Check what changed between two versions of a deck: slide titles, bullet points, tables and speaker notes. Each slide is marked, so you can find the change in PowerPoint quickly.
How to compare presentations
- Drop the original .pptx on the left.
- Drop the revised .pptx on the right.
- Jump between changes with F7; each slide starts with a marker line.
Why Diffspot
- Slide by slideText is extracted in slide order with clear slide markers, including notes.
- Nothing is uploadedThe comparison runs in this browser tab, in WebAssembly. Your text and files are never sent to a server, not even ours, and nothing is saved.
- Fast on big inputsThe diff engine is written in Rust and runs in a background thread, so typing stays smooth. Files with hundreds of thousands of lines compare in about a second.
- Free, no accountEvery feature is free with no sign-up and no size paywall. Ads pay for the site, and they run in an isolated frame that can't read the page.
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Frequently asked questions
Are images or animations compared?
No, only the text on slides and in notes.
Is it safe to paste confidential text or files?
Yes. Diffspot computes every comparison on your device: the page loads the engine once, then your text and files stay in the browser tab. There is no upload and no server-side storage, and ads are shown in a separate sandboxed frame that cannot read the page. How Diffspot works explains the details, and you can confirm it in your browser's network panel.