Resize Images in Pixels, CM, MM or Inches
Resize images to an exact size in pixels, centimetres, millimetres or inches — pick a resolution from 72 to 600 DPI and the output carries it. Or use Crop & Select to cut a frame at an exact physical size.
What is Image Resizer?
Image Resizer is a free online tool that changes the dimensions of your JPG, PNG, and WebP images. You can resize a photo to an exact pixel width and height, set it in centimetres, millimetres or inches at the resolution of your choice, or scale it up or down by a percentage, and you can process one image or a whole batch at once. It runs in your browser with nothing to install, and it is free to use with no account required.
Sizing in physical units is what makes it useful away from the screen. A pixel has no real-world size on its own — it only becomes a centimetre once a resolution is attached — so the unit selector is paired with a DPI setting from 72 to 600, and the exact pixel result is shown before you commit. Ask for 3.5 × 4.5 cm at 300 DPI and you get 413 × 531 pixels, and that resolution is written into the file's density metadata so Word, Photoshop and a print shop all open it at the size you meant. One-tap presets cover A4, A5, A3, Letter, 4 × 6 in, 5 × 7 in and the common passport and stamp sizes.
The core benefit is precision and speed without the overhead of heavy software. Instead of opening a large photo editor just to make a picture smaller, you upload your file, set the size you need, and download the result in seconds. When you resize an image online free of charge here, you get exactly the dimensions you asked for, whether that means fitting a strict upload requirement or shrinking a large photo so it loads faster on a website.
It also differs from manual resizing in convenience. Desktop programs can do the same job, but they take time to launch, often cost money, and tie you to one machine. This tool works the same way on any modern browser across Windows, macOS, Linux, Android, and iOS, so you can change image size online from a laptop or a phone with the same steps and no watermark added to the finished file.
Because it supports bulk resizing, you can hand it a group of images that all need the same treatment and let it handle them together. That saves a lot of repetitive clicking when you are preparing product photos, gallery thumbnails, or a folder of pictures that must match a single size.
When should you use Image Resizer?
- You need to resize a photo to a specific size to meet an upload limit for a job application, passport form, or government portal.
- A form asks for a photo in centimetres — 3.5 × 4.5 cm or 2 × 2.5 cm — rather than in pixels.
- You are preparing an image to print at A4, A5 or 4 × 6 inches and it must come out at 300 DPI.
- A website or blog image is too large and slows down page loading, so you want to scale it down.
- You are preparing product photos for an online store and every image must share the same dimensions.
- A social media profile or cover photo needs exact pixel dimensions to display correctly.
- You have a folder of images that all need the same width and want to bulk resize them in one pass.
- You want to shrink a high-resolution picture before emailing it so it fits within an attachment size.
- You need matching thumbnails for a gallery, portfolio, or presentation.
- You are on a phone or tablet without photo software and still need to change image size online quickly.
Benefits of using Image Resizer
Completely free, no sign-up
The tool is 100% free forever with no account, login, email, or payment ever required. Just open the page and start resizing.
Private by design
Your file is processed on a secure server and deleted automatically right after processing. Nothing is stored, logged, or shared.
Exact or percentage sizing
Set a precise pixel width and height, or scale by a percentage to keep proportions simple. You get the dimensions you asked for.
Centimetres, millimetres and inches
Size an image the way a form or a printer describes it, at 72 to 600 DPI, with the pixel equivalent shown live and the resolution written into the output file.
Bulk resizing
Resize many images to the same size in a single batch instead of repeating the process one file at a time.
No watermark
The resized image comes back clean with no watermark added, so it is ready to use anywhere.
Works on any device
Runs in any modern browser on desktop, tablet, and mobile with nothing to install, so you can resize an image from wherever you are.
How to use Image Resizer
- 1
Upload your image
Open the Image Resizer and select the JPG, PNG, or WebP file you want to change. To bulk resize, add several images at once.
- 2
Choose your resize method
Pick exact dimensions by entering a width and height, or choose to scale the image by a percentage.
- 3
Pick your unit and resolution
Switch between pixels, centimetres, millimetres and inches. For a physical unit, choose a DPI — 300 for print, 96 for screen — and the pixel equivalent appears below the fields.
- 4
Enter your target size
Type the width and height you need, tap a preset such as A4 or 3.5 × 4.5 cm, or set the percentage to scale up or down.
- 5
Resize the image
Start the process and let the tool apply your settings. Batches are handled together in the same run.
- 6
Download the result
Save the resized image to your device. Your uploaded file is deleted automatically right after processing.
Common problems & how to fix them
Enlarging a small image stretches the existing pixels, which softens detail. For sharp results, start from a higher-resolution original or scale down rather than up.
This happens when the new width and height do not match the original aspect ratio. Use the percentage option or keep the same proportion between width and height to avoid distortion.
This tool works with JPG, PNG, and WebP. If your image is in another format, convert it to one of these first, then resize it.
Reducing pixel dimensions usually lowers file size, but very detailed images can stay large. Try a smaller width and height, or save from a JPG source for a lighter file.
Use the bulk option and set one target width and height so all files come out matching, rather than resizing each image separately.
Nothing is stored on the server, so simply upload the original again and enter the correct size. Keep a copy of your original before resizing.
Image Resizer vs other tools
Here is how DocsSeva Image Resizer compares to other free online tools and desktop photo software when you just need to change an image size.
| Feature | DocsSeva | Other tools |
|---|---|---|
| Price | 100% free forever | Free tiers or paid licenses |
| Sign-up required | Never | Often required |
| Watermark | None added | Sometimes added |
| File handling | Deleted right after processing | May be stored or logged |
| Batch processing | Bulk resizing included | Often limited or premium |
| Installation | None, runs in browser | Desktop software needs install |
Whether you need to shrink a large photo for a website, meet a strict upload requirement, or prepare a whole folder of pictures at once, this tool makes it simple to resize an image online free of charge. Set an exact pixel width and height to resize a photo to a specific size, resize an image in cm, mm or inches at 72 to 600 DPI when a form or a printer describes it that way, or scale image online free by percentage to keep things proportional. When you need to change image size online across many files, the built-in bulk image resizer handles them together in a single pass. It works in any modern browser on desktop, tablet, and mobile, with no account, no sign-up, no watermark, and nothing to install. Your file is processed on a secure server and deleted automatically right after processing, so your images stay private. Open the Image Resizer now, upload your picture, choose your size, and download the result in seconds.