Reverse Video

Trim it first — this is the one filter that really needs it

Worth doing before anything else, and here is why.

Reversing a video is unlike almost every other edit, because it cannot be done a frame at a time. To know what the first frame of the output is, the software has to have read the last frame of the input — which means holding the entire clip in memory at once.

On a three-second clip that is nothing. On a two-minute 4K video it is several gigabytes, and on a modest laptop or a phone it will be slow or fail outright. The tool warns about this itself for anything over about thirty seconds.

So cut the clip down to the part you actually want reversed, then reverse that. It is faster, it is more reliable, and it is almost always what you wanted anyway — a reversed effect works in short bursts and becomes tiresome over a minute.

Three modes, and the third one is the interesting one

Video and audio is the default and the straightforward reverse: everything runs backwards, including speech, which becomes the familiar garbled sound.

Video only reverses the picture and leaves the audio playing forward. This is the mode to use for most real work — a reversed action shot with music over it, or a reveal effect where you want the soundtrack intact. The audio is copied across untouched rather than re-processed.

Audio only reverses the sound while the picture plays forward, and nothing else in this category offers it. It produces a genuinely unsettling effect, because your eyes see normal motion while your ears hear something structurally wrong — reverb arriving before the sound that caused it, words unwinding. It is a horror and music-video staple, and it is also the quickest way to make an ordinary clip feel uncanny without touching the footage.

If your clip has no audio track at all, the reverse still works — that case is handled rather than failing.

What reversing is actually good for

A short list, and being specific about it is more useful than "create amazing effects".

The impossible reveal. Film something being taken apart, dismantled, poured out or knocked over — then reverse it, and it assembles itself. A tower building from scattered bricks, liquid rising back into a bottle, a jumper folding itself. This is by far the most reliable use, because the reversed version of destruction is creation, and destruction is much easier to film.

The trick shot. Throw something and catch it, reversed, and you appear to have thrown it with impossible accuracy. Walk backwards away from a door and reversed you walk towards it. Anything that is easy in one direction and hard in the other.

The seamless loop. A clip followed by its own reverse can never jump at the join, because the end of the reverse is the beginning of the original. That is what a boomerang effect is.

Fixing a reversed clip. Occasionally footage arrives backwards — an old transfer, a mirror shot, a mistake in an edit. Reversing it puts it right.

What does not work: anything with legible text, a clock, falling rain or smoke, or a person speaking on camera. Text reads backwards, and gravity is the giveaway — smoke that flows into a cigarette or water that leaps upward reads as reversed immediately, which is fine if that is the point and ruinous if it is not.

Combine it with a speed change

The pairing that makes reversed clips look deliberate rather than gimmicky.

A reversed clip at normal speed often looks merely odd. Reversed and slowed down, it reads as dreamlike and gives the eye time to register what is impossible about it. Reversed and sped up reads as comic. Either is usually better than reversed alone, and both are a second pass on the output.

If you are doing several operations, do the reverse last. Every pass re-encodes the picture, and reversing is the most memory-hungry step, so it is the one you want operating on the smallest, shortest file.

What comes out

The output is always an MP4, which is right for anything going online. The picture is re-encoded, because every frame is being written out in a new order — one pass costs very little, but it is a reason not to run a clip through several tools in sequence.

Everything happens on your own machine. That is worth more here than for most video tasks, because reversing is the operation a server-based tool has to load entirely into its own memory — so your footage sits on their hardware for the duration. There is also no upload wait and no file size limit set by somebody else, and no watermark, which several free reversers add unless you sign up.

The one cost is that the video engine loads into your browser on first use — a one-off download of a few tens of megabytes, cached afterwards.

Related tools

Trim Video is the step to do first, since reversing needs the whole clip in memory. Create Video Loop has a boomerang mode that combines a clip with its own reverse automatically. Change Video Speed is the pairing that makes a reversed clip look intentional.