Resize Images Online — Exact Pixels, No Upload

Resize images by percentage, dimensions, or presets.
100% private - your images never leave your device. Free, fast, and secure client-side processing.

Click to upload or drag and drop

PNG, JPG, WEBP, HEIC up to 100MB

Desktop: Drag from anywhere •Mobile: Tap to browse

Quick Instagram Presets

One-click resize to perfect Instagram dimensions. Choose a preset below to instantly resize your image.

Want to learn more? Read our Instagram image sizes guide

Pick a size to crop a photo for Instagram in the Crop tool

Each card opens the cropper with that preset selected. Or upload an image in the tool above to resize it to any of these sizes with one click.

Instagram Post (Square)

1:1 • 1080 × 1080px

FeedPopular

Crop to this size

Instagram Portrait (4:5)

4:5 • 1080 × 1350px

FeedPortrait

Crop to this size

Instagram Portrait (3:4)

3:4 • 1080 × 1440px

FeedPortrait

Crop to this size

Instagram Landscape

1.91:1 • 1080 × 566px

FeedLandscape

Crop to this size

Instagram Story

9:16 • 1080 × 1920px

StoryFull Screen

Crop to this size

Instagram Reel

9:16 • 1080 × 1920px

ReelVideo

Crop to this size

Square Carousel

1:1 • 1080 × 1080px

FeedCarousel

Crop to this size

Profile Picture

1:1 • 320 × 320px

Profile

Crop to this size

How to resize an image

1By Percentage

Scale your image by a percentage (10-100%). Perfect for quickly reducing file size while maintaining proportions. 50% = half the dimensions, ~25% the file size.

2Custom Dimensions

Specify exact width and/or height in pixels. Enable "Maintain aspect ratio" to prevent distortion. Leave one dimension empty to auto-calculate.

3Presets

Choose from common sizes like Instagram (1080×1080), HD (1920×1080), or Thumbnail (150×150). Perfect for social media and platform-specific requirements.

What does the resizer do for you?

Maintain Aspect Ratio

Automatically calculate missing dimensions to prevent image distortion and stretching.

Upscaling Protection

Prevents making images larger by default to avoid quality loss. Can be disabled if needed.

Runs in Your Browser

All resizing happens in your browser using Canvas API. Your images never leave your device.

High-Quality Output

Uses high-quality image smoothing for professional results. Exports at 95% quality by default.

When should you resize an image?

Social Media: Instagram posts (1080×1080), Facebook covers (1200×630), Twitter headers (1200×675)
Profile Pictures: Create thumbnails (150×150) from large photos
Web Optimization: Reduce dimensions to improve page load times
Email Attachments: Resize to medium (1280×720) to meet size limits

Why do image dimensions affect file size?

Resizing is one of the most effective ways to reduce file size. An image straight from a camera might be 4000x3000 pixels, but most websites only display images at a maximum of 1920px width (Full HD) or even less.

By resizing your image to the exact dimensions needed, you remove millions of unnecessary pixels, significantly dropping the file size without any perceived loss in quality for the viewer.

Social Media Image Size Cheat Sheet (2026)

Instagram

Post (Square): 1080 x 1080 px
Post (Portrait 4:5): 1080 x 1350 px
Post (Portrait 3:4): 1080 x 1440 px
Stories / Reels: 1080 x 1920 px

Facebook

Post: 1200 x 630 px
Story: 1080 x 1920 px
Cover: 820 x 312 px

Twitter / X

Post: 1600 x 900 px
Header: 1500 x 500 px
Profile: 400 x 400 px

YouTube

Thumbnail: 1280 x 720 px
Channel Art: 2560 x 1440 px
Profile: 800 x 800 px

Understanding Aspect Ratios

The aspect ratio is the proportional relationship between an image's width and height. Maintaining the correct aspect ratio when resizing is crucial to prevent your images from looking stretched or squashed.

1:1 (Square)

16:9 (Widescreen)

4:3 (Standard Photo)

9:16 (Mobile Story)

Social Media Image Dimensions

Platform	Type	Dimensions	Aspect Ratio
Instagram	Square Post	1080 × 1080 px	1:1
Instagram	Portrait Post	1080 × 1350 px	4:5
Instagram	Portrait Post	1080 × 1440 px	3:4
Instagram	Story	1080 × 1920 px	9:16
Facebook	Post Image	1200 × 630 px	1.91:1
Facebook	Cover Photo	820 × 312 px	2.63:1
Twitter/X	Post Image	1200 × 675 px	16:9
Twitter/X	Header Photo	1500 × 500 px	3:1
LinkedIn	Post Image	1200 × 627 px	1.91:1
YouTube	Thumbnail	1280 × 720 px	16:9
Pinterest	Pin	1000 × 1500 px	2:3

💡 Pro tip: Use "Maintain aspect ratio" when resizing to prevent image distortion. For best results, start with high-resolution images and scale down.

Guides on picking image dimensions

Explore Other Tools

Compress Images

Reduce image file sizes with an adjustable quality setting. Perfect for web optimization.

Convert Format

Convert between JPEG, PNG, WebP, and HEIC formats. Perfect for compatibility.

Crop Images

Crop images with Instagram presets, aspect ratios, and focal point. Perfect for content creators.

Image Resizing FAQ

Common questions about resizing images for social media and web.

Can I resize images without losing quality?

Yes! SnapCompress uses high-quality image smoothing algorithms that preserve visual clarity when resizing. For best results, avoid upscaling (making images larger). Downscaling maintains excellent quality at any size.

What resize methods are available?

Three methods: (1) Percentage scaling for proportional resizing (e.g., 50% = half the dimensions), (2) Custom pixel dimensions for exact width/height, and (3) Presets for common sizes like Instagram, HD, and thumbnails.

How does "Maintain aspect ratio" work?

When enabled, changing one dimension automatically adjusts the other to prevent distortion and stretching. For example, setting width to 1080px on a 1920×1080 image automatically sets height to 608px to maintain the 16:9 ratio.

Can I make images larger?

Yes, but upscaling protection is enabled by default to prevent quality loss. You can disable it if needed. Note that making images larger than their original size will result in reduced quality and pixelation.

What are common dimensions for web and social?

Common targets: HD video 1920×1080, web hero 1600×900, thumbnail 150×150, Twitter header 1500×500, LinkedIn banner 1584×396, YouTube thumbnail 1280×720. For full Instagram guidance see our Instagram Image Sizes guide.

Does resizing reduce file size?

Yes! Resizing to smaller dimensions significantly reduces file size. For example, resizing from 3000×2000 to 1500×1000 reduces file size by approximately 75%. Combine with compression for even greater savings.

Is there a file size limit for resizing?

Files up to 100 MB are supported. All resizing happens in your browser, so nothing is uploaded and there are no server-side upload caps.

How fast is image resizing?

Resizing is nearly instant, taking 1-2 seconds for most images. Since everything happens locally in your browser using Canvas API, there's no upload or download time.

Can I resize multiple images at once?

Currently, SnapCompress resizes one image at a time. You can quickly process multiple images sequentially. Batch resizing is planned for a future release.