About the Image Resizer
Tezmy's Image Resizer changes the width and height of any photo or picture in seconds. Type exact pixel sizes with proportions locked, scale by a percentage, or choose a ready-made size for Instagram posts and stories, YouTube thumbnails, Facebook covers and more. When the new shape is different from the original, the image is centred and cropped neatly instead of being squashed. You can also save the result as JPG, PNG or WebP. All of this happens in your browser, so your photos stay private.
Updated October 2026
How to use the Image Resizer
- 1Click Select image, or drop an image on the page.
- 2Choose Pixels, Percent or Social sizes.
- 3Enter the new size, or pick a preset.
- 4Click Resize and download your new image.
Three ways to resize
- Pixels: type the exact width and height. Keep the lock on to change one side and have the other follow, so the photo never looks stretched.
- Percent: make the whole image, say, 50% of its size. Quick for shrinking big phone photos before emailing them.
- Social sizes: one tap for common sizes such as an Instagram post (1080 × 1080), Instagram story (1080 × 1920), YouTube thumbnail (1280 × 720), Facebook cover (820 × 312) and a 600 × 600 passport-style photo.
Resizing for online forms and applications
Exam, job and visa websites often ask for a photo or signature with exact dimensions, such as 600 × 600 pixels, and a maximum file size. Resize to the exact dimensions here first. If the file is then still over the size limit (for example 50 KB or 100 KB), open it in Compress Image and lower the quality until it fits.
The 600 × 600 px preset matches the digital photo size used for US passport and visa photos (2 × 2 inches). Other countries have their own rules, so always check the official requirements for background, head size and dimensions.
What happens when the shape changes
If you pick a size with a different shape than your photo, for example a square from a wide landscape picture, the image is centred and the extra edges are cropped neatly instead of squashing everything. To choose exactly which part stays, crop it first with Crop Image, then resize.
Resize photos on iPhone and Android
Open this page in Safari or Chrome and tap Select image to pick a photo from your gallery. Choose the new size, then save the result as JPG, PNG or WebP. Everything happens on your phone, so your pictures are never uploaded. If you want a new file type, use Image Converter, and when a picture goes in a PDF use JPG to PDF.
Features
- Resize by exact pixels
- Lock proportions or crop to fill
- Scale by percent
- Instagram, YouTube and Facebook sizes
- Save as JPG, PNG or WebP
- Private: images never leave your device
Frequently asked questions
How do I resize an image without stretching it?
Keep “Keep proportions” ticked. When you change the width, the height updates automatically so the picture keeps its shape.
What happens if I pick a size with a different shape?
The image is centred and cropped to fill the new size exactly, so nothing gets squashed or stretched. Only the edges that don't fit are trimmed.
What size is an Instagram post?
A square Instagram post is 1080 × 1080 pixels, and a story or reel cover is 1080 × 1920. Both are available as presets under Social sizes.
Can I make an image bigger?
Yes, up to 200% with Percent or any size with Pixels. Enlarging can't add detail, so very large increases may look soft.
Are my photos uploaded?
No. Resizing happens in your browser and your photos never leave your device.
How do I resize an image to 600 × 600 pixels?
Choose Pixels, turn off the proportion lock and type 600 and 600, or tap the passport photo size under Social sizes. The picture is centred and cropped so it isn't stretched.
How do I reduce an image's size in KB?
Resizing to fewer pixels makes the file smaller. For a strict limit like 100 KB, resize first, then use Compress Image to lower the quality until it fits.
What size is an Instagram portrait post?
1080 × 1350 pixels (a 4:5 shape). Type these numbers in Pixels mode, or crop to 4:5 with Crop Image first.