Free diff tool

Compare two files

Drop two revisions of a file and see what changed - in the browser, free, no account. Eleven formats, each with a sample pair preloaded so you can see how the comparison reads before handing it your own files.

Open the diff tool

Or pick a format below for the guide and a preloaded sample.

Pick your format

Each guide covers what the comparison shows for that format, how the alternatives stack up, and the honest fine print - size limits, what happens to your files, when another tool is the better answer.

Compare two Excel files

Diff two Excel files in your browser, free, no account.

.xlsx

Compare two PDF files

Diff two PDF revisions in your browser, free, no account.

.pdf

Compare two Word documents

Redline two Word documents in your browser, free, no account.

.docx

Compare two PowerPoint files

Diff two PowerPoint decks in your browser, free, no account.

.pptx

Compare two Visio files

Diff two Visio diagrams in your browser, free, no account.

.vsdx

Compare two STEP files

Diff two STEP files in your browser, free, no account, no CAD seat.

.step

Compare two DXF files

Diff two DXF drawings in your browser, free, no account, no AutoCAD.

.dxf

Compare two Rockwell PLC exports

Diff two Rockwell .L5X exports in your browser, free, no account.

.l5x

Compare two images

Diff two images in your browser, free, no account.

.png

Compare two SVG files

Diff two SVG files in your browser, free, no account.

.svg

Compare two JSON files

Diff two JSON files in your browser, free, no account.

.json

From an AI agent or a script

The same comparison is one HTTP call away, with no account. POST the two files and hand the returned link to whoever asked - it renders the diff for anyone who opens it, for seven days.

curl -F before=@bom-v1.xlsx -F after=@bom-v2.xlsx \
  https://work.withkord.com/api/diff/share

The JSON response carries a url. Files over about 4 MB together go through an upload step first; that, the size cap and the expiry are in Kord's OpenAPI document.

Why a diff tool is free

We build Kord - version control for engineering document sets, where these same comparisons run between revisions of every file in a package, with review sessions and an audit trail around them. A diff you can try in ten seconds, on a sample BOM or your own files, explains that better than we can. If the two files you keep comparing are part of a bigger set that has to stay consistent, start with Git for documents.

Let's get started

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