# Upscale Image Online

> To upscale an image online, open Kenerate's image upscaler, add the picture and pick a size: Real-ESRGAN enlarges and sharpens in one pass, Image Upscaler outputs 2K, 4K or 8K, and Kenerate Upscale hits an exact size up to 128 MP. It takes 15–80 seconds, new accounts get 25 free credits, and there is no watermark.

URL: https://kenerateai.com/upscale-image
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 26 September 2026

## Key facts
- 2× / 4×: 2× = 4× the pixels · 4× = 16×
- 4K: Image Upscaler, any input size
- Biggest: 8K, or up to 128 MP
- Time: About 15–80 seconds

## Steps
1. Open the upscaler and add your image — Go to kenerateai.com/app/tool/image-upscale and upload a JPG, PNG or WEBP up to 25 MB.
2. Choose how big — Real-ESRGAN enlarges and sharpens in one pass. For a set size pick Image Upscaler → 2K, 4K or 8K, or Kenerate Upscale → 4 to 128 megapixels; the tool shows the exact pixel size your image will come out at.
3. Run it and compare — Press Upscale. After 15–80 seconds drag the slider to compare the result with the original.
4. Download — Download PNG, JPG or WEBP with no watermark, or open it in Edit Studio.

## In depth

### Social media
Official sizes from the platforms' help centres:
- YouTube thumbnails — now 3840 × 2160 recommended (2160 × 3840 for Shorts), at least 640 px wide, 16:9 [1].
- LinkedIn — profile photo 400 × 400 up to 7680 × 4320 px; background 1584 × 396 px; 8 MB max [2].
- Facebook Page — profile picture 320 × 320 px or larger; cover at least 400 × 150, loading fastest at 851 × 315 [3].

### Online stores
Amazon prefers over 1,000 px on the longest side so shoppers can zoom [4]; Shopify says 2048 × 2048 px usually displays best for square images [5]. A 4K upscale clears both.

### Prints
Photo labs publish their own minimums. Walgreens asks for 300 DPI and lists 540 × 360 px as the minimum for a 4×6 print and 5400 × 3600 px for a 24×36 poster [6]; Shutterfly recommends 1600 × 1200 px for 8×10 and 2400 × 3600 px for 24×36 [7]. At the classic 300 PPI, a 4×6 is 1200 × 1800 px and an 8×10 is 2400 × 3000 px — pick Kenerate Upscale and a megapixel size to hit those exactly.

### Upscale once, from the best copy
Each round of resizing and JPEG saving adds damage. Real-ESRGAN was trained on exactly that kind of repeated degradation [8], but it still works best on the largest, least-compressed copy you have — upscale once to the final size rather than in several steps.

References:
[1] YouTube Help — Add video thumbnails: https://support.google.com/youtube/answer/72431
[2] LinkedIn Help — Profile and background photo sizes: https://www.linkedin.com/help/linkedin/answer/a549049
[3] Facebook Help — Page profile and cover photo sizes: https://www.facebook.com/help/125379114252045
[4] Amazon Seller Forums — product image size guidance: https://sellercentral.amazon.com/seller-forums/discussions/t/4b3c4c39-6f8c-4312-aa0e-99982eb8f5e1
[5] Shopify Help — Product media types and sizes: https://help.shopify.com/en/manual/products/product-media/product-media-types
[6] Walgreens Developer — Image requirements: https://developer.walgreens.com/support/image-requirements
[7] Shutterfly — Uploading photos guide: https://support.shutterfly.com/s/article/uploading-photos-guide
[8] Wang et al. — Real-ESRGAN (ICCV Workshops 2021): https://arxiv.org/abs/2107.10833

## FAQ
Q: How do I upscale an image for free?
A: Open the Kenerate image upscaler, add your picture and run the default Real-ESRGAN engine. New accounts get 25 free credits to test, and bigger jobs use one-time credit packs that never expire. There is no watermark.

Q: How do I upscale an image to 4K?
A: Choose the Image Upscaler engine and pick 4K. It outputs 4K whatever the input size. In our test a 480 px landscape came out at 5461 × 3072 pixels.

Q: What does 2× or 4× upscaling mean?
A: 2× doubles the width and the height, so the image has 4 times as many pixels; 4× makes it 4 times wider and taller, 16 times the pixels. A 500 × 500 image is 1000 × 1000 at 2× and 2000 × 2000 at 4×.

Q: Will upscaling make a blurry image sharp?
A: It helps with softness from a small size or compression. For a photo that is out of focus or shaken, use Phota Enhance, which is built to repair blur, grain and old-photo damage.

Q: How do I upscale an image in Photoshop?
A: Open the photo in Camera Raw, right-click it, choose Enhance and tick Super Resolution — that doubles the width and height. For any other size use Image → Image Size with Resample on.

Q: How many pixels do I need to print?
A: About 300 pixels per inch for a sharp print: 1200 × 1800 px for a 4×6 in photo, 2400 × 3000 px for 8×10 in, and 2480 × 3508 px for A4.

Q: Can I upscale several images at once?
A: The upscaler processes one image per run. Every result is saved in your history, so you can run several in a row and download them later.

Q: Does upscaling reduce quality?
A: An AI upscale adds pixels without the blur of a normal resize, so it usually looks better, not worse. Upscaling an already large image gives little benefit — the tool warns you if the size you pick is smaller than your image.

## Related pages
- AI image upscaler: https://kenerateai.com/ai-image-upscaler
- AI image enhancer: https://kenerateai.com/ai-image-enhancer
- Upscale image to 4K: https://kenerateai.com/upscale-image-to-4k
- Increase image resolution: https://kenerateai.com/increase-image-resolution
- HD photo converter: https://kenerateai.com/hd-photo-converter
- Unblur image: https://kenerateai.com/unblur-image
- Sharpen image: https://kenerateai.com/sharpen-image
- Unpixelate image: https://kenerateai.com/unpixelate-image
- Photo restoration: https://kenerateai.com/photo-restoration
- Uncensored image enhancer: https://kenerateai.com/enhance-ai
- Enhance AI art: https://kenerateai.com/enhance-ai-art
- Anime upscaler: https://kenerateai.com/anime-upscaler
- Bulk image upscaler: https://kenerateai.com/bulk-image-upscaler
- Remove glare from photo: https://kenerateai.com/remove-glare-from-photo
- Restore old photos: https://kenerateai.com/how-to-restore-old-photos
- Best photo restoration software: https://kenerateai.com/best-photo-restoration-software
- Denoise photos: https://kenerateai.com/how-to-denoise-photos
- Increase image resolution: https://kenerateai.com/how-to-increase-resolution-of-an-image
- Sharpen an image in Photoshop: https://kenerateai.com/how-to-sharpen-an-image-in-photoshop
- All upscaler alternatives: https://kenerateai.com/image-upscaler-alternatives
- Remini alternative: https://kenerateai.com/remini-alternative
- Let's Enhance alternative: https://kenerateai.com/lets-enhance-alternative
- upscale.media alternative: https://kenerateai.com/upscale-media-alternative
- Upscayl online: https://kenerateai.com/upscayl-online
- Bigjpg alternative: https://kenerateai.com/bigjpg-alternative
- VanceAI alternative: https://kenerateai.com/vanceai-alternative
- waifu2x alternative: https://kenerateai.com/waifu2x-alternative
- Magnific AI alternative: https://kenerateai.com/magnific-ai-alternative
- Topaz Labs alternative: https://kenerateai.com/alternatives/topazlabs-alternative

## Sources
- Adobe — Super Resolution in Camera Raw: https://helpx.adobe.com/camera-raw/using/enhance.html
- Adobe — Resampling options in Photoshop: https://helpx.adobe.com/photoshop/desktop/crop-resize-transform/resize-adjust-resolution/resampling-options.html