LaTeXdiff Online

LaTeXdiff Online is a free browser tool that shows you exactly what changed between two versions of a LaTeX document - without installing anything locally. Problem: If you've ever tried to track changes in a LaTeX paper for journal resubmission, you know the pain. The standard tool - latexdiff - is powerful but requires a working Perl installation, correct PATH setup, and command-line familiarity. For most researchers, that's a wall. Existing online alternatives either handle only single .tex files (useless for real papers with \input{} or \include{}), or they're buried inside bloated LaTeX editors you don't want to sign up for. What this tool does - Upload your original and revised LaTeX project as ZIP files - Or paste .tex content directly for quick single-file diffs - Get a compiled diff PDF showing additions and deletions in the standard latexdiff style - Supports multi-file projects — figures, bibliography, included chapters all work Who it's for PhD students and researchers submitting to journals that require a tracked-changes PDF alongside the revision. Also useful for co-authors reviewing each other's edits before submitting. Why I built it I run The LaTeX Lab, a document conversion service for researchers. Clients kept asking for help with resubmission diffs. Every tool I tested either choked on multi-file ZIPs or required local setup. So I built the thing I wished existed. It's free. No signup. No file size tricks. Just upload and get your diff. → https://thelatexlab.com/latexdiff-online/