Change speed and know what happens to the sound
Open Change video speed and enter a factor between 0.25 and 4. At 2 a six-second recording lasts three seconds; at 0.5 it lasts twelve. You can keep the sound or remove it. Kept sound is resampled together with the picture, so the pitch changes: speech sounds higher when accelerated and lower when slowed, like a tape. Slow motion does not create intermediate frames, so movement can look choppy at low speeds, and above 1× the picture is capped at 60 frames per second. Process one factor at a time and always watch the first and last seconds.
Add fades without losing content
Add video fade in and out lets you set a fade at the start and another at the end, each from 0 to 10 seconds. A value of 0 skips that side, and the two together cannot exceed the video’s duration. Choose black or white and decide whether the sound follows the same ramp; leaving it on avoids a picture that dims while the audio stays loud. The duration does not change because the fade works on the existing frames. The final frame may not be completely black, since each frame is measured at its beginning. Listen to both ends with headphones before sharing.
Adjust color in small, comparable steps
Adjust video color changes brightness and contrast between 50 and 150 percent and saturation between 0 and 200 percent, with optional black and white or sepia. A value of 100 keeps the original, and at least one setting must differ. Make one change, compare the result with the original on faces, skies and shadows, and only then add another. Extreme values clip highlights or shadows and cannot recover detail that was never recorded. The same transformation applies to every frame, so it is not a scene-by-scene grade. Screens vary, so review the copy on the device where it will be viewed.
0:06 · 2× → 0:03 30 · 320 × 180
Hide a fixed area and choose the right method
Blur or hide part of a video covers a rectangle defined by percentages from the top-left corner: distance from the left, distance from the top, width and height. The area never moves, so use it for something that stays in one place and watch the whole video for moments when the subject leaves it. Blur and pixelation reduce detail but may leave small text or a distinctive shape recognizable; covering with black is the safest choice for plates, documents or passwords. The sound is kept, so voices can still identify people. Keep the original private.
Turn a short section into a GIF and keep it light
Convert video to GIF takes a start time, a length from 0.5 to 30 seconds, a width of 320, 480 or 640 pixels and 5, 10 or 15 frames per second, with a maximum of 300 frames. The result loops, has no sound and uses one palette of 256 colors, so gradients can show bands. The tool never enlarges beyond the original width. To reduce weight, shorten the clip, narrow the width or lower the frame rate. Play the preview, check where it repeats and compare the file size with where you will publish it.
Five edits you can verify
Download sample-video.mp4 and open Change video speed with factor 2, keeping the sound. Open Add video fade in and out with one second at each end, then Adjust video color with Black and white, and Blur or hide part of a video covering 0 %, 0 %, 50 % × 50 % with black. Finally, in Convert video to GIF choose start 0:01, three seconds, 320 px and 10 frames per second. Preview and download each result separately from the original.
0:06 · 2× → 0:03 30 · 320 × 180
The accelerated copy lasts about three seconds with sound. The fade copy begins and ends dark. The black-and-white copy has no color and the covered corner is black. The GIF has 30 frames and measures 320 by 180 pixels.
Compare every output with the original rather than with another edit, and listen to the faded and accelerated copies. A change that looks right in the preview should also be checked in the player where you will publish it. Your own recordings may behave differently from this small sample.