PDF Editor

A PDF is not a document in the way a Word file is. It is a set of drawing instructions — place this glyph at these coordinates, in this font, at this size. There is no paragraph model underneath, which is why no PDF editor lets you click a sentence and retype it the way you would in a word processor. What editors actually do is add a new layer on top of the existing page, and sometimes cover or rebuild what was already there.

That distinction explains most of the confusion people hit with PDF editors, so it is worth being direct about it here. This editor gives you three different ways to deal with content that is already on the page, and they are not interchangeable.

Text you add is drawn with one of the three PDF standard font families — Helvetica, Times, or Courier — each with regular, bold, italic, and bold-italic variants. These are guaranteed to render identically in every PDF viewer without embedding a font file, which keeps the export fast and the output portable.

It also means added text will not perfectly match a document set in a custom brand typeface. When you are filling a gap in an existing paragraph, Times is usually the closest match for serif documents and Helvetica for sans-serif ones. For a form or a signature block, the mismatch rarely matters. For a page where your text sits mid-sentence in body copy, it will be visible on close inspection.

The standard fonts also cover a Latin character set. Text in Devanagari, Tamil, Chinese, or other non-Latin scripts cannot be drawn this way — for those, type the text in an image editor and place it with the Image tool instead.

If a PDF was authored as a fillable form, the editor reads its existing fields and lists them for you to fill directly. Text boxes, checkboxes, radio groups, dropdowns, and list boxes are all supported, and your values are written back into the real form fields rather than stamped on top — so the output stays a working form.

Some field types are listed as unsupported. Signature fields and unusual widget types cannot be filled programmatically in the browser; for those, use the Signature tool to place a drawn or typed signature over the field area instead. If a form has no fields at all — a common case with scanned or flattened documents — nothing will be listed, and the right approach is to add your own text and checkbox fields, or simply type on top.

PDFs are the format people use for exactly the documents they should be careful with: offer letters, bank statements, lease agreements, medical reports, signed contracts. Uploading those to a stranger's server to move a text box is a poor trade.

Page rendering uses pdf.js and the final document is assembled with pdf-lib, both running as JavaScript in this tab. The file you pick is read into memory by the browser, and the edited PDF is generated and handed to your downloads folder from the same place. There is no upload step, which also means large files are limited by your own device's memory rather than a server-side size cap, and the editor keeps working if your connection drops mid-edit.