To speed up a video that was slowed down back to normal speed, you basically need to increase its playback rate using a video editor or an online tool until the motion and audio look and sound natural again. In most cases that means setting the clip to 1× (normal) or, if it was recorded in slow motion, applying a multiplier like 2×, 4×, etc., depending on how much it was slowed.

Why videos look “too slow” in the first place

Slow motion usually happens in one of two ways:

  • The footage was recorded at a high frame rate (e.g., 60/120/240 fps) and played back at a standard rate (e.g., 30 fps), which makes it look slow.
  • The editor or app intentionally reduced the playback speed (e.g., to 0.5× or 0.25×).

To reverse that, you either:

  • Change the clip’s speed/duration in your editor, or
  • Use a dedicated “change video speed” tool online or on your device.

Quick methods by platform

On a computer (Windows / Mac)

Using a desktop editor (e.g., Clipchamp, Filmora, DaVinci Resolve, Premiere, etc.) General steps are similar across apps:

  1. Import your slowed video into the project.
  1. Place it on the timeline.
  1. Select the clip and open the Speed / Duration or Time Remapping settings.
  1. Increase the speed:
    • If it was slowed to 0.5×, try 2×.
    • If it was 0.25×, try 4×.
    • Or just drag the slider until it looks and sounds normal.
  1. If there’s separate audio, make sure its speed is adjusted the same way so it stays in sync.
  1. Preview, then export the video.

Some editors also let you:

  • Right‑click the clip → “Speed/Duration” → set a percentage (e.g., 200% for 2×).
  • Use “Time remapping” to speed up only certain parts.

Using an online tool (no install needed) Sites like Clideo, Adobe Express, Flixier, Online Video Cutter, and Ezgif let you change speed in the browser:

Typical workflow:

  1. Go to a “change video speed” tool (search: change video speed online).
  1. Upload your slowed video from your device or cloud storage.
  1. Move the speed slider or choose a multiplier:
    • Choose 2×, 3×, 4×, etc., or drag until it looks normal.
  1. Optionally mute or change format, then export/download.

These are handy if you don’t want to install software and your file isn’t huge.

On iPhone / Android

Built‑in options (varies by device and app):

  • In some gallery or video editor apps, you can:
    1. Open the video in the editor.
    2. Tap a “Speed” icon.
    3. Slide toward faster (1×, 1.5×, 2×, etc.) until it looks normal.
  • If the video was saved as a “slow‑mo” clip (e.g., iPhone Slow Mo), you may be able to:
    1. Open it in Photos.
    2. Tap “Edit”.
    3. Adjust the yellow slow‑mo range so more of the clip plays at normal speed, or remove the slow‑mo effect entirely if the app allows.

If the built‑in editor doesn’t give enough control, use a mobile app like CapCut, InShot, or VN:

  1. Import the video.
  2. Select the clip → Speed.
  3. Increase speed (e.g., 2×, 3×) until it looks right.
  4. Export.

How to pick the “right” speed multiplier

If you know how the video was slowed:

  • Recorded at 120 fps, played at 30 fps → play at 4× to get normal motion.
  • Manually set to 0.5× in an editor → set to 2×.
  • Set to 0.25× → set to 4×.

If you don’t know:

  • Start with 1.5× or 2×, preview, then adjust up or down until:
    • Movement looks natural.
    • Voices (if any) sound normal, not chipmunk‑like or dragged.

Some tools mention that non‑constant speed ramps (where speed changes within the clip) can cause audio/video sync issues when you speed them back up. If that happens, you may need to:

  • Mute the original audio and add new audio, or
  • Use more advanced editors that handle variable speed better.

Common pitfalls and fixes

  • Audio sounds weird or out of sync
    • Make sure you’re also speeding up the audio track with the video, or detach and retime it separately.
* If it still sounds off, try a slightly different speed (e.g., 1.9× instead of 2×).
  • Motion looks jittery or stuttery
    • This can happen if the original was heavily slowed or used variable frame rates.
* Try different interpolation settings if your editor offers them (e.g., optical flow vs. frame blending).
  • File is too large for online tools
    • Compress the video first or use desktop software instead of browser‑based editors.

Mini step‑by‑step example (generic online tool)

  1. Open a “change video speed” website.
  1. Click “Upload” / “Choose file” and select your slowed video.
  1. Find the speed control:
    • Drag the slider toward faster, or pick 2× / 3× / 4×.
  1. Watch the preview:
    • If still too slow, increase the multiplier a bit more.
    • If too fast, lower it.
  1. When it looks normal, click “Export” / “Save” and download the fixed video.

If you tell me what device/app you’re using (e.g., iPhone Photos, CapCut, Premiere, Clipchamp), I can give you exact clicks/taps for that specific setup. Information gathered from public forums or data available on the internet and portrayed here.