Read it. Mark it up. Ship it.
Open PDFs, DOCX and Excel (.xlsx) right in your browser. Highlight, annotate, edit and export — without leaving the page.
Everything on the page, nothing in the way.
Open anything
PDF, DOCX, TXT and Excel (.xlsx) all open in the same viewer.
Annotate freely
Highlights, notes, shapes, and pen — kept in sync with the source.
Edit spreadsheets
Browse and edit .xlsx sheets with formulas preserved on export.
Real editing
Rewrite paragraphs in DOCX, not just scribble on top.
Export clean
Download flattened PDFs or updated DOCX/XLSX in one click.
AI helpers
Summarize, translate and pull tables without leaving the doc.
How Marginal works
- Step 1
Open a document
Drop in a PDF, DOCX, TXT or XLSX file — it opens directly in the browser.
- Step 2
Read, annotate or edit
Highlight, add notes and shapes, or rewrite text and spreadsheet cells.
- Step 3
Use available AI tools
Summarize, translate or pull tables out of the document you have open.
- Step 4
Export your work
Download a flattened PDF or an updated DOCX/XLSX in one click.
Who is Marginal for?
Students
Mark up lecture notes and readings, then export a clean annotated copy.
Professionals
Review contracts and reports, edit DOCX text and fix spreadsheet numbers fast.
Researchers
Highlight papers, keep notes beside the source and extract tables for analysis.
Everyday users
Open a file someone sent you, make the change and send it back — no installs.
Frequently asked questions
Which file formats does Marginal support?+
PDF, DOCX, TXT and Excel (.xlsx) files all open in the same workspace.
Can I annotate PDFs?+
Yes — highlights, notes, shapes and freehand pen, kept in sync with the page.
Can I actually edit DOCX files?+
Yes. You can rewrite paragraph text in DOCX documents, not just draw on top of them.
Can I edit spreadsheets?+
You can browse and edit .xlsx sheets, and formulas are preserved when you export.
Does Marginal work on a phone?+
Yes. The workspace is responsive: the toolbar wraps and the annotation panel collapses so the document gets the screen.
What can the AI tools do?+
They summarize, translate and extract tables from the document you currently have open.
How do I get my file back out?+
Export a flattened PDF or an updated DOCX/XLSX directly from the workspace.
Do I need to install anything?+
No. Marginal runs entirely in the browser — just open the workspace and load a file.