The easiest way to correct text inside a PDF

Why a PDF does not edit like a word-processor file

A PDF holds finished pages, not text that flows. Every letter has a fixed position and font, so changing one line does not push the paragraph below it down. That is why editing a PDF means painting changes onto the page.

Knowing this sets the right expectations. Small corrections such as a date, an amount, a typo or an address come out clean. Rewriting several paragraphs or changing the layout is better done in the program the document was made in.

If only a spot or two needs fixing, this approach is enough. If nearly every page needs rewording, finding the program the document came from is faster and the result looks cleaner.

Step by step: click a paragraph and type the new words

Open the PDF and its pages line up in a single tall column. Choose ‘Edit text’ in the toolbar, then click the paragraph to be changed; an entry box in the same size, weight and color appears right there. Type the new wording and click anywhere outside to apply it.

Each heading and each table cell counts as a separate block, so a change in one leaves the next untouched. When all is done press ‘Save PDF’, then ‘Download’. The new file gets -edited after its name while the original stays as it is.

When you have several corrections, do not save after each one; finish them all and save once. If you spot a mistake along the way, Undo takes you straight back, which makes the work much easier.

• Open the PDF with ‘Choose a file’
• Pick ‘Edit text’ and click the paragraph
• Type the new text and click outside the box
• Press ‘Save PDF’, then ‘Download’

What you can add besides corrected text

If nothing has to be replaced and you just want to put something in, use ‘Add text’. A single line can go anywhere, in regular or bold, between 8 and 48 points, in any of seven colors. ‘Note’ sets the words on a pale yellow patch that looks like a sticky label.

‘Highlight’ marks a line, ‘Pen’ draws freehand, ‘Shapes’ adds boxes and arrows, and ‘Add image’ places a logo or stamp. If you slip, ‘Undo’ steps back through the last 80 changes, and Ctrl+Z and Ctrl+Y (Cmd on a Mac) do the same.

Covering is not deleting

This is where people go wrong most often. ‘Edit text’ lays a patch the color of the page over the old line and draws the new line above it. The page looks different, yet the words under the patch remain in the file and can come back through copying or searching.

For that reason do not rely on it for anything that must stay unreadable, an account number or a national ID for instance. Redact PDF is the right choice there, because it rebuilds the marked pages as flat pictures.

When it does not work, and what to try

Text that runs vertically or at an angle cannot be rewritten in place. A workaround is to cover it with ‘Cover’ and place new words with ‘Add text’, though the font may differ a little. A password-protected file has to go through Unlock PDF before it will open.

A scan holds pictures, not letters, so ‘Edit text’ may be a poor fit. Make it searchable with PDF OCR first, or cover just the area you need and type over it. When a PDF’s fonts hide their characters, the editor reads that line from the page image and marks it for you to verify.

If a paragraph will not respond to a click, the words are probably part of a picture. The simplest fix is to cover that area with ‘Cover’ and type the new words in the same spot with ‘Add text’.

Checks to make after editing

Open the edited file and read the numbers and dates beside the original. A single wrong digit in an amount can cause real trouble, so look twice. If a patch looks slightly off against the background, select it and change its color with the swatch.

Changing a document you did not issue can cause problems of its own. Use this to correct mistakes in your own paperwork, not to alter a contract or certificate that someone else produced.

Before you save

Until you save, your edits exist only on this page, and closing the tab discards them. Processing stays inside the browser with no upload. So that another tool can continue with the same file, a copy of the chosen PDF sits in browser storage for at most two hours, kept on your device alone.

Things to sort out before you start

Jot down what has to change and into what. Write each wrong value beside its replacement and tick them off as you go, and nothing gets missed. Amounts and dates in particular tend to repeat in several places across a document.

Keep the original somewhere safe. Separate folders or a date in the name make it clear later which version is the latest. If the recipient needs to know that a document was corrected, tell them so along with the file.