A lightweight tool to compare two PDFs side-by-side. Built to feel like reviewing a pull request, but for contracts, policies, and documents that actually matter.
Sometimes you have two slightly different PDFs same title, same format, but sneaky differences that take a while to notice. This tool uses Cardinal’s Markdown API to normalize both files, then highlights changes line by line.
- Upload two PDFs (A and B)
- Backend calls Cardinal’s /markdown endpoint
- Text is extracted
- Frontend renders side-by-side diffs
- Backend: FastAPI, Python, Cardinal API
- Frontend: Vite + React + Typescript
- You can view the extracted text and PDF of each document uploaded
- Side by side comparison
- Can only support one page for each document due to API limitations
- Only accepts PDF
Upload your own documents or load the given sample to preview.
Try it here: https://doc-diff-three.vercel.app/
Currently, text extraction for the diff preview can produce inconsistent formatting between documents, which sometimes causes false-positive differences. Ensuring a standardized and deterministic extraction pipeline for both inputs is planned as a key improvement for future iterations.
