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AI Image Upscaler

Free to startCommercial use OKNo watermark

Drag & drop your image here

Click here to browse your image

or click to browse

PNGJPGWEBP
Advanced options
~2,000 tokens · FLUX.2 Klein · 1024×1024 square · balanced detail

Add resolution and detail to small or low-quality images.

What upscaling gives you

Rescue a small image

A thumbnail saved years ago, a screenshot, an avatar off an old profile — redrawn at up to 1792px on the long edge instead of stretched into mush.

Rebuild the detail, not just the pixels

Edges, fabric, brickwork and lettering are reconstructed as the picture is redrawn, which is the difference between an upscale and a resize.

Sharp, not oversharpened

Detail level sits under Advanced options: Gentle leaves grain alone and skips halos, Crisp pushes edges hard. Most upscalers give you one look — here you choose it.

How to Use AI Image Upscaler

1

Upload the small or soft image

A thumbnail, a screenshot, an old export — drop it above or click to browse. No account, no watermark

2

Choose the output size

1792 pixels on the long edge is the largest the models return; pick the shape that matches your image so nothing is cropped

3

Click "Upscale"

Detail is rebuilt as the picture is redrawn at the new size. Download it, or try again with a different detail level

Use this tool via API

Call this tool straight from your own scripts. The endpoint follows the OpenAI REST format and signs requests with a bearer token, so client libraries you already use keep working. You are billed the same token rate as the web app.

API DocumentationGet API Key
curl
curl -X POST https://api.rewind.ai/v1/images/edits \
  -H "Authorization: Bearer sk-rewind-..." \
  -F [email protected] \
  -F prompt="Upscale this image to higher resolution. Restore lost detail, sharpen edges, but do not change the composition or subject." \
  -F model="black-forest-labs/flux.2-klein-4b" \
  -F size=1024x1024

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AI Image Upscaler FAQ

You choose: the Output size select is the size the result comes back at, and the largest it offers is 1792 pixels on the long edge. So a 400×300 thumbnail comes back several times wider, while a photo that is already larger than the size you pick comes back at that size — pick the biggest option for those. What the tool adds beyond pixels is DETAIL: edges, texture and structure are redrawn rather than stretched, which is why a small image stops looking soft.

AI Image Upscaler on Rewind.ai is a free AI tool. There's no charge and no sign up needed to start.

Yes. You get 2,500 free tokens per day to use AI Image Upscaler and every other tool on Rewind.ai. A free account raises that to 5,000 tokens/day. Token packs start at $5.

AI Image Upscaler sends your request to an AI model and shows the result on the page. Some models run on our own GPUs, others through their providers.

No. You can use AI Image Upscaler right away without signing up. A free account doubles your daily usage to 5,000 tokens and saves your history.

Anonymous users get 2,500 tokens/day. Free accounts get 5,000 tokens/day. Tokens reset every 24 hours. Each generation costs ~100-5,000 tokens depending on the operation.

We don't sell your data or use it to train models, and we delete it on request.

In most cases, yes. What you generate is yours to use, and commercial use follows our Terms and the license of the model that made it. Don't use other people's likeness or copyrighted material without permission.

AI Image Upscaler lets you start on free daily tokens and pay only when you need more, with token packs from $5 or a monthly plan.

AI Image Upscaler uses the model shown in its model picker, or Rewind's default model for the task when the page has no picker. We update to newer models as they ship.

Yes. AI Image Upscaler works in any mobile browser, and the layout adapts to your screen size.

Sign up for a free account to get 5,000 tokens/day, double the anonymous limit. Or buy token packs starting at $5 for 200,000 tokens. See /pricing/ for all options.

Yes. After you generate content, you can download it, copy it, or share it via a unique link. Signed-in users can also view their generation history.

Sign up free for 10,000 tokens

Higher daily limits, and your generations saved to your account.

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