Nothing is uploaded
Resizing happens inside your browser. That makes it safe for ID photos, signatures and personal documents.
Free · No upload · Works on phone and desktop
Image Resizer: Resize Photos to Exact Pixels, cm or KB
Resize any photo in seconds. This free image resizer changes width and height in pixels, percent or print size, and can shrink files under a KB limit such as 20 KB or 50 KB for online forms. Your images never leave your device.
- Pixels, percent or cm
- Target size in KB
- Batch resize with ZIP
- 100% private
1. Add images
Keep aspect ratio is on. Enter a width or height and the other side is calculated.
Every image keeps its proportions.
When proportions differ
Crop position
3. Output
KB
Add at least one image to start.
Resized images
Why it is different
Why this image resizer is better
Most resizers upload your photo to a server, split every KB target into a separate page and give you one download at a time. This tool does it all in one place, privately.
Hit any KB limit
Set a maximum such as 20 KB or 50 KB. The tool finds the highest quality that fits and trims dimensions only if it has to.
Pixels, percent or print size
Work in px, %, cm, mm or inches with DPI. JPG files keep the DPI you choose, which helps with print and photo forms.
Crop, pad, blur or stretch
Choose what happens when the shape changes, and pick which part of the photo to keep when cropping. Nothing gets squashed unless you want it to.
Batch resize with ZIP
Resize up to 30 images with the same settings, then save them one by one or all together in a single ZIP file.
Sharper downscaling
Large reductions are done in several smaller steps. This keeps edges and text cleaner than a single jump.
How to use
How to resize an image online
It takes four quick steps, and you can repeat them with new settings as often as you like.
Add your images
Drag photos onto the upload box, browse your device or paste with Ctrl+V. You can add up to 30 at once.
Pick the new size
Choose a preset, or enter pixels, a percentage or a print size in cm, mm or inches.
Set format and file size
Keep the original format or switch to JPG, PNG or WebP. Turn on the KB limit if a website caps file size.
Resize and download
Press Resize images, check the before and after sizes, then download each file or the full ZIP.
Presets
Common image sizes for social media, web and documents
Every size below is available in the preset menu, so you can resize an image for a platform with one click.
| Use | Size | Aspect ratio |
|---|---|---|
| Instagram square post | 1080 × 1080 px | 1:1 |
| Instagram portrait post | 1080 × 1350 px | 4:5 |
| Story, Reel or Short | 1080 × 1920 px | 9:16 |
| YouTube thumbnail | 1280 × 720 px | 16:9 |
| LinkedIn banner | 1584 × 396 px | 4:1 |
| X (Twitter) header | 1500 × 500 px | 3:1 |
| Blog or link share image | 1200 × 630 px | 1.91:1 |
| Passport photo (35 × 45 mm) | 413 × 531 px at 300 DPI | 7:9 |
| US passport or visa (2 × 2 in) | 600 × 600 px at 300 DPI | 1:1 |
Platforms update their recommendations from time to time, so check the latest guidance for important campaigns.
File size
How to resize an image to 20KB, 50KB or 100KB
Job portals, exam forms and government websites often set strict limits for photos and signatures. Here is how to meet them first time.
Steps for a KB limit
- Read the portal's rules first. Most list both pixel size and file size.
- Enter the required width and height, or pick a print size preset.
- Turn on Limit file size and enter the maximum, such as 50 KB.
- Choose JPG output. It gives the smallest files for photos.
- Resize, then check the result before you upload it.
Why dimensions sometimes shrink
The tool first lowers JPG quality step by step to fit your limit. If the file is still too large at low quality, it reduces the pixel size slightly and tries again. A badge on the result tells you when this happened.
For tiny limits such as 10 KB or 20 KB, a smaller starting size looks better than heavy compression. A 200 × 230 px photo usually fits easily.
Online forms
Photo and signature resizer for online forms
Exam, job and government portals usually ask for a photo and a signature in fixed pixel sizes and KB ranges. The Online forms presets set the size, JPG format and KB limit in one click.
| Upload | Typical size | Typical file size | Preset to use |
|---|---|---|---|
| Passport-style photo | 200 × 230 px or 3.5 × 4.5 cm | 20 KB to 50 KB | Form photo, or Photo 35 × 45 mm |
| Signature | 140 × 60 px | 10 KB to 20 KB | Signature |
| Thumb impression | 240 × 240 px | 20 KB to 50 KB | Thumb impression |
| Scanned document or certificate | A4 at 100 to 150 DPI | 100 KB to 300 KB | Print size with a KB limit |
These are common ranges only. Every portal sets its own rules, so always follow the exact size and KB limits in the official notice.
How to resize a signature to 20KB
- Sign in black or dark blue ink on plain white paper.
- Photograph or scan it, then add it to the image resizer.
- Pick the Signature preset, or enter the size your form asks for.
- Keep Crop to fill and set the crop position so the whole signature stays in the frame.
- Press Resize images and upload the JPG.
If the form rejects your photo
- File too large: lower the KB limit by 5 KB and resize again.
- File too small: some portals set a minimum. Turn off the limit, raise quality or use a slightly larger pixel size.
- Wrong dimensions: switch off the aspect-ratio lock and enter the exact width and height.
- Wrong format: choose JPG output, because most portals accept only .jpg or .jpeg.
Benefits
Benefits of resizing images before you upload
Right-sized images save time for you and for everyone who opens them.
- Faster websites. Smaller images load quicker and improve Core Web Vitals.
- No rejected uploads. Forms accept files that meet their size limits.
- Sharper social posts. Platforms compress less when your image already fits.
- Smaller emails. Attachments stay under mailbox limits.
- Less storage. Your phone, drive and backups fill up more slowly.
Pixels, DPI and centimetres explained
Screens use pixels. Printers use physical size and dots per inch (DPI). To convert a print size into pixels, divide by 2.54 and multiply by the DPI.
Pixels = cm ÷ 2.54 × DPI
Width: 3.5 cm ÷ 2.54 × 300 = 413 px
Height: 4.5 cm ÷ 2.54 × 300 = 531 px
Passport photo at 300 DPI = 413 × 531 px
FAQ
Image resizer FAQs
Is this image resizer free and private?
Yes. The image resizer is free, needs no sign-up and adds no watermark. Your photos are processed inside your browser and are never uploaded to a server.
How do I resize an image to 50KB?
Add your image, turn on Limit file size and enter 50, or tap the 50 KB button. Then press Resize images. The tool lowers JPG quality step by step and reduces the dimensions only if it needs to.
Does resizing reduce image quality?
Making an image smaller keeps detail well, because large reductions are done in several steps. Making an image larger cannot add detail, so it looks softer beyond about 150%. Very small KB limits also add visible compression.
How do I resize a photo for a passport or visa application?
Choose a passport preset, or select Print size and enter the size, for example 35 × 45 mm at 300 DPI. Keep Crop to fill selected so the photo is not stretched. Always follow the official rules for size, background and file size.
What is the difference between resizing and compressing an image?
Resizing changes the width and height in pixels. Compressing keeps the dimensions and reduces the file size by encoding the image more efficiently. To shrink files without changing dimensions, use our image compressor.
Can I resize multiple images at once?
Yes. Add up to 30 images and they are all resized with the same settings. You can then download each one or save them all in a single ZIP file.
How do I resize a photo and signature for an online form?
Choose the Form photo or Signature preset under Online forms. It sets the pixel size, JPG format and a KB limit in one step. Then press Resize images. Check the portal's notice first, because every form sets its own size and KB range.
Can I resize an image in cm and KB at the same time?
Yes. Select Print size, enter the size in cm or mm with the DPI, then turn on Limit file size and enter the KB value. The photo is resized to the exact print size first and then compressed to fit the limit.
Which image formats are supported?
You can resize JPG, PNG, WebP, GIF and BMP files, plus AVIF where your browser supports it. Safari can also open HEIC photos. Results can be saved as JPG, PNG or WebP.
How do I resize an image without changing its proportions?
Keep the link button switched on and type only a width or a height. The other side is calculated for you. You can also resize by percent, which always keeps the original proportions.
Resize your first image now
Drop in a photo, choose a size or a KB limit and download the result in seconds. It is free, private and works on any device.
Open the image resizer