Image Resizer Online – Free, Custom Dimensions & Perfect for Social Media

Photos from modern phones and cameras are huge — often 3000+ pixels wide, several megabytes in size. That's great for print, but completely unnecessary for a website, an email attachment, or a social media post. Uploading an oversized image usually means the platform resizes it for you automatically, and not always in a way you'd choose yourself — sometimes it crops awkwardly, sometimes it compresses harder than you'd like.

Resizing it yourself first means you control exactly how it looks. You pick the dimensions, keep the framing you want, and avoid any surprise cropping. It's also just faster to upload and load a properly-sized image instead of forcing a platform to do the work every time.

No Photoshop, no installs — just your browser. Here's how to resize an image to specific pixels:

That covers how to change image dimensions in general, whether you're resizing a JPG, PNG, or most other common formats — the process works the same regardless of file type.

• Open the resizer tool.
• Upload your image.
• Choose how you want to resize it — by exact pixel dimensions, by percentage, or by width and height.
• Adjust the values as needed — the tool can lock aspect ratio automatically so nothing gets stretched.
• Download your resized image.

Got a whole folder that needs the same treatment? Here's how to resize multiple images at once:

Handy for prepping a batch of product photos, a folder of blog images, or a set of photos you're about to post across several platforms.

• Upload several images together, instead of one at a time.
• Set your target dimensions or percentage — it applies across the whole batch.
• The tool resizes every image in one pass.
• Download them individually or all together.

This is where a lot of quick resize jobs go wrong, so let's be specific about each concern:

• Losing quality — Resizing down (making an image smaller) doesn't meaningfully hurt quality, since you're working with fewer pixels but still enough detail to look sharp. Resizing up (making a small image bigger) is trickier — you can't add detail that was never captured in the first place, so enlarging a low-resolution image will always look softer than the original. The tool handles downsizing cleanly by default; just don't expect a tiny thumbnail to suddenly look great blown up to a huge size.
• Cropping — Resizing and cropping are different things, and this tool resizes without cropping unless you specifically want it to. Your full image stays intact — nothing gets cut off at the edges.
• Distortion — This happens when width and height get changed independently without keeping the same ratio between them, stretching or squishing the image. Resizing an image while keeping aspect ratio locked avoids this automatically — change one dimension, and the other adjusts proportionally so nothing looks warped.

Every platform has its own preferred dimensions, and posting the wrong size usually means your image gets auto-cropped or squeezed into a shape you didn't intend. Here's a quick reference for common platforms:

To resize for any of these, just enter the target dimensions in the tool the same way you would for a regular resize — there's no separate process, just different numbers depending on where you're posting.

• Instagram — Square posts work best at 1080x1080px. Portrait posts do well at 1080x1350px. For Instagram Stories, go vertical at 1080x1920px, since that's the full-screen ratio.
• Facebook — Standard feed posts look best around 1200x630px. Facebook cover photos are wider, around 820x312px.
• LinkedIn — Feed images work well at 1200x627px, and it's a good size for shared article links too.
• Pinterest — Pins perform best in a tall vertical format, ideally 1000x1500px (a 2:3 ratio).
• TikTok — Since it's video-first, cover images and any static posts should be vertical, 1080x1920px.
• YouTube thumbnails — The standard is 1280x720px, a 16:9 ratio, which matches how thumbnails display across desktop and mobile.

• 100% free, no premium tier
• No signup or account required
• Resize by exact pixels, percentage, or width/height
• Aspect ratio locking to avoid distortion
• Works on any device — desktop, laptop, phone, tablet
• No daily limits or intrusive ads
• Bulk resizing supported for multiple images at once

• Resizing a photo before uploading it to a website that requires specific dimensions
• Prepping images for an Instagram post, Story, or profile photo
• Creating a properly-sized YouTube thumbnail
• Resizing a large photo before attaching it to an email
• Making a batch of product photos consistent in size for an online store
• Shrinking an oversized image so it loads faster on a webpage