Image Resizer
Resize images by dimensions or percentage — fast, free, and private. Runs in your browser — the file is never uploaded.
Settings
Aspect ratio locked
Common sizes
Picking a preset unlocks the aspect ratio, since these are exact sizes
Output: —
Original
—
Resized
—
How to Use the Image Resizer
- Upload or drag-and-drop your image onto the dropzone.
- Choose Dimensions mode to set exact pixel width/height, or Scale % to resize proportionally.
- Toggle the lock icon to maintain or release the aspect ratio.
- Select your desired output format (JPG, PNG, or WebP) and quality level.
- Click Resize Image and preview the result side-by-side.
- Click Download to save the resized image.
All processing happens in your browser — your images are never uploaded to any server.
What is an Image Resizer?
An image resizer changes the width and height of an image without needing design software. With Webkitters Image Resizer, you can resize JPG, PNG, and WebP images by exact pixel dimensions or by percentage — directly in your browser, with no file upload required.
This is useful when you need smaller images for websites, social media profiles, email attachments, thumbnails, or documentation.
When Should You Resize an Image?
- The image is too large for a web form or email attachment
- A website or app requires a specific width and height (e.g. 1200×630 for Open Graph)
- You want faster page loading by reducing image dimensions
- You need consistent dimensions across a gallery or blog
- A platform rejects uploads above a certain pixel size
Resize by Pixels vs Percentage
By Pixels
Use when you know the exact size you need — for example 800×600 px for a product image or 400×400 px for a profile photo.
By Percentage
Use when you want to scale an image proportionally — for example reducing to 50% to halve both dimensions while keeping the aspect ratio.
Image sizes for social media and the web
Every size below is a button in the tool above — pick one and the width and height are filled in for you. Upload the right dimensions and the platform leaves your image alone; upload the wrong ones and it crops or re-compresses to fit, which is where the mushy results come from.
| Where | Size | Ratio |
|---|---|---|
| Instagram post | 1080 × 1080 | 1:1 |
| Instagram story | 1080 × 1920 | 9:16 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| Open Graph | 1200 × 630 | 40:21 |
| Facebook post | 1200 × 630 | 40:21 |
| X / Twitter post | 1600 × 900 | 16:9 |
| LinkedIn banner | 1584 × 396 | 4:1 |
| WhatsApp profile | 500 × 500 | 1:1 |
| Favicon | 512 × 512 | 1:1 |
Ratios are computed from the dimensions rather than typed in, so the two columns cannot drift apart. Platforms do revise these occasionally — check the official spec if something looks off.
Resizing versus compressing
Resizing changes how many pixels the image has. Compressing changes how many bytes are spent describing them. Which one you need depends on what is actually wrong.
If the dimensions are already right and the file is merely too heavy — an upload form refusing it, an email bouncing — resizing is the wrong lever and will cost you detail you did not need to lose. Use the Image Compressor instead; it can search for a quality that lands under a specific KB budget.
If the image is far larger than the slot it is going into, resize first and compress second. Halving the width removes three quarters of the pixels before the encoder starts, which beats crushing quality on a full-size original every time.
Specifications
- Accepts
- Any image
- Gives you
- .jpg, .png, .webp download
- Where it runs
- Your browser — the file is never uploaded
- Sign-up
- None
- Cost
- Free, with no usage limits
FAQ
Are my images uploaded to a server?
No. Your image is processed entirely in your browser using the Canvas API. No data is sent to any server.
What image formats are supported?
The tool supports JPG, PNG, WebP, GIF, and BMP images.
Does resizing reduce image quality?
Enlarging an image beyond its original size can reduce sharpness. Reducing size generally preserves quality well. Use the quality slider to control compression.
Can I keep the aspect ratio?
Yes. Enable the aspect ratio lock to resize proportionally — changing one dimension automatically adjusts the other.
What is the maximum image size?
There is no strict limit — processing is done in your browser, so it depends on your device memory. Most images up to 20 MB work fine.