Online Video Editors

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ClipChamp
Register via Facebook or Google. The program is simple and straightforward. The free version is pretty limited – export video in 480P SD resolution without a watermark, paid access to audio and video library resources.

ClipChamp online video editor features:
video compression and conversion;
transitions, filters, templates, work with text;
basic color correction settings: tone, contrast, brightness;

basic editing features:
rotation, cropping, separation;
different aspect ratios of the canvas;
audio and video library.

Pros:
Different canvas aspect ratios are possible, you can upload existing video or record from a webcam.
Cons: losses in final video quality happen, only for Google Chrome.

Online video cutter
You can use online or as an extension for Chrome. A very simple editor if you want to quickly tweak your video. It works with videos up to 1080P Full HD. Can’t say the functionality is strong, but very easy to use. You can upload up to 500 MB or work with videos uploaded to Google Drive.

Online video editor features
Online video cutter:
uploads to many formats;
You can rotate, cut, trim, crop;

Pros: does not require registration, no watermark, completely free.
Disadvantages: you can’t upload the result directly to YouTube, there are no options for sound editing.

Kizoa
Create funny videos, collages, slideshows to upload to social networks. This editor requires registration. You can also work without it, but you won’t be able to upload videos. The free version limits the video you can upload: no more than 2 minutes, 1 GB of storage, and a watermark when uploading.

Kizoa online video editor options:
Adding keywords to tags when uploading to social networks;
Many tools for video editing and text;
A variety of photo and video templates, a collection of transitions, effects;
ability to work with audio;
audio library with songs suitable for use on YouTube.

Pros: a lot of templates, easy editor for beginners, uploading to social networks.
Disadvantages: Significant limitations in free version, price is comparable to the cost of a full video editor, no timeline.