Infix PDF Editor

Infix PDF Editor for Windows is a PDF editor built around a word-processor style of editing, aimed at making direct changes to existing PDFs feel more like working in a familiar document tool, rather than a page-by-page graphic workaround.

It’s a good fit for anyone who needs to revise finished PDFs, plus translators who want PDF-focused translation features (including side-by-side comparison and automatic translation) alongside practical editing tools.

Editing that behaves like a document, not a picture

Infix’s core appeal is how it approaches text editing: you can change anything from a single word to larger sections, with the editor handling text reflow and reformatting so the page keeps a polished look after revisions. It also supports changing text formatting such as fonts, size, and color, which helps when corrections need to blend into the original design instead of standing out.

Find, replace, and spellcheck that support real revision cycles

For repetitive fixes, Infix includes advanced Find & Replace, and it can run find-and-replace across multiple PDF files when you need consistent wording updates across a set of documents. A built-in spell checker supports proofreading after edits, with language selection available from inside the spelling workflow.

Handling scanned pages with OCR options

When a PDF page is effectively an image, Infix offers OCR to turn it into something you can work with. You can choose between results geared toward editable text or a searchable image approach that keeps the scanned look while enabling text search. There’s also an OCR correction mode designed to help adjust recognition results when the hidden text needs cleanup.

Translation features and side-by-side comparison views

Infix supports both professional translation workflows (including XLIFF export and re-import via its TransPDF integration) and automatic translation for quicker, rough results. For languages written right-to-left, it can adjust paragraph direction and can mirror page layout to match the target reading order. It also provides side-by-side comparison modes and a broader PDF comparison feature that can highlight differences in appearance or content between two similar PDFs.

Forms, redaction, and document finishing tools

Beyond editing, Infix covers several finishing tasks that often come up in business PDFs. It supports filling in both interactive and non-interactive forms, and it includes tools for adding and adjusting form fields when you need to build or modify a form. For privacy work, it can permanently redact both text and images, with redaction designed to remove content from metadata, bookmarks, and comments as well. It also supports headers and footers (including Bates numbering and page numbering options), plus options related to digitally signed PDFs and saving in PDF/A format.

Where it can feel limiting

Infix is powerful, but it still depends on the quality of the original PDF. OCR can introduce recognition errors that may affect search accuracy, and the editor itself warns that reflowing text in unusually shaped paragraphs can disrupt layout. Spell checking can also run into trouble when a PDF’s fonts are improperly encoded. Finally, some workflow expectations may not match: copy and paste of graphics from Infix into other applications is not supported, and PDF comparison is designed for documents that share the same page count.