Image Resizer: Resize Images Online Free

What does an image resizer do?

An image resizer changes the dimensions of a picture: its width and height in pixels. A photo from a modern phone is often 4032 × 3024 pixels, about 12 megapixels. That is far more than a website, an email or a social post needs. Resizing it to 1600 pixels wide makes the file several times smaller and faster to share, while it still looks sharp on any screen.

Resizing is different from compressing. Compressing keeps the same number of pixels and stores them more efficiently; resizing reduces (or increases) the number of pixels. For the smallest files, do both: resize here, then fine-tune with the image compressor.

Three ways to resize

• Pixels: type a width, a height, or both. With "Keep aspect ratio" on, the image is scaled to fit inside that box without being stretched. Turn it off to get exactly that size, and choose whether to crop the edges, add a background, or stretch.
• Percentage: scale everything by 25%, 50%, 150% and so on. Handy for making a batch of photos smaller by the same amount.
• Presets: one click for common social media and photo sizes. The image is filled and centered, with the edges cropped so nothing looks squashed, or you can choose to fit the whole image on a background.

Everything runs in your browser. Your photos are never uploaded, which is ideal for personal pictures and IDs.

Common image sizes (as of November 2026)

Social networks change their recommendations from time to time, so check the platform's help pages if an upload looks cropped. For official documents, follow the exact rules of the agency: the US State Department, for example, asks for a square digital passport photo between 600 × 600 and 1200 × 1200 pixels, with strict rules on background, lighting and head size that resizing alone cannot fix.

Crop, fit or stretch?

When the new shape is different from the original (say, a landscape photo into a square Instagram post), the tool needs to know what to do with the extra space:

Will resizing reduce quality?

Making an image smaller keeps it sharp. This tool scales in several smooth steps to avoid the jagged edges and moiré patterns that simple resizing can cause.

Making an image larger cannot add detail that was never captured. Enlarging by up to about 150% usually looks acceptable; beyond that, pictures get soft. Start from the largest original you have.

For the output format, Same format keeps JPG as JPG and PNG as PNG. Choose JPG for photos, PNG for graphics and screenshots that need perfect edges or transparency, and WebP for the smallest website images.

Tips

• Websites and blogs: 1200 to 1920 pixels wide is plenty for full-width images.
• Email: 1024 to 1600 pixels wide keeps attachments small.
• Online forms with size limits: resize to around 1200 pixels, then compress.
• Selling online: marketplaces show square product photos; see our guide to product photos with your phone.
• YouTube creators: pair a 1280 × 720 thumbnail with a strong title from our YouTube title generator.
• Need a different format? Use PNG to JPG or HEIC to JPG for iPhone photos.

Privacy: your photos stay on your device

Many online resizers upload your pictures to a server, process them there and keep copies for hours or days. This one does not. The resizing is done by your browser on your own computer or phone, and the new file is created directly on your device. That makes it a good choice for photos of your family, ID documents, passport photos and unreleased product shots. Location data and other camera details stored in the original photo are not copied into the resized file, which is also better for privacy when you post pictures online.

Last updated November 3, 2026.