Resize Images Instantly — Free, Private & Online
The most secure, privacy-first image resizer. Resize JPG, PNG, WebP & GIF entirely in your browser using HTML5 Canvas. No images are sent to any server — your photos never leave your device, and you can verify it in your browser's DevTools Network tab.
Upload an image
Drag & drop your images here
or click to browse · paste with Ctrl+V · multiple files supported
Image editor
Drag the slider to compare
How to Resize an Image Online
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Upload your image
Drag & drop, click to browse, or paste from clipboard with Ctrl+V.
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Set target dimensions
Enter width & height in pixels, or use the percentage slider. Toggle aspect ratio lock to prevent distortion.
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Download your image
Pick output format (JPG, PNG, WebP), set quality, then click Download — done!
Why Choose Resizo?
100% Private
All processing happens in your browser. Images are never uploaded to any server.
Instant & Fast
No waiting for uploads or server processing. Results appear in milliseconds using the Canvas API.
Bulk Resize
Resize multiple images at once and download them all as a ZIP file in one click.
Quality Control
Fine-tune output quality with a slider. Preview before/after with the built-in comparison tool.
Works on Mobile
Fully responsive, works on any smartphone or tablet — no app installation required.
Format Conversion
Input JPG, PNG, WebP, or GIF. Export as JPG, PNG, or WebP — with full format conversion.
Work with many images at once
Process hundreds of images in a single run — all in your browser. Download results as a ZIP.
More Free Image Tools
Standard Image Sizes for Every Platform
Use Resizo to resize your images to the exact pixel dimensions required by each platform.
- Post (Square)1080 × 1080 px
- Portrait Post1080 × 1350 px
- Portrait 3:41080 × 1440 px
- Story / Reel1080 × 1920 px
- Thumbnail1280 × 720 px
- Channel Art2560 × 1440 px
- Profile Picture800 × 800 px
- Cover Photo851 × 315 px
- Post Image1200 × 630 px
- Profile Picture320 × 320 px
- Post Image1200 × 675 px
- Header Photo1500 × 500 px
- Profile Picture400 × 400 px
- Post Image1200 × 627 px
- Cover Photo1584 × 396 px
- Profile Picture400 × 400 px
- Profile Photo640 × 640 px
- Shared Image (max)1600 × 900 px
- Status Image1080 × 1920 px
From the Blog
View All ArticlesPrivacy & Security
Never Upload Private Photos to Random Resizers
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Privacy-First Image Editing With No Upload
A practical guide to no-upload image editing with local browser workflows, settings, and mistakes to avoid.
Resizo vs iLoveIMG: Privacy and Speed Compared
Compare Resizo and iLoveIMG for privacy, speed, limits, pricing, and everyday image workflows.
Resizo vs TinyPNG: Local vs Cloud Compression
A practical Resizo vs TinyPNG comparison covering compression, no-upload privacy, limits, and output control.
Compression & Resizing
Batch Image Toolkit for Web-Ready Assets
Six free batch tools for resizing, converting, compressing, renaming, cropping, and watermarking images locally.
Reduce Photo File Size Without Ugly Compression
Reduce photos from MB to KB using practical resizing, format, and quality settings that preserve useful detail.
Resize an Image Without Losing Quality
A practical guide to sharp resizing: dimensions, aspect ratio, export format, and quality settings.
Compress PNG Without Losing Quality
Compress PNG files with practical lossless settings, transparency advice, and when-to-convert WebP guidance.
Fast Bulk Resize for Web With No Uploads
A fast no-upload workflow for resizing large image folders into consistent web-ready files.
Social Media
Social Media Image Sizes 2026
Complete guide to image sizes for Instagram, YouTube, Facebook, TikTok, LinkedIn & WhatsApp in 2026.
How to Resize Image for Instagram Perfectly
Resize your images for Instagram in seconds. Exact pixel dimensions for posts, stories, reels, and profiles.
LinkedIn Profile Picture Size Guide
Get the correct LinkedIn profile picture size. Learn the exact dimensions, how to resize, and keep it looking sharp.
YouTube Thumbnail & Image Sizes
All YouTube image sizes: thumbnail 1280x720, channel art 2560x1440, profile 800x800. Resize free in browser.
Practical Guides
How to Resize Image Online Free
Learn how to resize image online free in seconds. Resizo processes images directly in your browser without uploads.
How to Reduce Image File Size for Email
Reduce image file size before emailing — compress JPG & PNG to under 1MB instantly. No upload needed.
Resize Product Images for E-commerce
Product image sizes for Shopify, WooCommerce, Amazon, Etsy. Resize product photos free in your browser.
JPG vs PNG vs WebP: Which Format to Use?
Compare JPG, PNG and WebP formats — file size, quality, transparency & browser support. Convert for free.
Popular Social Media Image Sizes
Click any size below to instantly apply it in the editor above.
Instagram
YouTube
Facebook
Twitter / X
LinkedIn
WhatsApp