Edit AI Videos in the Browser — No Upload, No Credits

Generating clips is the easy part. The moment you have five of them, you need to cut the dead frames, put them in order, lay music underneath and get one file out. That's what the video editor does — and it does it inside your browser.

Why it runs in your browser

Video rendering is slow and heavy. Doing it on a server means queues, timeouts on longer edits, and a cost that has to be passed on to you. Doing it locally removes all three: your clips never leave your machine during the edit, there's no queue, and — the part that matters most — **editing costs no credits at all**. You only spend credits generating the raw material.

The trade-off is honest: the first render downloads the editing engine (about 30 MB, once), and a long sequence takes longer than it would on a big server. For the short clips AI tools produce, it's a good deal.

The workflow, start to finish

1. Add clips — pick them straight from your gallery, or drop in files from your computer.
2. Trim each one by setting a start and end point. Most AI clips have a second of drift you'll want gone.
3. Reorder with the arrows until the sequence tells the story.
4. Add background music and set how loud it sits under the original audio.
5. Render, preview, and download your MP4.

Trim first, always

The single biggest improvement to any AI-generated sequence is cutting the first and last moments of each clip. Generators tend to warm up and drift out. Watch each clip once, note where it's actually good, and set your in and out points there. A tight two seconds beats a loose five every time.

Music changes everything

A silent cut of AI clips feels like a tech demo. The same cut with a bed of music under it feels like a piece. Generate a track with the music tool, add it in the editor and pull the volume down to around a third so it supports rather than competes.

Sound design is the professional touch

Transitions land better with a sound behind them. Describe the sound you want in the studio — “a soft cinematic whoosh followed by a bright confirmation chime” — and drop the result in on the cut.

Add a voice-over

For explainers, write your script, generate the narration with a natural voice, and bring it in as the audio track. Because the voices are multilingual, the same script can carry your video in a dozen markets.

“Generate loosely, then cut tightly. The edit is where AI footage stops looking like AI footage.”— WorkCrafter

A practical first project

1. Generate three short clips around one idea, keeping the style words identical in each prompt.
2. Generate a 30-second instrumental track that matches the mood.
3. Open the editor, add all four, trim each clip to its best two seconds.
4. Drop the music volume to about 35% and render.

That's a finished, publishable short — and everything after the generation step was free.

How to cut a sequence that holds attention

Assembly is not editing. The order and the length of the shots are what decide whether someone watches to the end, and both are decisions you make in the timeline rather than in a prompt.

1. Open on your strongest frame. Whatever clip made you say "that one" is the first one on the timeline.
2. Keep shots short at the start and let them breathe later — attention is cheapest to lose in the first two seconds.
3. Change something on every cut: the subject, the distance, the direction of movement. Two similar shots in a row read as a mistake.
4. Cut on movement rather than after it. A cut that lands mid-gesture disappears; a cut after everything settles feels like a stop.
5. End on a held frame, not a fade. A still last beat is where a caption or a logo belongs.

Audio levels, in numbers

The fastest way to make an edit sound amateur is a music bed that fights the voice. There is no mystery to fixing it — it is one slider and a rule of thumb.

• Music under narration: around 20-35%. You should feel it, not follow it.
• Music with no voice: 60-80%. If it carries the piece, let it.
• Sound effects: loud enough to notice once, never twice.
• Check on phone speakers, not headphones. Most of your audience is on the worst speaker you own.

Export settings that match the platform

The editor exports a standard MP4 at 1280x720, 30fps, which plays everywhere and uploads cleanly. What actually matters is the shape you generated in: a 16:9 clip letterboxed into a vertical feed loses half the screen and most of the impact.

Decide the destination before the first generation, not after the render. Vertical for reels, stories and TikTok; wide for YouTube, sites and presentations; square when a post might appear in both. Re-generating at the right ratio costs credits; re-cropping costs the composition.

Why local rendering is a feature, not a compromise

Everything in the timeline stays on your machine. Nothing is uploaded to render, which means client footage, unreleased product shots and anything under NDA never leave the browser — and there is no queue in front of you at peak hours.

The practical limits follow from the same design. Rendering uses your CPU, so a long sequence takes longer on a laptop than on a workstation, and a very large project is better cut into parts and joined at the end. For the short pieces AI generation actually produces, that ceiling is rarely the thing you hit first.

Frequently asked questions

Does editing use my credits?

No. Credits are spent when you generate images, video, audio or music. Trimming, reordering, adding music and exporting all happen locally and cost nothing.

Why is the first render slow to start?

It downloads the editing engine once (about 30 MB) and keeps it for the session. Subsequent renders start immediately.

What formats can I bring in?

Video and image files from your computer, plus anything already in your WorkCrafter gallery. The export is a standard MP4 that plays anywhere.

Can I edit long videos?

It's built for the short pieces AI tools produce — social clips, ads, explainer segments. A very long sequence will render slowly, so cut it into parts.

Try it

Open the video editor, pull in a couple of clips from your gallery and export something. The whole loop — generate, trim, score, publish — now lives in one place.