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What can this PDF editor do, and what can it not do?

It adds new content on top of existing pages, and it cannot retype, reflow or delete the text that is already inside the PDF. That covers the small changes most people need without buying software: adding a missing address, completing a form that has no fields, stamping a logo on a letter, correcting a date with white-out or marking up a draft for a colleague. The tools below work the same with a mouse, a trackpad or a finger.

• Text boxes with size from 6 to 96 pt, color and bold, including multi-line paragraphs that wrap to the box width.
• Images such as logos, stamps or photos, placed and scaled with their proportions kept.
• Rectangles, circles, lines and arrows for diagrams and callouts, filled or outlined.
• A translucent highlighter in five colors and a smoothed freehand pen for review notes.
• White-out boxes to hide outdated text before typing a correction.

How do I change the existing wording in a PDF?

Convert the file with PDF to Word, edit the wording in a word processor, then export the result with Word to PDF. A PDF stores text as individually positioned glyphs rather than paragraphs, so there is nothing to reflow when a sentence gets longer. The conversion rebuilds paragraphs so that Word, Pages or LibreOffice can handle line breaks and pagination for you.

For a single word, number or date, the faster route stays inside this editor. Draw a White-out box slightly larger than the old text, add a text box on top, and match the size and color with the text controls. The result looks right on screen and in print, but the old text remains underneath, so never use this method to hide confidential information.

How does the editor write changes into the file?

Each page is rendered as a background picture with pdf.js, your additions float on a layer above it, and nothing touches the original until you press Save PDF. At that point every object is converted to real PDF drawing commands in page coordinates, taking page rotation and the crop box into account, so a text box placed on a sideways scan lands exactly where you saw it.

Text is written with a standard PDF font and stays selectable and searchable in the saved file. Shapes and pen strokes become vector paths, so they print crisply at any zoom level. Images are embedded as PNG with transparency, and highlights use a multiply blend, as defined for PDF transparency in ISO 32000-2, so the text underneath stays readable.

How do I make edits look like part of the original document?

Zoom in before placing anything, match the text size and color to the surrounding lines, and nudge items into position with the arrow keys. Zoom goes up to 300 percent, which makes it far easier to line a text box up with a printed baseline or a form underline. A few more habits help the additions blend in with the page.

• To replace a word, draw white-out slightly larger than the old text, then add the new text on top.
• Use the arrow keys to nudge a selected item one point at a time; hold Shift for ten-point steps.
• Undo and redo cover every move, resize and style change, so experiment freely.
• White-out is always pure white, so on yellowed scans keep the box as small as the old text allows.
• Changes are lost if you close the tab before saving, so save when you finish each document.

When should I use a different tool instead?

Use a different tool whenever the job is signing, filling interactive fields, rearranging pages or removing information for good. Sign PDF has a signature pad with initials and date stamps, Fill PDF Form writes answers into real form fields, Organize PDF reorders and deletes pages, and Redact PDF removes the content under a box instead of covering it. After editing, Flatten PDF is not needed, because saved edits are already ordinary page content.