Image Resizer
Resize images online for free. Perfect for social media with presets for Instagram, Facebook, Twitter, LinkedIn, and YouTube.
Upload an image and enter a target width or height to resize it while preserving aspect ratio. Supports JPG, PNG, and WebP up to 20 MP.
Social Presets
Instagram, Facebook & more
100% Private
Images stay on your device
Batch Resize
Up to 20 images at once
Why Choose Forge Resize?
Unlike Canva, Adobe Express and Pixlr, Forge Resize offers a genuinely free, private, and unlimited experience with no strings attached.
100% Free Forever
No hidden fees, no premium tiers, no limits.
Complete Privacy
Everything runs in your browser. We never see your data.
No Signup Required
Use instantly without creating an account.
Unlimited Use
No daily limits, no credits, no restrictions.
Last updated: January 2026 • Built with care by iForge Apps
How Image Resizing Works
Resizing changes the pixel dimensions of an image, making it larger or smaller while keeping all the content visible. Think of it like zooming a projector: the whole picture stays, but the frame gets bigger or smaller.
When you shrink an image, the algorithm combines neighbouring pixels to produce fewer, averaged pixels. The result is sharp because you're discarding detail, and there's always more detail to discard. When you enlarge, the algorithm interpolates, essentially guessing what new pixels should look like based on their neighbours. That's why shrinking always looks crisp, but enlarging past 150-200% starts looking soft or blocky.
This resizer runs entirely in your browser using the Canvas API. Your images stay on your device, nothing gets uploaded. You can resize to exact pixel dimensions or by percentage, with the option to lock the aspect ratio so your image doesn't get stretched or squashed.
Platform & App Image Sizes
Every platform has exact dimension requirements. Upload the wrong size and your image gets cropped, stretched, or compressed unpredictably. Search for your platform to get the right dimensions first time.
| Platform | Width × Height | Ratio |
|---|---|---|
| Instagram Post (square) | 1080×1080 | 1:1 |
| Instagram Post (portrait) | 1080×1350 | 4:5 |
| Instagram Post (landscape) | 1080×566 | 1.91:1 |
| Instagram Story / Reel | 1080×1920 | 9:16 |
| Instagram Profile Photo | 320×320 | 1:1 |
| Facebook Post | 1200×630 | 1.91:1 |
| Facebook Cover Photo | 820×312 | 2.63:1 |
| Facebook Profile Photo | 170×170 | 1:1 |
| Twitter/X Post | 1600×900 | 16:9 |
| Twitter/X Header | 1500×500 | 3:1 |
| LinkedIn Banner | 1584×396 | 4:1 |
| LinkedIn Post | 1200×627 | 1.91:1 |
| Pinterest Pin | 1000×1500 | 2:3 |
| YouTube Thumbnail | 1280×720 | 16:9 |
| YouTube Channel Art | 2560×1440 | 16:9 |
| TikTok Video Cover | 1080×1920 | 9:16 |
| Shopify Product | 2048×2048 | 1:1 |
| Amazon Product (main) | 2000×2000 | 1:1 |
| eBay Listing | 1600×1600 | 1:1 |
| Etsy Product | 2000×2000 | Various |
| Website Hero (HD) | 1920×1080 | 16:9 |
| Website Hero (4K) | 3840×2160 | 16:9 |
| Blog Featured Image | 1200×628 | 1.91:1 |
| Email Header | 600×200 | 3:1 |
| Email Signature Logo | 300×100 | 3:1 |
| Favicon | 512×512 | 1:1 |
| Open Graph (OG) | 1200×630 | 1.91:1 |
| Twitter Card | 1200×628 | 1.91:1 |
| UK Passport Photo | 600×750 | 4:5 |
| US Passport Photo | 600×600 | 1:1 |
| Visa Photo (Schengen) | 413×531 | ~3:4 |
| Apple App Store Screenshot | 1290×2796 | ~9:19.5 |
| Google Play Screenshot | 1080×1920 | 9:16 |
| Wallpaper (1080p) | 1920×1080 | 16:9 |
| Wallpaper (4K) | 3840×2160 | 16:9 |
| iPhone Wallpaper | 1290×2796 | ~9:19.5 |
| WhatsApp Profile | 500×500 | 1:1 |
| Google My Business | 720×720 | 1:1 |
Showing 38 of 38 platforms.
Aspect Ratios Explained
Aspect ratio is the relationship between width and height. Getting it wrong means your image gets stretched, squashed, or cropped in ways you didn't intend. Here's every ratio you'll encounter:
| Ratio | Decimal | Type | Common Uses |
|---|---|---|---|
| 1:1 | 1.00 | Square | Instagram square, profile photos, product images, album art |
| 4:3 | 1.33 | Classic photo | Compact cameras, iPad displays, older TV standard |
| 3:2 | 1.50 | DSLR photo | 35mm film, most DSLR/mirrorless cameras, 6×4 prints |
| 16:9 | 1.78 | Widescreen | YouTube, TV, monitors, presentations, hero images |
| 4:5 | 0.80 | Portrait | Instagram portrait, UK passport photos, 8×10 prints |
| 9:16 | 0.56 | Vertical video | Instagram Stories, TikTok, YouTube Shorts, phone wallpaper |
| 2:3 | 0.67 | Tall portrait | Pinterest pins, movie posters, book covers |
| 1.91:1 | 1.91 | Social preview | Facebook link preview, Open Graph, Twitter card, LinkedIn |
| 21:9 | 2.33 | Ultra-wide | Cinema displays, ultra-wide monitors, movie letterbox |
| 3:1 | 3.00 | Banner | Twitter header, email headers, website banners |
Quick tip: When resizing, always lock the aspect ratio to prevent distortion. If you need to change the ratio (e.g., square photo to landscape), crop first using our Image Cropper, then resize to your target dimensions.
Resizing vs Cropping vs Compressing
Three different operations that people constantly mix up. Each solves a different problem.
Resize (this tool)
Changes pixel dimensions. The whole image scales up or down. Nothing gets cut away, the content is identical, just at a different size.
When to use: Image is the right crop but wrong pixel dimensions for your platform.
Crop
Cuts away outer edges. The remaining portion stays at original resolution. Content is removed, not scaled.
When to use: Need to change the aspect ratio, remove unwanted edges, or focus on a specific subject.
Compress
Reduces file size without changing dimensions. Discards invisible colour data. Pixel count stays the same.
When to use: Image dimensions are correct but the file is too large (slow loading, exceeds upload limit).
Common workflow: Crop first (get the composition right), resize second (hit the target dimensions), compress third (reduce the file size). Doing them in the wrong order wastes effort.
DPI vs Pixels: When It Matters
For screens (DPI doesn't matter)
Screens display pixels, not inches. A 1920×1080 image looks exactly the same whether it's labelled "72 DPI" or "300 DPI", the DPI metadata is ignored entirely. Only pixel dimensions matter for web, social media, email, and digital use.
For print (DPI matters)
Print maps pixels to physical inches. A 3000×2000 image at 300 DPI prints as 10×6.7 inches. At 150 DPI, the same pixels print as 20×13.3 inches, much larger but much blurrier. Standard print quality: 300 DPI. Large format / posters: 150 DPI is usually fine because viewing distance is greater.
| Print Size | Pixels Needed (300 DPI) | Pixels Needed (150 DPI) | Common Use |
|---|---|---|---|
| 4×6 inches | 1200×1800 | 600×900 | Standard photo print |
| 5×7 inches | 1500×2100 | 750×1050 | Greeting cards, framed photos |
| 8×10 inches | 2400×3000 | 1200×1500 | Wall prints, portraits |
| A4 (8.3×11.7") | 2490×3510 | 1245×1755 | Documents, flyers, worksheets |
| A3 (11.7×16.5") | 3510×4950 | 1755×2475 | Posters, architectural plans |
| 11×14 inches | 3300×4200 | 1650×2100 | Gallery prints, large frames |
| 16×20 inches | 4800×6000 | 2400×3000 | Canvas prints, wall art |
| 24×36 inches | 7200×10800 | 3600×5400 | Large posters, exhibition prints |
Quick formula: Pixels needed = Print size in inches × DPI. For a 10-inch wide print at 300 DPI: 10 × 300 = 3,000 pixels wide. If your image is smaller than needed, you'll get a blurry print.
Worked Example: Preparing Product Photos for Multi-Channel Selling
The situation: Amara runs a jewellery business. She photographs her pieces on her iPhone (4032×3024 pixels, ~5 MB each). She sells on Shopify, Etsy, and Instagram, and each platform wants different dimensions.
Step 1: Start from the original
Amara always resizes from her original 4032×3024 photos, never from a previously resized copy. She keeps the originals in a "Masters" folder and creates resized versions in platform-specific folders.
Step 2: Shopify (2048×2048 square)
She crops her photo to 1:1 square first (centering the necklace), then resizes to 2048×2048. Shopify auto-generates the thumbnail and zoom sizes from this master image.
Step 3: Etsy (2000×2000 but 4:3 in search)
Etsy search results crop to 4:3, so she uses the same 2048×2048 square but positions the product so it looks good when the sides are clipped. She resizes to 2000×2000 to match Etsy's recommendation.
Step 4: Instagram (1080×1350 portrait)
For Instagram, 4:5 portrait gets the most screen space. She crops from the original to 4:5, then resizes to 1080×1350. The taller frame shows off the necklace's full length.
Result
Three versions from one photo, each optimised for its platform. Total time: about 3 minutes per product. The images look crisp because she resized down from the full-resolution original, not up from a smaller version.
Tips for Sharp Results
Lock the aspect ratio
Changing width without proportionally adjusting height stretches or squashes your image. Always lock the ratio unless you specifically want distortion (hint: you almost never do).
Shrink, don't enlarge
Downsizing looks great because you're discarding detail. Upsizing past 150% introduces noticeable blur. If you need a larger image, start with a higher-resolution source or use AI upscaling.
Start from the largest source
Always resize from the original high-res image, not from a previously resized copy. Each resize degrades quality slightly, chaining them multiplies the loss.
Compress after resizing, not before
Resize first (get the pixel dimensions right), then compress (reduce the file size). Compressing before resizing means the resize algorithm works with already-degraded data.
Common Mistakes
Stretching to fill
Resizing a 4:3 photo to a 16:9 frame without cropping first. The result is a horizontally stretched, distorted image. Crop to the target ratio first, then resize.
Enlarging past 200%
Making a 500×500 image into a 2000×2000 image. The algorithm has to invent 75% of the pixels, the result is visibly soft and blurry. Start with a higher-resolution source.
Resizing a resized image
Taking a photo you previously resized to 800px, then resizing it again to 1200px. Each pass degrades quality. Always go back to the original file.
Wrong format for the content
Saving a screenshot as JPEG (creates artifacts around text) or a photo as PNG (unnecessarily large file). Use JPEG/WebP for photos, PNG for screenshots and graphics with text.
Ignoring retina displays
A website displays an image at 600px wide, but on a 2× retina screen, it needs 1200px for crisp rendering. For web images, supply 2× the display size or use responsive srcset attributes.
Not checking the result
Batch resizing and uploading without checking a sample. Open at least one resized image at 100% zoom to verify it's sharp, correctly proportioned, and the right file size for your platform.
Related Tools
Image Compressor
Reduce file sizes without changing dimensions
Image Cropper
Cut away unwanted edges and change aspect ratio
Image Upscaler
Enlarge images with AI enhancement
Aspect Ratio Calculator
Calculate target dimensions for any ratio
Image to WebP
Convert to WebP for smaller web files
Favicon Generator
Generate all favicon sizes from one image
How to use this tool
Upload images, drag and drop or select up to 20 at once
Choose a social media preset or enter custom dimensions
Download resized images individually or as a ZIP
Common uses
- Resizing photos to exact Instagram, Facebook, or YouTube dimensions
- Creating correctly sized thumbnails for blog posts or portfolios
- Preparing images for print with specific pixel dimensions
- Batch-resizing product photos to uniform dimensions for an online store
- Fitting images into presentation slides or email templates
Share this tool