Instagram Ad Preview — Feed, Reels & Safe Zone Simulator

Instagram allows captions up to 2,200 characters, but visibility is what counts. In the Feed, an ad caption is truncated at roughly 125 characters behind a "… more" link — the same practical fold as Facebook. In Reels, the usable space is far tighter: the caption sits over the video with the interface on top of it, so the comfortable window is about 40 to 72 characters before your words start colliding with on-screen controls. The simulator switches between both modes so you can see each cutoff.

Reels and Stories overlay your creative with interface elements: the profile and caption block runs along the bottom ~20%, and the action stack — like, comment, share, audio — occupies the right ~15%. Any text or critical subject you bake into those regions gets covered. Toggle the Safe Zone overlay to see these danger areas as translucent bands over your media, so you can reposition important elements before export.

Keep logos, captions, and calls to action inside the clear central column. Treat the bottom fifth and right edge as off-limits for anything that must be read. For Feed ads, front-load the hook in the first 125 characters; for Reels, keep on-creative text short and high-contrast so it survives compression and small screens.

PostTruncate runs entirely in your browser — paste a caption and attach a creative and nothing is uploaded or saved. Check the Feed fold, the Reels window, and the safe-zone collisions in real time, then publish knowing your message stays visible.