Load a "before" and "after" container export to see exactly what changed. Click any modified, added, or removed element to view a visual diff or a line-level JSON diff.
Drop GTM JSON export or click to browse
Drop GTM JSON export or click to browse
Load both containers above to see the diff.
Export both container versions as JSON from GTM under Admin → Export Container. Upload the older version as Container A and the newer version as Container B. The diff tool instantly shows every tag, trigger, and variable that was added, removed, or modified.
It shows a side-by-side comparison of two GTM container exports: which tags, triggers, and variables were added, removed, or modified. You can click any changed element to see a detailed field-level diff or a raw JSON diff.
Yes. As long as you have JSON exports from both versions, you can compare any two containers regardless of workspace or account. Export from GTM under Admin → Export Container for each version you want to compare.
No. The diff runs entirely in your browser. Your container JSON is never uploaded to any server — all processing happens locally.
Standard GTM container JSON exports, which you download from GTM under Admin → Export Container. These are .json files with containerVersion at the root.