How to Compare Two Prompt Versions
Use the Prompt Diff tool to see exactly what changed between two versions of an LLM prompt.
Tool Used
Prompt Diff
Paste your original prompt
Place the baseline version of your prompt in the left textarea. This is the version you are comparing from.
Paste the revised prompt
Place the updated version in the right textarea. The diff calculates automatically as you type.
Review the highlighted diff
Green lines are additions, red lines are removals, and dimmed lines are unchanged context. This makes it easy to spot unintended changes alongside intentional ones.
Check the summary
The summary below the diff shows total lines added and removed, giving you a quick sense of how much the prompt changed.
Iterate live
Edit either textarea and the diff updates immediately — no need to click a button. Keep refining until the diff shows only the changes you intended.
All done!
You are ready to use Prompt Diff like a pro.