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.
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.
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
- Story / Reel1080 × 1920 px
- Thumbnail1280 × 720 px
- Channel Art2560 × 1440 px
- Profile Picture800 × 800 px
- Cover Photo820 × 312 px
- Post Image1200 × 630 px
- Profile Picture180 × 180 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
Why You Should Never Upload Private Photos
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Privacy-First Image Editing: No Upload Needed
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Resizo vs iLoveIMG: Privacy & Speed Compared
Side-by-side comparison of privacy, speed, format support, and pricing. Find out which resizer is right for you.
Resizo vs TinyPNG: Local vs Cloud Compression
Comparison of image compression, privacy, file limits, format support, and pricing between Resizo and TinyPNG.
Compression & Resizing
Batch Image Toolkit Free: Bulk Resize, Convert, Watermark, Rename, Crop
Six free batch tools that run entirely in your browser — bulk resize, convert JPG to WEBP, watermark, rename, crop. No upload, no account.
How to Reduce Photo File Size Online Free
Reduce photo file size online for free. Cut MB to KB without visible quality loss. Browser-based, no upload.
Resize an Image Without Losing Quality
Learn how to resize an image without losing quality. Discover techniques to keep your images sharp.
Compress PNG Without Losing Quality
Compress PNG files without losing quality. Learn lossless PNG optimization and WebP conversion strategies.
The Fastest Way to Bulk Resize Images
Need a faster bulk image resizer? Learn how to resize images without uploading and convert them to WebP.
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