How to use it· 4 steps
- Drop the PDF you want to change into the box above. It opens in the page; nothing is uploaded.
- Choose Edit text and click the line you want to change — it turns into a text box with the old words selected, ready to retype.
- Use the other tools to add text, a signature, an image, a highlight, a whiteout box, shapes or freehand ink, and drag anything you add to where it belongs.
- Press Save edited PDF, check the preview, and download the result.
Step by step
How to use the edit pdf
- 1Drop the PDF you want to change into the box above. It opens in the page; nothing is uploaded.
- 2Choose Edit text and click the line you want to change — it turns into a text box with the old words selected, ready to retype.
- 3Use the other tools to add text, a signature, an image, a highlight, a whiteout box, shapes or freehand ink, and drag anything you add to where it belongs.
- 4Press Save edited PDF, check the preview, and download the result.
What "editing a PDF" actually involves
A PDF is not a word-processing document. It is closer to a set of printing instructions: place this glyph at these coordinates, in this font, at this size; draw this line; paint this image here. There are no paragraphs and often no spaces, only positioned characters. That is why PDFs look identical on every screen, and also why changing one is harder than changing a Word file — there is no text flow to type into, just a page of things in fixed places.
Editing therefore means two separate operations. Adding is the easy one: new text, images and shapes are drawn on top of the page, exactly as a pen would add them to paper. Changing existing text is the hard one, because the old characters have to go somewhere. Most online editors take a shortcut here: they paint a white rectangle over the old words and type the new ones on top.
This editor does the harder thing. When you change a line, it reads the page's drawing instructions, works out which instructions place the characters of that line, and rewrites them so those characters are no longer drawn at all. Everything else on the line, and on the page, stays exactly where it was. Then the new text is set on the original baseline in the closest matching font.
Why covering text with white is not editing
A white box hides text from the eye and from nothing else. The original words are still in the file: select across the area and they highlight; press Ctrl+F and the PDF reader finds them; copy and paste, and they come out; open the file in a tool that ignores the box — or simply print it on some printers — and they are back. Search engines and document-management systems index them too.
For a changed price, a corrected date, an updated address or a fixed name, that leaves two versions of the truth in one document, and the hidden one is the old one. In contracts, invoices and applications this is genuinely risky, which is why the editor reports what it did when you save: either that the original words were removed, or — in the rare cases where it could not reach them — that they were covered instead, with the line named, so you are never told something was removed when it was only hidden.
If your goal is to hide confidential information rather than to change wording, use Redact PDF instead. Redaction is designed for the adversarial case — it removes the content under the marked areas from the page entirely, images included — while editing is designed to produce a corrected document that still has selectable text.
How the replacement text is matched
PDFs almost always embed only the characters they actually use — a subset of the font — so the original typeface usually cannot type new words: the letters you need may simply not be in the file. The editor therefore sets replacement text in one of the three standard PDF families, choosing the closest from the embedded font's own name: a serif face such as Times New Roman or Georgia becomes Times; a monospaced face becomes Courier; everything else, which is most body text, becomes Helvetica. Bold and italic are carried over, and the size and colour are taken from the original run.
The colour is sampled from the rendered page rather than guessed, and so is the background behind the line, which matters on forms with tinted fields. You can change any of it in the bar above the page: family, size, bold, italic, alignment and colour. In practice, a single edited line in body text is very hard to spot; a whole rewritten paragraph in a distinctive display face is easier to notice, and for that kind of change the honest answer is to edit the source document and export a new PDF.
Text in scripts the standard fonts cannot draw — Devanagari, Chinese, Arabic and so on — is placed as a sharp image of the text instead, rendered by your browser's own text engine. It looks right and prints well, but it cannot be selected; the save summary tells you when that has happened.
Everything else the editor does
Add text places a new text box wherever you click; drag its right-hand handle to make it wrap at a width. Whiteout covers an area with the page colour. Highlight follows the lines of text you drag across, the way a highlighter pen does, and is saved with a multiply blend so the text underneath stays crisp. Rectangle, ellipse, line and arrow are the usual markup shapes; hold Shift while drawing a line to snap it to 45 degrees. Draw is a freehand pen for mouse, stylus or finger.
Image places a PNG or JPEG — a logo, a stamp, a photo of a receipt — and keeps its proportions as you resize it. Sign opens a pad where you draw or type a signature and places it as an image. Every object can be selected, moved, resized, restyled, duplicated with Ctrl+D or deleted, and the whole session has undo and redo.
Keyboard users can do all of this without a pointer: every tool has a single-key shortcut, arrow keys nudge the selected object, and in Edit text mode the list under the page shows every line of text on the current page as a button that opens it for editing.
Limits worth knowing before you start
Scanned documents are pictures of pages, with no text in them to edit. The editor will still let you add text, white out and sign, but to change the existing words of a scan, run it through OCR first so it has a text layer. Password-protected PDFs need their protection removed first; the Unlock PDF tool does that when you know the password. Fillable forms are best completed with Fill PDF Form, which writes into the form's own fields.
Text is edited a line at a time, and a replacement does not reflow the rest of the paragraph: if your new wording is much longer than the old, it will run past the end of the line. Very occasionally, text sits inside an embedded drawing — a logo or a chart pasted into the page — where it cannot be rewritten; it is covered instead, and the summary says so. Editing also invalidates any existing digital signature on the file, as any change does by design.
There is no account, no daily limit, no watermark and no upload. Large documents open page by page as you scroll, so a 300-page PDF is practical on an ordinary laptop.
Answers
Frequently asked questions
Is my PDF uploaded to edit it?
No. The file is opened by your browser, every change is made on your device, and the edited PDF is created there too. You can disconnect from the internet after the page loads and the editor keeps working.
Can I edit the existing text, or only add new text?
Both. Choose Edit text and click any line: it becomes an editable box. When you save, the original characters are removed from the page and your new text is set on the same baseline.
Will the edited text match the original font?
As closely as the file allows. PDFs usually embed only the letters they use, so replacements are set in the nearest standard PDF family — Helvetica, Times or Courier — in the original size, weight, style and colour. You can adjust any of these.
Does whiteout remove the text underneath?
No — whiteout only covers it, and the text remains in the file. To change wording, use Edit text, which removes the original characters. To remove confidential information for good, use Redact PDF.
Can I edit a scanned PDF?
You can add text, images, signatures and highlights to a scan. To change its existing words, convert it with OCR first so the text exists as text rather than as part of a picture.
Is there a page or file-size limit?
There is no artificial limit. Pages render as you scroll, so long documents are fine; extremely large files are bounded only by your device's memory.
Can I undo a change?
Yes — Ctrl+Z undoes and Ctrl+Shift+Z redoes, or use the arrow buttons in the toolbar. Nothing is written to the PDF until you press Save.