Best AI tools to extend
a video you already have in 2026

It adds new seconds to a clip you already have, continuing from the last frame with the same subject, lighting and style. You upload the clip and the tool returns a longer video.

It depends on how many seconds you need and whether you want to steer what happens next. Kapwing lists generations up to 30 seconds, Magic Hour adds 4 seconds, Fotor 4 or 8 and Vidu 1 to 7, Dzine offers a free trial and sells longer extensions, and Inflyu adds 4, 6, 8, 10, 12 or 15 seconds from a line you write and charges per run. We make Inflyu, so check the linked vendor pages for the others.

The price depends on how many seconds you add. The exact price is shown on screen before anything runs.

Yes, to start. Sign-up is free: 20 credits, no card. Verify your email to use them. Google sign-in doesn't count. A free account’s one short video covers an extension of 4 or 6 seconds, up to 6 seconds. Adding 8, 10, 12 or 15 seconds, a second extension or any later run uses purchased credits, from a pack starting at $2.99. A free account’s extension carries a small "Made with inflyu" mark and a short Inflyu card at the end. Any credit pack removes both on new outputs, with no subscription needed. Magic Hour and Dzine also list a free way to try, each with its own limits, in the table above.

Upload a clip of 1.7 to 14.9 seconds. You add 4, 6, 8, 10, 12 or 15 seconds, and the longer video comes back as a new file with your original untouched. For the others, Kapwing lists generations up to 30 seconds, Fotor adds 4 or 8, Magic Hour adds 4 and Vidu adds 1 to 7, so a long extension takes several runs in most tools.

The extension runs in the background and the longer video lands in your library. No typical time is quoted, because it has not been measured for extensions.

A clear, stable clip with one main subject, of 1.7 to 14.9 seconds in Inflyu. Vidu's page says it works best when the source is clear, stable and already close to the result you want, and Magic Hour says fast cuts, heavy motion blur or sudden scene changes can reduce continuity.

No. Credit packs are one-time purchases that start at $2.99, and pack credits never expire. If you would rather refill each month, monthly plans exist too, and unused monthly credits do not roll over.

Each competitor fact links to the vendor page it came from and shows the date it was read, most recently 7 Nov 2026. Plans and credits change often, so confirm on the vendor page before you pay. If a fact could not be confirmed on a vendor page, it is left out.

Each run adds only 4, 6, 8, 10, 12 or 15 seconds to a source of 1.7 to 14.9 seconds, so a long extension needs several runs, and a free extension carries a small mark and a short Inflyu card until the account has paid once. Use only clips you have the rights to.