Change Video Speed Online for Free
Change video speed from 0.5× to 2× and save a new MP4. Slow a movement down or shorten a recording while its soundtrack follows the chosen pace.
How to change video speed for an entire clip
- Choose the clip you want to speed up or slow down.
- Select a multiplier. At 0.5× the clip takes twice as long to play. At 2× it takes half as long.
- Export and listen to a spoken line to check the new pace.
How long will a 24-second source play?
- 0.5×
- 48 s
- 0.75×
- 32 s
- 1×
- 24 s
- 1.25×
- 19.2 s
- 1.5×
- 16 s
- 2×
- 12 s
The dashed line marks the original 24 seconds at normal speed. A longer bar means more viewing time. At 2× the entire recording fits into 12 seconds, including its opening and closing pauses. If you remove a pause first, calculate the running time from the trimmed clip. The figures are estimates. Check the duration of the exported file for an exact delivery limit.
Choose a speed for movement or speech
The multiplier describes how quickly the source plays relative to its original speed. Choose 0.5× or 0.75× to give the viewer more time to follow the action. Choose 1.25×, 1.5× or 2× to shorten the running time. The 1× option keeps the original pace. The setting applies from the beginning of the selected file to its end.
When you change video speed for spoken material, listen to a sentence that contains a name, a measurement or a list of instructions. At a faster setting a familiar sentence may still be easy to follow, while a new name or a string of numbers becomes hard to catch. Try a modest increase first and listen without reading the original transcript. A difficult phrase is often a better test than long gaps between speakers.
For a physical movement, look for a particular event that must remain visible. A hand touching a control or a ball leaving the frame gives you a distinct reference point. Slowing the clip gives the viewer longer to examine that event. The source still needs to contain a frame that actually shows it. An action that happened entirely between two recorded frames cannot be recovered by extending the duration.
Calculate the time available in the finished video
To estimate the new duration, divide the source duration by the selected multiplier. A 24-second clip at 1.5× lasts about sixteen seconds. At 0.75× it lasts about thirty-two seconds. Working in seconds first avoids the common mistake of treating a minute and thirty seconds as 1.30 minutes when calculating how much will fit.
If you need to change video speed to fit a fixed slot, divide the source duration by the time available. For example, fitting thirty seconds of footage into twenty seconds requires a multiplier of 1.5. If the exact value you calculate is unavailable, decide whether it is better to keep the nearest slower setting and trim the content, or accept a shorter finished video at the next faster setting.
Remember that a pause will also change length. A title held on screen for four seconds in the source will stay visible for about two seconds at 2×. If viewers need that reading time, use a separately edited title or change the speed of only the moving section in an editor. This page uses one multiplier for the full file.
Check the picture and soundtrack together
When you change video speed here, the timing of the picture and the tempo of an existing soundtrack are adjusted together. Use an event that produces both a visible change and a short sound to check the result. Good reference points include a finger making contact with a key or a door closing. Compare those moments in the downloaded copy with the same events in the original.
A fast export can make quiet intervals between words very short. Slowing speech can make breaths and room noise more prominent because they last longer. Listen with the player set to normal speed. If a player is still set to 1.5× from a previous viewing, it will apply another speed change on top of the one already saved into the file.
Subtitles drawn into the video follow the pictures because they are part of the frames. A separate SRT or VTT file keeps its original timecodes until you edit them. To match a separate subtitle track, divide each original start and end time by the multiplier and check a line near the beginning and near the end. Include any trim offset if you also removed material from the front of the source.
Should I change video speed or change the frame rate?
Choose this tool to change video speed when a movement needs to take more or less time on screen. Use the frame rate tool when a player or editor asks for a particular number of frames per second and the action should still take the same amount of time. A request for 30 fps on its own tells you nothing about whether an instruction should be delivered twice as quickly.
After you change video speed, open the saved MP4 and check its reported duration. Then watch a segment with the smallest important movement or the densest dialogue. If fine motion appears uneven when slowed, a recording captured with more frames per second may give you more distinct positions to work with. Increasing only the playback time does not add detail that the camera missed during exposure.
Questions about changing video speed
Can I change video speed for just one scene?
The selected multiplier applies to the whole file. To give one scene a different pace, split or trim the recording first, export that scene at the desired speed, then reassemble the clips in their intended order.
Will a silent clip gain a soundtrack?
The audio adjustment works on sound already present in the source. It cannot generate speech or background music for a silent recording. Add a separate soundtrack afterwards if you need music matched to the new duration.
Can I change video speed without saving a new file?
For your own viewing, a player with a playback-speed control can slow or accelerate the original temporarily. Export a new copy here when the new timing should also apply in another player or when the file is shared.