Cut and trim
Tighten a rambling clip to the moments that matter. Say the length or the parts to keep.
AI Video Editor
Attach a video, say what to change, and Krater's AI agent edits it for real - cuts, merges, titles, captions. Download the finished file.
Real edits, not suggestions
The agent works on your actual file with real video tools, in a sandboxed environment.
Merge clips
Stitch multiple videos into one file with clean cuts between segments.
Captions and subtitles
It transcribes the audio itself and burns readable captions into the video.
Title cards and text
Add opening titles, lower thirds and end cards without touching an editor.
Reformat and resize
Turn a landscape clip vertical for Shorts and Reels, crop, scale or pad to any ratio.
Audio fixes
Extract audio, normalize loudness, or lay music under the existing track.
Three steps to an edited video
Attach, describe, download. That is the whole workflow.
Attach your video
Drop the file into chat like any attachment - phone footage, screen recordings, b-roll.
Describe the edit
Say it in plain words: cut it to 15 seconds, add a title card, put captions on.
Get the file back
The agent runs real video tools in its sandbox and hands you the edited file to download.
Watch a real edit we ran
We attached a clip and told the agent to cut it to 15 seconds with a title card. This is the actual file it returned.
15-second highlight
Cut, assembled and title-carded by the agent
ffprobe + ffmpeg
The real tools, run in its own sandbox
Under 4 credits
This edit. Heavy jobs run around 300
Edits you can copy and paste
Attach a clip, paste one of these, and the agent does the rest. Always end with "give me the finished file" so it executes instead of planning.
The golden rule: describe the finished video you want, never the steps. The agent figures out the tools.
Cut it down
"Edit this video: cut it to a 15 second highlight clip with a simple title card at the start. Do the edit yourself and give me the finished file."
Burn in captions
"Add burned-in captions to this video - readable, centered, bottom third. Do the edit yourself and give me the finished file."
Make it vertical
"Reformat this video to 9:16 vertical for Reels and Shorts, keeping the subject centered. Do the edit yourself and give me the finished file."
Merge clips
"Merge these clips into one video in the order I attached them, with a clean cut between each. Do the edit yourself and give me the finished file."
Fix the audio
"Extract the audio from this video, remove background noise and normalize the volume, then give me back the video with the cleaned audio. Do it yourself."
Find the moment
"Watch this video and pull the single most interesting 10 seconds as a standalone clip with captions. Do the edit yourself and give me the finished file."
Turn it into a one-word skill
On Krater you can save this as a skill - a reusable editing assistant you call by name.
From then on: attach a clip, invoke the skill, say the cut. New users get the same result without writing the prompt twice.
Vs. the usual AI video tools
Most "AI editors" give you a timeline with AI features - you still do the cutting. Krater is the only one where the AI performs the whole edit.
Krater
The agent - you describe, it edits
Descript
You, by deleting transcript words
CapCut
You, with AI assists
OpusClip
AI cuts highlights, you approve
Premiere Pro
You, with Firefly features
AI video editing, in short
What is the Krater AI video editor?
It is the Krater agent applied to video editing. You attach a video and describe the edit, and the agent performs it using real video tools inside its sandboxed computer, then returns the finished file.
Can it really edit my video, or does it just advise?
It really edits. In our own test we attached a 30 second clip, asked for a tighter edit, and the agent produced a finished video file - no timeline, no manual cutting. It is not an AI that tells you how to edit; it does the edit.
How much does an edit cost?
Edits are billed in credits against your plan. A straightforward short-clip edit cost about 300 credits in our test. Plans start at $20/month - check the live estimate on your plan before running a long job.
Is there a free AI video editor?
CapCut is the strongest free manual editor with AI features. For agent editing where the AI does the whole job, Krater plans start at $9/month with credits included.
Can it add subtitles automatically?
Yes - the agent transcribes the audio track itself and can burn the captions into the video or output them as a separate file.
Is this the same as AI video generation?
No - this edits video you already have. To generate brand-new clips from a prompt or a photo, use the video generator on our features page. Both live in the same workspace.
What can it handle?
Common formats like MP4, MOV and WebM, and typical edits: cutting, merging, resizing, text overlays, captions, audio extraction and normalization. It is best for practical, fast edits rather than frame-perfect color grading or heavy motion graphics.
What can it NOT do?
Frame-perfect color grading, complex motion graphics and feature-length multicam work still belong to a human in Premiere or DaVinci. It is built for practical edits: cuts, merges, captions, titles, reformatting and audio.