Bulk Image Resizer Online Free
Resize JPG, PNG and WebP images with this image resizer online free tool. Change the dimensions in pixels, cm or inches, reduce photos to a KB limit, or resize many images in bulk. Your images stay in your browser and are not uploaded.
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Bulk Resize Images Online for Free
This tool lets you change two important image properties: its dimensions and its file size. Use the image resizer pixels settings to set an exact width and height, scale an image by percentage, or resize by width or height while keeping its original proportions.
You can also use the image resizer in KB mode to meet upload limits such as 20 KB, 50 KB or 100 KB. Whether you need one photo for an application or a batch of product images for a website, the tool provides these options in one place. The tool works directly in your browser, so your photos remain on your device.
How to Resize an Image Online Free in Bulk
- Add your images: Drag JPG, PNG or WebP files into the tool. You can select one image or multiple files for bulk resizing.
- Choose a resize mode: Select Percentage, Dimensions, By Width Only or By Height Only, depending on the result you need.
- Set the dimensions: Enter the width and height in pixels, or switch to cm or inches for print sizes and application forms. Select the required resolution (DPI) when needed.
- Set a file size limit: To use the image resizer to KB limits, choose Under 20 KB, 50 KB, 100 KB or enter a custom target file size.
- Convert your images: Press Convert Images to process your files and view their new dimensions and file sizes.
- Download the results: Save each resized image individually or download all the results together as a ZIP file.
Image Resizer in KB: Resize to 20 KB, 50 KB or 100 KB
Online forms, exam portals, job applications and government websites may require a photo below a specific file size. Use this image resizer online in KB to reduce a JPG or WebP image to a target such as 20 KB, 50 KB or 100 KB.
Choose the required limit under Target File Size. The tool reduces image quality when needed and can also decrease the pixel dimensions if compression alone is not enough. This helps the image fit the requested file size without retaining unnecessarily large dimensions.
For example, this was the result when resizing an iPhone 15 Pro photo originally measuring 3024 × 4032 pixels and 1.23 MB:
| Target file size | Resulting dimensions | Resulting file size |
|---|---|---|
| Under 20 KB | 829 × 1105 px | 19.5 KB |
| Under 50 KB | 1310 × 1747 px | 48.6 KB |
| Under 100 KB | 1853 × 2471 px | 96.4 KB |
| Under 200 KB | 2620 × 3494 px | 194.7 KB |
These results show how a strict KB limit may need to reduce both quality and dimensions to fit a small target. The tool uses 1,000 bytes per KB, so a file below the selected decimal KB limit also stays below the corresponding limit when a form calculates a KB as 1,024 bytes.
If you only need to compress a file without changing its dimensions, try the Image Compressor.
Image Resizer Pixels: Set Exact Width and Height
Use the image resizer pixels option when a website, application form or design template requires specific dimensions. Select Dimensions and enter the required width and height. You can also use the image resizer dimensions settings to fit an image into a target canvas.
The available resize modes work in different ways:
| Resize mode | What it does | Best use |
|---|---|---|
| Percentage | Scales an image by a percentage, from 10% to 100% | Reducing several images proportionally |
| Dimensions | Fits an image within the specified width and height | Forms, product listings and design templates |
| By Width Only | Sets the width and calculates the height proportionally | Images that must fit a page column |
| By Height Only | Sets the height and calculates the width proportionally | Aligning images to the same height |
The image resizer width and height settings do not have to stretch your photos. When the aspect ratio is linked, the original proportions are maintained. Padding can add space around an image to fill the exact canvas size.
For example, resizing a 1600 × 1200 photo to a 1080 × 1080 canvas with padding scales the photo to 1080 × 810 and centres it on the square canvas. With padding disabled and the aspect ratio linked, the result remains 1080 × 810. If you unlink the proportions, the image can stretch and look distorted.
In our test, the iPhone photo resized to a 1080 × 1080 JPG with padding produced a file of 109.5 KB.
Resize a Photo in cm or Inches
Some application forms, identity photo requirements and print shops specify image dimensions in centimetres or inches rather than pixels. The tool supports both units, allowing you to enter the requested physical dimensions and choose a resolution in DPI.
The selected dimensions are converted into pixels using the resolution setting. For example, a width of 2 inches at 300 DPI corresponds to 600 pixels. The tool also writes the selected DPI into JPG output files, which helps specify the intended print size.
| Print size | Pixels at 200 DPI | Pixels at 300 DPI |
|---|---|---|
| 3.5 × 4.5 cm | 276 × 354 | 413 × 531 |
| 2 × 2 inches | 400 × 400 | 600 × 600 |
| 4 × 6 inches | 800 × 1200 | 1200 × 1800 |
| 5 × 7 inches | 1000 × 1400 | 1500 × 2100 |
If a form specifies both physical dimensions and a file size limit, set both before converting. In our test, a 3.5 × 4.5 cm photo at 300 DPI with a 50 KB limit produced a 413 × 531 px JPG of 40.0 KB. At 200 DPI with a 20 KB limit, the result was 276 × 354 px and 18.9 KB.
Use the DPI required by your form or print shop. If no resolution is specified, 300 DPI is a common choice for photo printing. For digital forms that specify only pixel dimensions, follow those dimensions instead.
Image Resizer JPG, PNG and WebP Formats
Choose the output format according to the type of image and where you plan to use it. The image resizer JPG option is suitable for most photographs and online forms. JPG supports adjustable quality, making it useful when you need to reduce an image to a KB limit.
The image resizer PNG option is useful for graphics, sharp edges and images with transparent backgrounds. PNG has no quality setting, so a KB limit works only with JPG or WebP.
WebP is often useful for website images because it can provide smaller files while retaining good visual quality. PNG and WebP preserve transparency, while JPG does not; transparent areas in JPG output are filled with white. DPI information is written into JPG files only.
Image Resizer Bulk: Resize Multiple Images at Once
When you have many photos to prepare, an image resizer bulk workflow can save time. Add multiple images, choose your resize mode, set the dimensions or target file size, and convert them together. The same settings are applied to the selected images.
You can download the results individually or save the entire batch as a ZIP file. In Dimensions mode, padding is useful when images have different original proportions but need to share the same output dimensions. It fills the canvas without stretching the photos.
Common Image Sizes
These are commonly used image dimensions for social media, websites and print. Platform recommendations can change, so check the latest official requirements if an exact size is mandatory.
| Use | Common dimensions |
|---|---|
| Instagram square post | 1080 × 1080 px |
| Instagram portrait post | 1080 × 1350 px |
| Instagram, Facebook or WhatsApp Story | 1080 × 1920 px |
| Facebook and many social link previews | 1200 × 630 px |
| YouTube thumbnail | 1280 × 720 px |
| Full HD screen or slide | 1920 × 1080 px |
| A4 page at 300 DPI | 2480 × 3508 px |
To check the existing resolution and print information of a photo, use the Image DPI Checker.
Can You Make an Image Bigger?
You can enlarge an image by entering dimensions greater than its original size in Dimensions, By Width Only or By Height Only mode. However, increasing the dimensions does not create new image details. The original pixels are spread across a larger area, which can make the result appear softer or less sharp.
For better results, start with the highest-resolution original available and resize it down when possible. If your goal is to improve the apparent detail of a small or blurry photo, a dedicated upscaling tool may be more suitable than resizing.
Image Resizer or Image Compressor?
Use this tool when you need to change width, height, pixel dimensions, physical print size or a combination of dimensions and file size. It is especially useful when an application asks for a photo with exact dimensions and a maximum KB limit.
Use the Image Compressor when you mainly want to reduce file size without changing the image dimensions. If you need to remove unwanted edges or make a photo fit a particular shape, use the Image Cropper. For ready-made social media dimensions, try the Social Media Image Resizer.
Frequently Asked Questions
How do I use the image resizer in KB?
Add your image, select a limit such as Under 50 KB in Target File Size, and press Convert Images. JPG is a useful starting format for photos. If quality reduction alone is insufficient, the tool may also reduce the pixel dimensions to meet the target.
How do I resize a photo to 20 KB?
Choose Under 20 KB in Target File Size and convert the image. In our test, a 3024 × 4032 iPhone photo was reduced to 829 × 1105 pixels and 19.5 KB. Cropping unnecessary areas before resizing may help preserve more detail in the part of the photo you need.
How do I change the pixel size of an image?
Choose Dimensions, By Width Only or By Height Only, enter your desired pixel measurements and press Convert Images. Keep the aspect ratio linked to preserve the original shape, or enable padding when you need an exact canvas size without stretching the image.
Can I resize an image in cm and KB at the same time?
Yes. Select cm as the unit, enter the width and height, choose the resolution and set a target file size. In our test, a 3.5 × 4.5 cm image at 300 DPI with a 50 KB limit produced a 413 × 531 px JPG of 40.0 KB.
How do I convert cm or inches with the image resizer into pixels?
Choose cm or Inches as the unit, type the width and height, and pick the Resolution. The tool multiplies the size in inches by the DPI, so 3.5 cm at 300 DPI becomes 413 pixels and 2 inches at 300 DPI becomes 600 pixels. The result appears under the size fields before you convert.
What resolution (DPI) should I choose?
Use the resolution requested by the application form or print shop. If none is specified, 300 DPI is common for photo printing. When working with pixel dimensions for websites, DPI usually does not change the number of pixels; in this tool, it is written into JPG output files.
Can I resize an image in KB without losing quality?
Not completely. Reducing a file to a strict KB limit usually requires removing image data through compression, reducing dimensions, or both. Very small limits such as 20 KB may cause visible softening, while larger limits such as 100 KB or 200 KB can preserve more detail. Start with the original image rather than a previously compressed copy.
Is an online image resizer safe to use?
Privacy depends on how each tool processes images. This tool processes your files in your browser instead of uploading them to a server. That can be useful when resizing personal photos or documents. Avoid using online tools that upload sensitive images unless you understand their privacy practices.
How do I resize multiple images at once?
Add all your images, select one resize mode and choose your output settings. Press Convert Images to process the batch, then download the files individually or together as a ZIP. This is useful when several images need consistent dimensions or file sizes.
Will resizing reduce image quality?
Reducing dimensions removes pixels, while compression can remove image information to lower the file size. High-quality resampling helps images look clean at their new dimensions, but enlarging a photo cannot restore detail that was not present in the original.
What happens to transparent backgrounds?
PNG and WebP can retain transparency. JPG cannot, so transparent areas are filled with white. When using Dimensions mode with padding, you can choose the background fill colour.
Does the resizer keep EXIF data such as location and camera details?
No. The browser redraws the image, and the resulting files contain the image pixels rather than the original camera metadata. GPS location, camera settings and other EXIF details are not retained. Keep the original file if you need that metadata later.