tick boxes rather than typing an X, so they line up neatly.
- Zoom in to place text precisely on lines, then drag a selected box into its final position.
- Duplicate a styled text box (Ctrl+D) for the next field so every answer looks the same.
Tip: forms often repeat details such as your name and date on every page. Copy a filled text box (Ctrl+C), go to the next page and paste (Ctrl+V).
Sign a PDF properly
Choose Signature, then draw it with a mouse, trackpad or finger, or type your name and pick a handwriting style. Place it on the signature line and resize it so it looks natural, roughly the height of two lines of text.
A few things worth knowing:
- An image of a signature is an electronic signature in the everyday sense, widely accepted for rental agreements, offer letters and internal forms. Some documents, such as certain government filings, legal deeds or financial agreements, require a certified digital signature or a wet signature. When in doubt, ask the person who sent the document.
- Initial every page by placing a smaller copy of your signature or typed initials on each page.
- Add the date with a text box next to the signature.
If you came looking for a signing tool, Sign PDF opens this same editor, so everything above applies.
Highlight, comment and review
For reviewing reports, contracts and study notes, combine highlights with shapes and text. Highlight a clause, draw an arrow to the margin and add a short text note. Use a consistent colour for each kind of comment (yellow for questions, green for approvals) so the reader can scan quickly. Rectangles are good for drawing attention to a table or figure without covering it.
Rotate, add and delete pages
Scanned documents often come in sideways, with blank pages or in the wrong order. Open the page sidebar to:
- Rotate a page left or right.
- Delete a blank or unwanted page.
- Duplicate a page, for example to fill in two copies of a form.
- Add a blank page for notes or an extra signature page.
For bigger reorganising jobs, such as combining several documents or extracting a range of pages, our guide on organising PDF pages with merge, split and rotate covers the dedicated tools.
White-out versus redaction: an important difference
The white-out tool places an opaque box over content so you can type something new on top. It changes what you see, not what is in the file. The original text is still there underneath and can be copied, searched or recovered.
That is fine for correcting a typo on a form. It is not fine for hiding an account number, an address or a medical detail before sharing. For that, use Redact PDF, which removes the text from the file permanently. Our guide on how to redact a PDF properly explains why so many "redacted" documents leak.
When the PDF will not open
Password-protected PDF. The editor tells you the file is locked and offers Unlock PDF. If you know the password, unlocking removes it so you can edit; see how to remove a password from a PDF.
Damaged PDF. If the file cannot be read, the editor offers Repair PDF, which can often rebuild a broken file.
Very large PDF. Everything runs on your device, so very large files depend on your computer's memory. Most documents open without trouble.
Save, share and keep it safe
Your edits live in your browser until you click Save & Download, which writes a new PDF. If you try to close the editor with unsaved changes, it asks first.
After saving, two finishing steps are common:
- Shrink it for email. Signed scans can be large; Compress PDF reduces the size for email and upload limits.
- Protect it. If the document contains personal details, add a password before sending.
- Combine documents. Some applications want one file; Merge PDF joins the signed agreement with ID copies or annexures.
Frequently asked questions
Is my PDF uploaded?
No. The editor runs in your browser and the file stays on your device.
Can I change the existing words?
Not in place. Cover the old text with white-out and type the new text on top, or convert the PDF to Word for heavy editing.
Will the signature be accepted?
For most everyday documents, yes. For legal or government documents that require a certified digital signature, check with the recipient.
Can I edit on my phone?
Yes. The editor works in mobile browsers, with pinch to zoom and a thumbnail drawer.
Does it add a watermark?
No.
Most PDF jobs are additions, not rewrites: a few answers, a signature, a highlight, a rotated page. A browser editor handles all of them without uploading anything. Open Edit PDF, try the sample agreement, and keep Redact and Unlock in mind for the two jobs an editor should not do on its own.
