What image formats are supported?

You can upload any format your browser supports — typically JPEG, PNG, WebP, GIF, BMP, and SVG. The output is always a high-quality PNG file.

What social media image sizes are supported?

Built-in presets include LinkedIn (Profile 400×400, Banner 1584×396, Post 1200×627), Instagram (Square 1080×1080, Portrait 1080×1350, Story 1080×1920), X/Twitter (Post 1600×900, Profile 400×400, Header 1500×500), Facebook (Post 1200×630, Cover 820×312, Story 1080×1920), YouTube (Thumbnail 1280×720, Channel Art 2560×1440), and web formats (OG image 1200×630, Favicons, App icon 512×512).

How does the aspect ratio lock work?

When the aspect ratio is locked, entering a width automatically calculates the corresponding height (and vice versa) based on your original image proportions, preventing any distortion.

Is this tool really free?

Yes, completely free with no sign-up, no watermarks, and no usage limits. Use it as many times as you need.

🖼️ Free Online Image Resizer

Resize and crop images instantly for social media, websites, and apps. Runs entirely in your browser — your images never leave your device.

Resize Settings

Width (px)

Height (px)

Lock aspect ratio

Scale (%)

Scales relative to original image dimensions.

Preview

📁

Drop an image here or click to upload

Resize Images Online — Free, Fast, and Private

Whether you need a perfectly sized LinkedIn banner, an Instagram story, a YouTube thumbnail, or a custom dimension for your website, this free image resizer handles it all directly in your web browser. No sign-up required, no watermarks added, no file size limits imposed, and no data ever sent to any server. Your photos stay on your device from start to finish.

Unlike other online image resizers that require you to upload files to remote servers, our tool uses the HTML5 Canvas API to process everything locally. This means faster results, better privacy, and the ability to work offline once the page has loaded.

How to Resize an Image Online

Resizing images with this tool takes just three simple steps:

Step 1: Upload your image — Drag and drop any image onto the upload area, or click to browse your files. Supported formats include JPEG, PNG, WebP, GIF, BMP, TIFF, and SVG.
Step 2: Choose your target size — Use one of three methods: enter exact pixel dimensions (By Size tab), scale by a percentage (Percentage tab), or select a ready-made social media preset (Social Media tab).
Step 3: Preview and download — The preview updates in real-time as you adjust settings. When you're satisfied, click "Download PNG" to save the resized image to your device instantly.

Three Ways to Resize Your Images

Different situations call for different approaches. Our tool gives you flexibility with three resize modes:

By Size (Custom Pixel Dimensions) — Enter exact width and height values in pixels. Enable "Lock aspect ratio" to automatically calculate one dimension based on the other, preventing distortion. Perfect for web developers who need precise image dimensions for responsive layouts.
Percentage Scaling — Reduce your image to any percentage between 1% and 100% of its original size. Both width and height scale proportionally, maintaining the original aspect ratio. Ideal for quickly reducing file weight for email attachments or faster page loads.
Social Media Presets — Select from a comprehensive library of pre-configured sizes for every major social platform. No more googling "what size is a LinkedIn banner?" — just pick the preset and download.

Key Features

🔒 100% Private & Secure

Your images are processed locally using the HTML5 Canvas API. Nothing is uploaded to any server. Works offline once loaded.

⚡ Instant Real-Time Processing

No waiting for server responses. Resizing happens in milliseconds right in your browser with a live preview.

📱 Works on All Devices

Fully responsive design works on desktop, laptop, tablet, and mobile. No app installation required.

🎯 Smart Cover-Fit Cropping

Intelligently fills target dimensions while keeping the subject centered. No awkward stretching or empty borders.

📐 Aspect Ratio Lock

Automatically calculates width or height to maintain original proportions. Prevents distortion when entering custom sizes.

🆓 Completely Free Forever

No sign-up, no watermarks, no usage limits, no premium tiers. Use it as many times as you need, always free.

Complete Social Media Image Size Guide (2024–2025)

Keeping up with the correct image dimensions for each social media platform can be confusing. Here's a comprehensive reference table with all the sizes supported by our tool:

Platform	Type	Dimensions (px)
LinkedIn	Profile photo	400 × 400
LinkedIn	Banner / Cover	1584 × 396
LinkedIn	Post image	1200 × 627
Instagram	Square post	1080 × 1080
Instagram	Portrait post	1080 × 1350
Instagram	Story / Reel	1080 × 1920
X (Twitter)	Post image	1600 × 900
X (Twitter)	Profile photo	400 × 400
X (Twitter)	Header	1500 × 500
Facebook	Post image	1200 × 630
Facebook	Cover photo	820 × 312
Facebook	Story	1080 × 1920
YouTube	Thumbnail	1280 × 720
YouTube	Channel art	2560 × 1440
Web / Dev	OG image (link previews)	1200 × 630
Web / Dev	Favicon (standard)	16 × 16 / 32 × 32
Web / Dev	Apple touch icon	180 × 180
Web / Dev	App icon	512 × 512

When to Use an Image Resizer

Properly sized images matter more than most people realize. Here are common scenarios where this tool saves you time:

Social media marketing — Each platform has strict recommended dimensions. Images that don't match get cropped unpredictably or appear pixelated. Using the correct size ensures your content looks professional.
Website performance — Oversized images slow down page load times, hurt SEO rankings, and waste bandwidth. Resizing images to the exact display size can reduce file weight by 60–90%.
Email campaigns — Large image attachments bounce or get flagged as spam. Resizing to appropriate dimensions keeps your emails deliverable and fast-loading.
App development — Generating correctly sized app icons, splash screens, and assets across different device densities.
E-commerce — Product images need consistent dimensions for a clean grid layout. Resize all product photos to a uniform size for a polished storefront.
Presentations and documents — Insert images that fit your slide layouts without manual cropping in PowerPoint or Google Slides.

Why Client-Side Processing Matters

Most image resize tools upload your photos to their servers for processing. This raises privacy concerns, especially for sensitive or proprietary images. Our approach is fundamentally different:

No data transmission — Your image bytes never leave your device. The browser reads the file, processes it with the Canvas API, and generates the output entirely in local memory.
No account required — Since we don't store anything, there's no need for user accounts, logins, or data retention policies.
Works offline — Once the page is loaded, you can disconnect from the internet and continue resizing images indefinitely.
No rate limits — Process as many images as you want without hitting daily quotas or being asked to upgrade to a paid plan.

Tips for Best Results

Start with the highest resolution source — Scaling down preserves quality; scaling up creates blur. Always begin with the largest version of your image.
Use aspect ratio lock for custom sizes — This prevents accidental distortion. If you need a different aspect ratio, uncheck the lock and both dimensions become independent.
Check the live preview — The preview updates instantly as you change settings, so you can see exactly how the crop will look before downloading.
Use percentage scaling for batch consistency — If you need to reduce multiple images by the same factor, the percentage mode ensures proportional results every time.

Frequently Asked Questions

Is my image uploaded to a server?

No. All processing happens locally in your browser using JavaScript and the HTML5 Canvas API. Your images never leave your device. We don't collect, store, or transmit any image data.

What image formats can I upload?

You can upload any format your browser supports — typically JPEG, PNG, WebP, GIF, BMP, TIFF, and SVG. The output is always downloaded as a high-quality PNG file to preserve transparency and detail.

Can I resize images on my phone or tablet?

Yes. The tool is fully responsive and works on any modern mobile browser including Safari on iOS and Chrome on Android. The interface adapts to smaller screens automatically.

Is there a file size limit?

There is no artificial limit. Since processing is local, the only constraint is your device's available memory. Most images up to 50 MB resize without issues on modern devices.

How does the smart cropping work?

When the target aspect ratio differs from your source image, the tool uses a "cover-fit" algorithm. It scales the image to fill the entire target area, then centers the result and trims the overflow. This ensures no empty borders and keeps the main subject visible.

Can I resize to dimensions larger than my original image?

Technically yes, but enlarging images beyond their original resolution introduces blur and pixelation. For best results, always resize down from a higher-resolution source.

What's the difference between this and Photoshop or Canva?

This tool is purpose-built for fast, single-image resizing without needing software installation, account creation, or subscription fees. For complex editing (layers, filters, text), dedicated tools like Photoshop or Canva are better suited. For quick resizing, this is faster and more private.

Do you add watermarks to resized images?

Never. The output is your original image resized to the specified dimensions with zero modifications, watermarks, or metadata injection.