Glossary of PDF Terms

Inserting blank pages, pages from another PDF, or photos into a PDF document at the position you choose.

Notes, highlights, underlines, or strikethroughs added to a PDF as comments, without changing the content of the document.

A table of contents shown in the side panel of a PDF reader. Each title can be tapped to jump straight to the chapter or page it points to.

Matching two versions of a PDF document to see which text was added, removed, or changed between them.

Trimming the edges of a PDF page, such as white margins that are too wide. Content outside the crop area is only hidden and still exists in the file.

Removing pages you do not need, such as blank pages or the wrong attachment, then saving the rest as a new PDF.

The Microsoft Word document format. PDF to Word gives you a DOCX file with paragraphs, headings, lists, and tables you can edit in Word, Google Docs, or WPS Office.

A measure of how many image dots fit into one inch. The higher the DPI, the sharper the converted image or printout, but the larger the file size.

Adding new text, images, or drawings to the pages of a finished PDF, without having to recreate the document from scratch.

An image of a signature, initials, or name placed on a PDF document as a sign of approval. On UbahPDF the signature is visual, not a digital certificate.

A digital book format whose text adapts to the screen width, so readers can change the font size in e-book apps on phones, tablets, or e-readers.

Saving the photos and other images stored inside a PDF as separate image files, at their original resolution.

Taking specific pages from a PDF and saving them as a new document, while the original file stays intact.

Merging form entries and annotations into the page, so the content can no longer be changed through normal form filling.

A document view without color, using shades of gray from black to white. Black and White mode in UbahPDF keeps only pure black or white instead.

Text repeated along the top edge (header) or bottom edge (footer) of the page, such as the document title, organization name, date, or page number.

The default photo format of the iPhone and iPad camera, which takes up less space than JPG. Many online forms and older apps still cannot open it.

A slide that stays saved in a presentation but is skipped during the slideshow. When PowerPoint is converted to PDF, these slides are left out unless you choose to include them.

Marking important text in a PDF with a highlighter color so it is easy to find again when reading or reviewing the document.

The language web pages are built with and opened in a browser. PDF content converted to HTML can be read comfortably on a phone, searched, or uploaded to a website.

The most common image format for photos from cameras and phones. Files stay small because fine detail is compressed, so they are easy to share or turn into a PDF.

Processing files directly on your own device in the browser, without uploading them to a server, so document content never moves to anyone else.

A simple text format that uses marks such as # for headings and * for lists. Markdown can be turned into a neat PDF or created from the content of a PDF.

Combining several PDF files into one document, with a file order you can set and pages you can pick from each file.

Hidden information attached to a PDF file, such as its title, author name, creator app, and creation date. It is worth checking before you share a document.

Automatic text recognition that reads the writing in scanned images, then adds text you can search and copy to the PDF.

The open document formats of LibreOffice and OpenOffice: ODT for text documents, ODS for spreadsheets, and ODP for presentations.

Reordering the pages of a PDF while rotating, duplicating, deleting, or inserting blank pages, before saving the result as a new document.

Stacking pages from one PDF behind or in front of the content of another PDF's pages, such as a letterhead, blank form, or stamp.

Sequential numbers printed on the pages of a document, usually at the bottom, so readers can easily refer to and order the pages.

The paper dimensions of a page, such as A4 or US Letter. Adjusting it makes the document fit properly when printed on the paper you intend to use.

Arranging 2, 4, 8, or 16 PDF pages on one sheet of paper to save paper when printing, for example for handouts or study notes.

A document format that looks the same on every device and printer, complete with its text, images, and layout. It is the standard format for sharing and printing documents.

Reducing the size of a PDF so it is easy to send or upload to a portal. Quality mode keeps text selectable, while the other modes turn pages into images.

A PDF document with fields, checkboxes, or choices you can fill in directly on screen, then save or print without writing by hand.

Protection that lets only people who know the password open a PDF. The document content is scrambled with AES-256 encryption so it cannot be read without the password.

Reorganizing the content of a PDF so the first page can already be read when it is opened from a website, before the whole file has finished downloading.

Writing without formatting such as bold, color, or layout. A TXT file contains plain text and can be opened in any app.

An image format that keeps detail without losing quality and supports transparent backgrounds. Well suited to screenshots, logos, and graphics with sharp lines.

The PowerPoint presentation file format, made up of slides. PDF to PowerPoint gives you a PPTX file with one page image per slide, ready to present or add notes to.

The part of an Excel worksheet marked for printing. When Excel is converted to PDF, only the print area goes into the PDF, and sheets without one are scaled to fit the page width.

A website you can install like an app on a phone or computer. In UbahPDF, saved tools keep working without internet.

Turning every PDF page into an image inside a new PDF, so the text can no longer be selected or copied and fonts look the same on every device.

Permanently blacking out confidential text or images in a PDF, such as ID numbers or personal data, before the document is shared with others.

Recovering a PDF that shows errors or will not open because its file structure is damaged or cut off, so the pages whose data remains can be opened again.

Turning PDF pages that are sideways or upside down by 90 degrees to the left or right, then saving them so they appear upright in PDF readers.

A formatted text document format that almost every word processor can open, with bold text, tables, and images.

Turning photos of documents from a phone camera or gallery into a neat PDF, with Grayscale, brightness, and contrast settings so it looks like the output of a scanner.

Cutting one PDF page into two parts, such as a book scan that holds two pages on one sheet, so they become single pages in order.

Breaking one PDF into separate files by page range, every few pages, or one file per page. Odd/Even mode takes only the odd or even pages.

A font used when a document's original font is not available, such as Carlito for Calibri. Matching character widths keep the layout of the converted PDF close to the original.

An image format built from lines and shapes rather than dots, so it stays sharp when enlarged. Commonly used for logos, icons, and illustrations.

A high-quality image format often produced by scanners and fax machines. A single TIFF file can hold several pages at once.

Removing the password and print or copy restrictions from a PDF whose password you know, so the file opens without entering the password again.

Transparent text or a logo placed over the page, such as the word CONFIDENTIAL or the owner's name, to mark who owns the document or what its status is.

A modern image format widely used by websites and Android phones because of its small size, though not every older app can open it yet.

The Microsoft Excel spreadsheet file format. PDF to Excel gives you an XLSX file with one sheet for each PDF table, with numbers ready to sum and text kept as it is.