How to Edit a PDF: A Complete Guide

PDFs are designed to look identical everywhere, which is exactly what makes them feel "locked." The good news: with the right tool you can change almost anything in a PDF — the words, the images, the page order, even form fields — without converting it to another format first. This guide walks through the full editing workflow in Falcon PDF, which works the same way on iOS, Android, Mac, Windows and Linux.

What "editing a PDF" really means

"Editing" covers several distinct tasks, and knowing which one you need saves time:

• Content editing — changing the actual text and images baked into the page.
• Annotation — layering highlights, comments and drawings on top without altering the original content.
• Page editing — reordering, rotating, inserting or removing whole pages.
• Form filling — typing into interactive fields and signing.

If you only need to mark up a document, jump straight to annotating a PDF. For everything else, read on.

Open your document

1. Launch Falcon PDF and open the file from your device, cloud storage, or a share sheet.
2. Switch to Editmode from the toolbar. On mobile this is the pencil icon; on desktop it's the Edit tab.
3. The page becomes interactive — clickable text blocks and images are outlined.

Edit text and images

Content editing is where Falcon PDF shines. It detects existing text runs and lets you type directly into them while matching the surrounding font and size.

Change existing text

1. Tap or click the paragraph you want to change.
2. Place your cursor and edit as you would in a word processor.
3. Use the formatting bar to adjust font, size, weight and color. Falcon PDF tries to match the original automatically.

Insert or replace images

• Choose Insert → Image and pick a file to drop it onto the page.
• Drag the handles to resize, or drag the body to reposition.
• Tap an existing image to replace, crop or delete it.

Reorganize, add and delete pages

Open the Pages panel to see thumbnails of every page. From there you can:

Need to split a large file or combine several documents instead? Use the dedicated split and merge tools — or read our guide on merging PDF files.

Fill forms and sign

Interactive forms show clickable fields — just tap and type. For flat forms (no fields), switch to Add Text and place text boxes exactly where you need them, as described in how to add text to a PDF. When you're ready to sign, follow how to sign a PDF securely.

Save, compress and share

1. Tap Save to write your changes back into the PDF.
2. If the file grew after adding images, shrink it with the compress tool — see how to compress without losing quality.
3. Share via email, link or export back to your cloud drive.

FAQ

Can I edit a PDF for free? Yes — Falcon PDF includes core editing on every platform. Download the app to get started.

Will editing break the layout? Falcon PDF edits in place and reflows only the block you touch, so the rest of the page stays put.

Is my document uploaded anywhere? No. Editing happens on your device; your files never leave it unless you choose to share them.