> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zevor.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Upscale video

> Boost a video's resolution and sharpness with AI. From 720p to 4K, recovering detail in old clips, compressed exports or low-quality recordings.

Video upscale uses AI to raise a clip's resolution and bring detail
back. It is not a simple pixel stretch: it reconstructs textures, edges
and faces frame by frame.

## What it's for

* Recovering old recordings from a phone or compact camera.
* Bumping a clip exported at low quality (WhatsApp, social, screen
  recorder) up to publishing resolution.
* Pulling sharp stills for thumbnails or screenshots.

## How it works

<Steps>
  <Step title="Upload the video">
    MP4 up to **20 seconds** of source, up to **1080p** input
    resolution. If your video is longer, cut it first.
  </Step>

  <Step title="Pick the factor">
    **2x** (most cases) or **4x** (when you start from low resolution
    and want to land on 4K). Cost scales quadratically because 4x
    renders \~4× the pixels of 2x.
  </Step>

  <Step title="Generate and download">
    The job runs async: leave it queued, we ping you when it's done.
    Download MP4 ready to publish.
  </Step>
</Steps>

## Cost

| Duration × factor | Approx cost |
| ----------------- | ----------- |
| 5 s at 2x         | 30 cr       |
| 10 s at 2x        | 60 cr       |
| 5 s at 4x         | 120 cr      |
| 10 s at 4x        | 240 cr      |

The factor drives the bill: 4x costs 4× a 2x job at the same duration.
If you only need the clip to look good on TikTok or Reels, **2x is
usually enough**.

## Best practices

* Start at **2x**. If you still want more after seeing the result, run
  it again at 4x. You save credits on what was a test.
* Don't mix upscale with aggressive compression. If your source is
  badly compressed, AI recovers what it can, but some detail is
  already lost.
* For long pieces, **chunk first** (10 s max per chunk) and rejoin in
  your editor.

## Limits

* 20 seconds max of source per job.
* 1080p input max (4K input adds nothing and burns more compute).
* MP4 only.

<Note>
  Try it: [zevor.ai/ai-video-upscaler](https://zevor.ai/ai-video-upscaler).
  For a single image, see [Upscale image](https://zevor.ai/ai-image-upscaler).
</Note>