toolkitta.
Local file processing

Change Video Speed

Speed up a long clip or slow a moment down. Choose 0.25× to 4×, keep the voices at their natural pitch, and nothing is uploaded.

Your videos are never uploaded

Use this focused tool, then choose Edit in editor to carry originals and settings onto the timeline.

  • Speed & selection preview
  • No uploads · Preview before downloading
About Batch and Interactive Editor

How to use Interactive Editor

  1. Open Batch originals as a sequence, or choose Edit in editor to also carry your current settings.
  2. Select a clip to trim, split, slip, set speed, frame the picture or mix its sound. Add tracks, titles, images and music; Undo keeps changes reversible.
  3. Export MP4/WebM or explicitly save a project to keep originals and tracks editable. A recipe repeats the arrangement in either workflow mode.

Mode switching resumes independent sessions. Editor output uses one frame size up to a 1,920 px longest side / 30 fps, and re-encodes frames. Batch retains its existing fast operations and limits. Trim/Crop Batch still edit one video at a time.

Editor limits: 20 sources / 1 GB total, videos up to 500 MB and 15 minutes each, audio up to 50 MB / 15 minutes, 30-minute output. Saved projects include originals and their metadata. Recipes contain only settings and generic source slots; nothing is saved automatically.

How it works

How to change the speed of a video in Batch

  1. Add up to 20 MP4, MOV, MKV or WebM videos, 500 MB each.
  2. Choose a speed: 0.5× or 0.25× for slow motion, 1.5× or 2× to get through a talk faster, up to 4× for a time-lapse feel. Pick Custom to type an exact rate.
  3. Click Change speed, play each result and download one video or a ZIP. Use Also to mute, add music, resize or compress in the same pass.

Turn twelve seconds into six

Add the 12-second practice MP4, choose 2× and click Change speed with the optional Also steps off.

Expect about six seconds of video at the same 640 × 360 frame size. The shapes should move twice as fast while the tone keeps approximately the same pitch. Play the beginning and end to check synchronization.

At 0.5× this source becomes about 24 seconds. It does not gain new motion detail: very slow playback can look jerky, and speed changes re-encode the picture.

Frequently asked questions

Useful details

5 answers
Can I arrange clips on a timeline?

Yes. Interactive Editor offers tracks, trim/split/slip, per-clip speed, framing, titles and audio mixing. Edit in editor carries Batch originals and settings. Each mode retains its own session.

Does the sound change pitch?

No. The sound is stretched to the new length while keeping its pitch, so voices do not turn squeaky or deep. At extreme speeds speech becomes harder to follow; use Also → Mute to drop the sound, or Music to replace it.

Can I change the speed of only part of a video?

In Batch, the whole video changes speed. Interactive Editor can split a clip and change just that section. To speed up one section, cut it out with Trim Video, where Speed is available under Also.

Why does the video take a while?

Changing speed re-times every frame, so the picture is re-encoded by your browser. Processing time depends on clip length, resolution and the device. Keep the tab open.

Is my video uploaded?

No. Everything happens in your browser on this device, and there is no watermark.

More help

Guides, common conversions and useful next steps.

Edit the video

Arrange clips, music and titles together on a local timeline.

Continue with your result

Use the action beside a finished result to send it directly, or open another tool: