How to Edit Videos in Your Browser (No App, No Watermark)

To edit a video in your browser, open the free Video Editor, drop in your clip, use the Trim, Crop, Rotate and Speed & sound tabs, pick an export format, and press Export. Everything runs on your own device with FFmpeg, so there's nothing to install, no upload and no watermark on the result.

This guide walks through each tool and explains which settings to use for TikTok, Instagram, YouTube, WhatsApp and email.

What can the browser video editor do?

The editor covers the everyday jobs that usually send people to a heavy app:

• Trim: keep only the part you want, with start and end sliders and a "Set to playhead" button.
• Crop: cut the frame to 9:16 (TikTok, Reels, Shorts), 1:1 square, 4:5 Instagram post, 16:9 YouTube, or a free shape.
• Rotate and flip: turn sideways phone videos upright, mirror a selfie video, or flip it upside down.
• Speed and sound: from 0.25× slow motion to 4× faster, with the sound keeping its pitch; change the volume or mute.
• Export settings: choose MP4, WebM, GIF or MP3, the resolution (original, 1080p, 720p, 480p or 360p) and the quality (High, Balanced or Small file).

If you only need one job, there are shortcuts that open the right panel straight away: Crop Video, Change Video Speed, Rotate Video, Video to GIF, Video to MP3 and Compress Video.

How do I edit a video step by step?

1. Add your video. Drag an MP4, MOV, WebM or MKV file onto the box, or click to choose one. Files up to about 2 GB work on a computer; phones with less memory have a lower limit.
2. Trim. On the Trim tab, drag the start and end sliders, or play the video to the right moment and press Set to playhead.
3. Crop. On the Crop tab, pick a shape. A crop box appears on the video; drag it into place, resize it from the corners, or move it with the arrow keys.
4. Rotate. Use Left or Right to turn the picture 90° at a time, plus Mirror or Flip upside down if needed.
5. Speed & sound. Choose a speed and set the volume. Mute removes the sound completely.
6. Export settings. Choose the format, resolution and quality. The editor shows an estimate of the output.
7. Export. Press Export and wait for the progress bar. The first time, the video engine (about 31 MB) loads and is then cached by your browser. When it's done, press Download.

Which settings should I use?

Where it's going	Crop	Format	Resolution	Quality
TikTok, Reels, Shorts	9:16	MP4	1080p	High or Balanced
Instagram feed post	4:5 or 1:1	MP4	1080p	Balanced
YouTube	16:9	MP4	Original or 1080p	High
WhatsApp or email	Any	MP4	720p	Small file
Website background	Any	WebM	720p	Balanced
Short loop for chat	Any	GIF	480 px wide	n/a

For more on each, see how to crop video for TikTok, Reels and Shorts and how to compress video for WhatsApp and email.

Why is exporting sometimes slow?

When you only trim, the editor can copy the video without re-encoding, which takes seconds and loses no quality; the cut then lands on the nearest keyframe, usually within a second or two of your mark. Any other edit (crop, rotate, speed, resizing, new format) means every frame is re-encoded. That runs on your own processor in a single thread, so a long 4K clip can take several minutes. To speed things up, trim first, pick a lower resolution, and choose the Small file quality.

Is it private?

Yes. Most online editors upload your video to their servers and add a watermark unless you pay. Here, FFmpeg, the same engine many professional tools use, runs inside the web page. Your video stays on your device, which matters for family clips, work recordings and anything personal.

Troubleshooting

• The preview is blank or black. Your browser may not decode that codec. The export usually still works, because FFmpeg reads the file itself.
• "This video has no sound to save as MP3." The clip has no audio track, so there's nothing to extract.
• The tab crashes on a huge file. Close other tabs, trim the clip into shorter parts, or use a computer instead of a phone.
• The cut isn't exact. Re-export with any other change (for example a resolution) so the video is re-encoded on the exact frame, or use Trim Video with frame-exact mode.

When you're ready, open the Video Editor. To just cut the start or end, Trim Video is the quickest option, and Mute Video removes sound in seconds.