PDF was designed as a final format: a precise record of how pages should look, not a document meant to be rewritten. That is why editing a PDF feels different from editing a Word file. You can change a lot, but text does not reflow like a word processor, and fonts do not always cooperate.
Edit PDF in TokPDF has two modes for two kinds of job. Direct Content Edit changes what is actually on the page: text, images and shapes. Classic Annotator adds a layer on top: highlights, comments, shapes and drawings. Both run in your browser, so the document is not uploaded.
Pick the right mode before you add the file
The mode switch sits above the upload area, so choose before you drop your file in. As a rule of thumb: if the person receiving the file should see corrected content as if it had always been there, use Direct Content Edit. If they should see your remarks about the content, use Classic Annotator.
- Direct Content Edit: fix a typo, update a price or date, replace a logo, add a paragraph, find and replace a name throughout.
- Classic Annotator: highlight passages, underline or strike out text, add sticky notes, arrows, boxes and freehand drawings when reviewing or marking up.
Edit existing text and images
Direct Content Edit uses a PDF engine compiled to WebAssembly, the same family of technology used inside desktop PDF software, running entirely in the browser tab.
Choose Direct Content Edit, then add your PDF. If it is password-protected you will be asked for the password.
Click Edit All to make existing content editable. You can narrow the scope to text, images or shapes if the page is crowded and you keep selecting the wrong thing.
Click into a text block and type. Use the formatting controls for bold, italic, underline, alignment and font. Use Add Text for a new text box.
Select an image to replace it while keeping its position and size, or to flip or rotate it. You can also add new images.
Use Find & replace to change a word or name everywhere in the document.
Click Export (or press Cmd+S / Ctrl+S) to download the edited copy. The file name gets “(edited)” added, and your original is untouched.
Why editing PDF text sometimes misbehaves
Three limits come from the PDF format itself, and every editor runs into them in some form:
- No real paragraphs. A PDF stores lines of positioned text. Adding a sentence will not push the rest of the page down or move text onto the next page. For rewrites longer than a sentence or two, it is usually quicker to edit the source document or convert the PDF to Word.
- Fonts are often incomplete. To keep files small, PDFs usually embed only the characters a document uses. If you type a letter that was never in the original, the editor has to substitute a different font, and the change may be visible. The font list includes common Latin fonts and several Chinese fonts for this reason.
- Scans have no text. On a scanned page, the words are part of a picture. Run OCR PDF first to see what can be recognised, or cover the area and add new text, accepting that the original pixels are still underneath.
Annotate: highlights, notes and drawings
Classic Annotator opens the PDF in a viewer with a markup toolbar: highlight, underline and strike-through for text, rectangles, circles, arrows and cloud shapes, sticky notes, free text, freehand drawing and stamps. Annotations are stored as standard PDF annotations, so Acrobat, Preview, Edge and most other readers show them, and recipients can usually reply to or remove them.
This mode also has a replace-text function. It removes the original text in that area and writes your new text in the original font if the font can be reused, or in a standard font if not. TokPDF warns you when it had to fall back to another font, or when the new text is longer than the space it replaces, so you can check the result before downloading.
Jobs that need a different tool
Some requests sound like editing but need a specialised tool to be done properly:
- Hiding sensitive information. Drawing a black box or covering text with a white rectangle hides it visually, but the text is usually still in the file and can be copied out. Use Redact PDF, which turns each page you redact into an image so the hidden text is really gone. The trade-off is that text on those pages can no longer be selected or searched.
- Filling in forms. If the PDF has form fields, Fill PDF Forms is faster and keeps the fields valid.
- Signing. Use Sign PDF; see how to sign a PDF for the difference between visible and digital signatures.
- Moving, deleting or rotating pages. Use Organize PDF or Rotate PDF rather than the editor.
- Adding page numbers or a watermark to every page. Page Numbers and Add Watermark do this in one pass.
Signed and archival PDFs
If a PDF carries a digital signature, any edit invalidates that signature. Direct Content Edit warns you and saves your changes as an appended revision, so the originally signed version remains verifiable inside the file, but readers will report that the document was changed after signing. If you need a signed document with corrections, edit first and have it signed again.
PDF/A files, used for long-term archiving, also trigger a warning: editing can make the file stop conforming to the PDF/A standard. If conformance matters, run the edited file through PDF to PDF/A afterwards.