Resize images
Resize image: enter a new width or height – the tool calculates the other side for you. Ready-made presets cover Instagram, YouTube and websites. Everything happens in your browser.
Source: ITU-T T.81 / ISO/IEC 10918-1 – JPEG. Updated: .
How it is calculated
An image’s size in pixels determines how much detail it holds – and how big the file is. A phone photo of 4000 × 3000 pixels has 12 megapixels; for a website or a social media post, a width of 1080 to 1920 pixels is usually enough. Resizing saves storage, speeds up web pages and meets the requirements of platforms and upload forms.
How it works
- Drag in or choose your images (up to 20 at once – all get the same new size).
- Pixels: enter a new width or height – the other side follows the aspect ratio. Percent: e.g. 50% for half the width and height.
- Or choose a preset, such as 1080 × 1350 for an Instagram portrait post.
- Download – one by one or all as a ZIP.
Width and height at once: fit, fill or stretch?
If the photo’s aspect ratio doesn’t match the target (e.g. a 4:3 photo for a square 1:1 format), there are three options:
- Fill and crop: the image fills the whole format and overhanging edges are cropped from the center – ideal for social media.
- Fit: the whole image stays visible; it is scaled to fit inside the frame (one side ends up smaller than entered).
- Stretch: the image is forced to the exact size and distorted – rarely useful.
Common image sizes
| Use | Pixels | Aspect ratio |
|---|---|---|
| Instagram post, square | 1080 × 1080 | 1:1 |
| Instagram post, portrait | 1080 × 1350 | 4:5 |
| Story, Reels, TikTok | 1080 × 1920 | 9:16 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| Link preview (Open Graph) | 1200 × 630 | 1.91:1 |
| Full HD / 4K | 1920 × 1080 / 3840 × 2160 | 16:9 |
Size in inches or centimeters for print
For print, resolution in dpi (dots per inch) matters. Pixels needed = inches × dpi (or centimeters ÷ 2.54 × dpi). Example: a 4 × 6 in photo at 300 dpi needs 1200 × 1800 pixels. Enter these values as width and height.
Quality when shrinking and enlarging
For big reductions the tool halves the image step by step – that gives cleaner edges than a single scaling step. Enlarging can’t invent detail: a small image gets bigger, not sharper. With “Never enlarge”, smaller images stay as they are.
Privacy
Your images are not uploaded. Your browser’s canvas API does the scaling, right on your device.
More image tools: cut the file size with the image compressor, pick a section with crop image, switch formats with the image converter, and look up the right dimensions in social media image sizes.
Frequently asked questions
How do I resize an image without distorting it?
Keep “Keep aspect ratio” switched on and enter only the width or only the height – the other side is calculated to match.
Can I resize several images at once?
Yes, up to 20 images of up to 50 MB each. They all get the same settings and can be downloaded together as a ZIP.
Which file format do I get?
By default the same as the original (HEIC becomes JPG). Under “Output format” you can also choose JPG, PNG or WebP.
How many pixels do I need for a print?
Pixels = inches × dpi. For a 5 × 7 in print at 300 dpi you need 1500 × 2100 pixels.
Does shrinking make the image blurry?
No – shrinking keeps it sharp because several pixels are combined into one. Images get blurry when enlarged beyond their original size.
What happens to EXIF data?
It is removed when saving (including GPS data). The orientation is applied first, so the image stays the right way up.
Are my images stored anywhere?
No. Everything runs locally in your browser; nothing is uploaded or stored on a server.
What size should an image be for Instagram?
Instagram displays posts 1080 pixels wide: square 1080 × 1080 px, portrait 1080 × 1350 px (4:5) or up to 1080 × 1440 px (3:4). Pick the Instagram preset or type the dimensions; all formats are listed in social media image sizes.
Sources and legal basis
- ITU-T T.81 / ISO/IEC 10918-1 – JPEG
- W3C – Portable Network Graphics (PNG) Specification
- Google for Developers – An image format for the Web (WebP)
- AOMedia – AV1 Image File Format (AVIF)
- MDN – Image file type and format guide
- MDN – HTMLCanvasElement.toBlob()
- Open-source licenses of the libraries used (MIT, LGPL-3.0)
As of: · Editorial policy
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