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Resize / Upscale Image

Resize images to exact dimensions or upscale them 2×, 3×, or 4× with high-quality interpolation.

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or click browse / paste (Ctrl+V). PNG, JPG, WEBP up to 20MB (1 image at a time)
JPG PNG WEBP Up to 20 MB
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✦ FREE ONLINE TOOL

Free Online Image
Resizer & Upscaler

CleanCutBG's resize tool changes the pixel dimensions of your image in two directions: downsizing large photos to fit strict upload limits, or upscaling small images 2×, 3×, or 4× for larger prints and displays. Both directions use LANCZOS, a high-quality interpolation algorithm that preserves sharpness far better than the default resamplers built into Windows or Preview.

The resizing engine runs server-side and delivers results instantly — no app to download, no registration. Feed it JPG, PNG, WebP, or HEIC files up to 20 MB each, and process one image at a time. JPG, PNG, and WebP are supported; HEIC files should be converted to one of these formats before uploading.

Image resizing and upscaling illustration
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When to resize an image

Get the right dimensions for every purpose — from web and social media to print and uploads.

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Optimize 12 MP Phone Photos

Resize to fit web and digital platforms without losing quality.

◫
Social Media Dimensions

Instagram Feed & Story, YouTube thumbnail, LinkedIn banner, Facebook cover, X header.

▣
Print at Specific DPI

Prepare photos for print, e.g., 4×6 inch at 300 DPI = 1200×1800 pixels.

▧
Upscale Logos, Icons & Scanned Photos

Enhance small images by 2×, 3×, or 4× for better clarity and detail.

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Standardize Gallery Dimensions

Keep all images the same width or height for a clean, professional look.

☁
Fit Upload Limits

Meet size limits for job portals, government forms, and school application sites.

▷
Create Thumbnails

Make thumbnails for email, presentations, and catalogues.

Resize Smarter.
Do More.
✦ QUICK GUIDE

Resize images in 3 simple steps

Get the perfect dimensions without losing quality.

01

Upload your image

Upload an image illustration

PNG, JPG or WebP  •  Up to 20 MB

02

Choose your dimensions

03

Export & download

Exported image previewOutput format
PNGJPGWebP
⇩   Download
⌗

Keep aspect ratioYour image stays perfectly
proportioned.

↗

Upscale up to 4×Get larger, sharper images
with ease.

▤

Choose your formatPNG, JPG or WebP —
perfect for any use.

ⓘTip: Set width or height to 0 to automatically preserve the original aspect ratio.

✣   Resize Tool Guide

Aspect Ratio, Pixels & DPI:
What They Actually Mean

Resizing sounds simple, but three related concepts trip people up.
Understanding them once makes every image tool easier for the rest of your life.

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Pixels

Pixels are the raw dots that make up a digital image. A 4032 × 3024 photo has 4032 dots across and 3024 dots down.

▧Example:
4032 × 3024 pixels
⌗

Aspect Ratio

The aspect ratio is the shape, width divided by height. 4032 ÷ 3024 is 4:3 (traditional camera). 1920 : 1080 is 16:9 (widescreen). 1080 : 1080 is 1:1 (square). Change both width and height freely and you'll stretch the image; keep the ratio to preserve it.

▭4:3(Traditional)▭16:9(Widescreen)□1:1(Square)
▤

DPI

DPI (dots per inch) only matters when you're printing. It tells the printer how densely to pack the pixels on paper.

A 1200 × 1800 pixel image printed at 300 DPI comes out at exactly 4 × 6 inches. The same file printed at 150 DPI comes out at 8 × 12 inches, same pixels, bigger print, half the sharpness.

▧Example:
1200 × 1800 px @ 300 DPI = 4 × 6 in
1200 × 1800 px @ 150 DPI = 8 × 12 in
♧

Our resize tool works purely in pixels. To preserve aspect ratio, set only the width or the height and leave the other at 0,
we'll calculate it for you.

≋
✦   Pro Tips

When Upscaling Helps
and When It Doesn't

Upscaling multiplies the pixel count of a small image. It's genuinely useful in some situations
and a waste of time in others. Here's the honest breakdown:

▣

Works well

Enlarging small logos, icons, or vector-style graphics to fit a larger canvas. LANCZOS keeps clean edges sharp without adding noise.

⌕

Works well

Bumping a 640×480 scan of an old photo to 1920×1440 for viewing on a modern screen, the extra pixels look smoother than nearest-neighbour zoom.

▤

Doesn't add detail

Upscaling can never invent detail that isn't in the original. A blurry photo will stay blurry, just bigger. For real detail recovery, use our Enhance tool with sharpness first.

▧

Bad for photos

with heavy JPEG compression. The blocky artifacts get enlarged along with the image. Compress-heavy Instagram exports often look worse when upscaled.

♧

LANCZOS is the industry-standard high-quality resampling filter, used by Photoshop, GIMP,
and every major image library. It's slower than bilinear or bicubic but gives noticeably crisper
results, especially on sharp edges and text.

✦ Pro Tips

Tips for Perfect Resizing

Get the best results every time with these simple but important tips.
They'll help you resize your images without losing quality and keep
your results sharp, clear and professional.

Small Tips
Make a Big
Difference
↙01

Always resize
before compressing

Shrinking pixel count is the single biggest way to reduce file size, before you even touch the quality slider.

▤02

Keep your original file

Every resize loses a tiny bit of detail, you can't get it back by resizing up again. Always keep an untouched original file.

▱03

Use exact dimensions

For social media, use the exact platform-recommended dimensions to avoid compression artifacts and keep your images looking sharp.

◉04

Set to 0 (auto-calc)

When printing photos, always set the width or height to 0 so the ratio stays locked. This keeps your image from looking stretched or squashed.

▧05

Print at the right DPI

For photos, multiply the print size by your target DPI. A 5×7 inch photo at 300 DPI needs at least 1500×2100 pixels.

✧06

Use Enhance tool
after upscaling

After heavy upscaling (3× or 4×), run the Enhance tool and add a little sharpness to compensate for softness.

♧

Remember: These tips help you get the best quality and sharpness, whether you're resizing for
web, social media, printing, or any other use.

⌁

Resizing Questions & Answers

Will resizing lose quality?
Downsizing is essentially lossless, you're throwing away pixels, not distorting them. Upscaling can only invent pixels through interpolation; it won't add real detail but LANCZOS keeps the result smooth.
How do I keep the aspect ratio when resizing?
Enter only the width you want and leave the height as 0, or vice versa. The tool will calculate the missing dimension from the original ratio.
Can I upscale beyond 4×?
Not with this tool. Beyond 4×, standard interpolation stops looking natural, you'd need AI super-resolution, which is a separate technique. For most needs, 2× or 3× hits the useful ceiling.
Is this image resizer free?
Yes, completely free. Resize one image at a time as many times as you need. No sign-up, no output branding.
Does it work with HEIC iPhone photos?
No. Convert HEIC to JPG, PNG, or WebP before uploading; those are the formats accepted by this tool.
Will you store my resized images?
No. The resize operation is stateless — your image is loaded into memory, resampled with LANCZOS interpolation, and the result is sent back. Both the input and output are released from memory immediately. We don't retain filenames, don't log image contents, and have no database to store anything in.
Does it work on mobile?
Yes. The interface adapts to touch screens — tap to upload, type dimensions, and download. Works in Safari, Chrome, and any modern mobile browser.

Spotted a bug in Resize / Upscale Image?

Email [email protected] with a screenshot, the steps to reproduce, and your browser/device info. Feature requests and feedback go to the same address.

Your upload is processed for the requested edit and is not used as a public example. For storage details, read our privacy policy.