What Is a Video Editor and How Do You Edit a Video?

A video editor is two things: the software you use to assemble raw footage into a finished file, and the person (or role) doing that work. You need one when you have clips, audio, or images that must be trimmed, ordered, captioned, or resized before publishing. The right choice depends on your device, how much control you want, and whether you'd rather edit manually or let AI handle repetitive steps. Kapwing, for example, is a browser-based editor that combines manual tools with AI-assisted ones, so it fits creators who want to work without installing desktop software.

The core tasks every video editor handles

Whatever tool you pick, editing comes down to a small set of operations. Kapwing's tool list maps closely to these:

Trimming and arranging — cutting dead space and putting clips in order. Kapwing's Trim with Transcript lets you edit by editing text, and Smart Cut removes silences automatically.
Combining tracks — laying video, audio, and overlays on a timeline.
Captions and subtitles — the Subtitler adds captions in the browser; Transcribe Video turns speech into text.
Audio work — the Audio Editor records, edits, and cleans audio; Clean Audio removes background noise; Text to Speech generates voiceovers.
Resizing — Resize Video changes dimensions for different platforms; Speaker Focus auto-resizes to keep speakers framed.
Effects and generation — B-Roll Generator creates supporting footage, and the Video Generator builds a project from a prompt.

If a tool covers trimming, captions, audio cleanup, and export, it can handle most first projects. Everything else is a bonus.

Browser-based vs. desktop vs. AI-assisted editors

These aren't mutually exclusive, but they suit different situations.

Type	Best when	Trade-offs to check
Browser-based (e.g., Kapwing)	You switch devices, collaborate, or don't want installs	Depends on internet speed and browser performance
Desktop software	You need heavy effects, long timelines, or offline work	Requires installation and often more powerful hardware
AI-assisted	You want speed on scripts, captions, dubbing, or B-roll	Output still needs review; AI won't match a manual edit for every creative choice

Kapwing sits across the browser-based and AI-assisted categories: it runs in the browser and layers AI tools (Script Generator, Dubbing into 40+ languages, Character Consistency, Video Generator) on top of standard editing. That combination is useful when your bottleneck is time rather than creative control.

How to choose an editor for your goal

Work through these questions in order:

What device will you edit on? If you move between a laptop and a shared computer, browser-based tools avoid installs. If you edit long projects offline, desktop may be better.
What's the output? Social clips need fast resizing and captions. Training or instructional videos need screen recording and clear audio. Kapwing lists solutions for marketing, training, and schools, which signals where its tools are aimed.
How much do you want to do by hand? If you'd rather type a prompt and refine, prioritize AI tools. If you want frame-level control, prioritize timeline features.
Do you need translation or dubbing? Kapwing supports dubbing into 40+ languages and video translation, which matters if you're localizing content.
Check pricing before committing. Kapwing has a pricing page, but the source material doesn't state specific plan costs or whether features are free — verify current terms there rather than assuming.

A simple first-edit workflow

This sequence works in most editors, including Kapwing:

Import your footage. Upload clips, audio, and images into the project.
Trim and order. Remove unusable sections and arrange clips into a rough sequence. In Kapwing, you can do this by editing the transcript.
Clean the audio. Remove background noise and level the sound before adding music.
Add captions. Run the Subtitler or Transcribe Video, then correct any errors.
Add visuals. Insert B-roll, effects, or text overlays where they support the story.
Resize for your platform. Use Resize Video or Speaker Focus to fit the target format.
Export and review. Watch the exported file end to end before publishing.

Expected result: a single finished file with clean audio, readable captions, and correct dimensions.

Common problems and how to fix them

Wrong aspect ratio — a horizontal edit posted vertically gets cropped or letterboxed. Resize before export, not after.
Captions out of sync — auto-captions drift when audio is edited after captioning. Caption last, or re-run captions after audio changes.
Muddy audio — background noise survives basic trimming. Run noise removal (Kapwing's Clean Audio) before adding music.
Export fails or takes long — usually file size, resolution, or connection. Browser editors depend on your internet; try a shorter segment or lower resolution.
Format won't play on the target platform — check the platform's accepted formats before export rather than converting afterward.

Where to start

If you're new and want one place to try trimming, captions, audio cleanup, resizing, and AI generation together, a browser-based editor like Kapwing covers the full first-project workflow. Start with a short clip, run through the seven steps above, and only add AI tools once the manual basics feel comfortable. Check Kapwing's pricing page for current plan details before you rely on any specific feature for ongoing work.