How to Use This Tool
Upload Your Image
Click the upload area, drag and drop an image, or paste from clipboard (Ctrl+V). Supports JPEG, PNG, WebP, BMP, and GIF up to 50 MB.
Choose Resize Settings
Select a resize mode: exact pixels, percentage scale, social media preset, or target file size. Lock aspect ratio to prevent distortion, or unlock for custom dimensions.
Apply Transforms
Rotate the image left or right by 90 degrees, flip horizontally or vertically. Choose stretch, fit (with background color), or cover resize method.
Download
Click Resize & Download to save the result. Choose PNG for lossless quality, JPEG or WebP for smaller files with adjustable quality. For batch processing, switch to the Batch tab.
Frequently Asked Questions
Does resizing reduce image quality?
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Enlarging an image beyond its original dimensions can reduce sharpness because the browser must interpolate new pixels. Shrinking an image generally preserves quality well. For the best results, resize to smaller dimensions and choose PNG for lossless output or JPEG/WebP with quality above 85%.
Is my image uploaded to a server?
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No. This tool runs 100% in your browser. Your images never leave your device. All resizing happens locally using the browser's Canvas API. No data is transmitted, no cookies are used, and no third-party services have access to your files.
What is the maximum file size?
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The maximum file size is 50 MB per image. In batch mode, there is no limit on the number of images — add as many as you need. All resized images are downloaded as a single ZIP file.
What resize modes are available?
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Four modes: Pixels (exact width/height), Percentage (scale by %), Preset (18 social media and standard sizes), and Target File Size (specify KB and the tool finds the optimal quality). Each mode also offers three resize methods: Stretch (fills exact dimensions, may distort), Fit (scales to fit with background color), and Cover (fills by cropping).
How does the target file size mode work?
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Enter a target size in KB and the tool uses a binary search algorithm to find the optimal JPEG or WebP quality that produces a file closest to your target. It tests multiple quality levels automatically and picks the best match within 5% tolerance.
Can I resize to exact social media dimensions?
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Yes. The Preset mode includes 18 pre-configured sizes: Instagram Post (1080×1080), Instagram Story (1080×1920), Facebook Post (1200×630), Facebook Cover (820×312), Twitter Post (1200×675), Twitter Header (1500×500), YouTube Thumbnail (1280×720), YouTube Banner (2560×1440), LinkedIn Post (1200×627), LinkedIn Cover (1584×396), Pinterest Pin (1000×1500), WhatsApp DP (500×500), HD 720p (1280×720), Full HD 1080p (1920×1080), 4K 2160p (3840×2160), Passport Photo (600×600), A4 at 300dpi (2480×3508), and Favicon (32×32). Select a preset and the tool automatically sets the width and height.
What is aspect ratio lock?
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When enabled, changing the width automatically adjusts the height (and vice versa) to maintain the original proportions. This prevents your image from being stretched or squished. Disable it when you need exact dimensions regardless of distortion.
Can I rotate and flip images?
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Yes. Use the rotation buttons to rotate 90° clockwise or counterclockwise, and the flip buttons to mirror horizontally or vertically. Rotation and flipping are applied during the resize operation.
What output formats are supported?
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PNG (lossless, larger files), JPEG (lossy, smaller files with quality slider), and WebP (modern format, smallest files with quality slider). Choose PNG when you need pixel-perfect quality or transparency.
Will my images be saved if I close the browser?
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Yes. Your uploaded image and resize settings are automatically saved in your browser's IndexedDB storage. When you return to this page, everything is restored exactly as you left it.
What Is Image Resizer?
Image Resizer is a browser-based tool that lets you resize, rotate, flip, and convert images instantly. Upload an image, set your desired dimensions or percentage, pick a format, and download the result — all without uploading anything to a server. This tool runs 100% client-side using the HTML5 Canvas API.
It supports single image resizing with pixel, percentage, preset, and target file size modes, as well as batch resizing with ZIP download. Features include aspect ratio lock, rotation, flipping, three resize methods (stretch, fit, cover), format conversion (PNG, JPEG, WebP), quality control, and IndexedDB persistence across page refreshes.
Features Explained
Pixel Mode
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Enter exact width and height in pixels. Enable Lock Aspect Ratio to automatically calculate the other dimension when you change one. Ideal when you need precise output dimensions.
Percentage Mode
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Scale the image by a percentage of its original size. Enter 50 for half size, 200 for double. The equivalent pixel dimensions are shown below the input for reference.
Preset Mode
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Choose from 18 pre-configured sizes for popular platforms: Instagram Post/Story, Facebook Post/Cover, Twitter, YouTube Thumbnail/Banner, LinkedIn, Pinterest, WhatsApp, HD, Full HD, 4K, Passport Photo, A4, and Favicon.
Target File Size
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Specify a target file size in KB. The tool uses a binary search algorithm to find the optimal JPEG/WebP quality that produces a file closest to your target size, within 5% tolerance.
Resize Methods
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Stretch fills the exact dimensions (may distort). Fit scales the image to fit inside the dimensions with a customizable background color. Cover scales to fill the dimensions completely, cropping overflow.
Rotation & Flipping
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Rotate the image by 90 degrees left or right. Flip horizontally or vertically. All transforms are applied during the final resize and reflected in the live preview.
Format Conversion
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Convert between PNG (lossless, larger), JPEG (lossy, smaller), and WebP (modern, smallest). JPEG and WebP include a quality slider from 1-100% for fine control over file size vs. quality.
Batch Processing
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Switch to the Batch tab to resize any number of images at once with identical settings. Each image is processed with the same dimensions, format, quality, rotation, and resize method. All resized images are packaged into a single ZIP file for download. Files up to 50 MB each are supported.
Live Preview
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The preview area updates in real-time as you change dimensions, resize method, rotation, or flipping. A dimensions overlay shows the exact output size at all times.
EXIF Metadata Stripping
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Resized images automatically have EXIF metadata (camera info, GPS coordinates, orientation) removed. This protects your privacy when sharing images online.
IndexedDB Persistence
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Your uploaded image and all settings are saved to your browser's IndexedDB. Refreshing the page restores everything exactly as you left it. Click Clear All to remove all stored data.
Who Is This Tool For?
Social Media Managers
Resize images to exact platform dimensions for Instagram, Facebook, Twitter, LinkedIn, Pinterest, and YouTube using built-in presets.
Web Developers
Optimize images for websites by resizing to exact pixel dimensions, converting to WebP, and reducing file sizes for faster page loads.
Photographers
Batch resize photos for client delivery, create web-resolution copies, and strip EXIF metadata before sharing online.
Bloggers & Content Creators
Resize featured images, thumbnails, and in-post images to match your site's layout requirements without opening heavy editing software.
E-commerce Sellers
Resize product photos to marketplace-specific dimensions and compress them to meet file size requirements for Amazon, Etsy, and Shopify listings.
Graphic Designers
Quickly resize assets for different deliverables — social media, print, web — with precise pixel control and format conversion.
UI/UX Designers
Resize mockup screenshots and UI assets to exact dimensions for design documentation, handoff materials, and presentation decks.
Email Marketers
Use Target File Size mode to compress newsletter images to fit email size limits without guessing quality settings.
Students
Resize images for homework, presentations, and thesis documents. Use the Passport Photo and A4 presets for official submissions.
Teachers & Professors
Resize images for course materials, lecture slides, and online learning platforms that require specific image dimensions.
Freelancers
Batch resize client deliverables with consistent dimensions and format without needing Photoshop or other paid software.
Print Designers
Resize images to print-ready dimensions like A4 at 300 DPI. Use Fit mode with a white background for exact canvas sizes.
Video Editors
Resize thumbnails and overlay images to match video resolution — use HD, Full HD, or 4K presets for exact dimensions.
Game Developers
Resize sprites, textures, and UI assets to exact pixel dimensions. Use percentage mode to scale assets for different screen densities.
Real Estate Agents
Resize property photos to meet listing platform requirements and compress them for faster upload to MLS and property websites.
HR & Recruiters
Resize headshots and team photos for job portals, company intranets, and ATS systems that require specific image dimensions.
Non-Profit Workers
Resize images for donation pages, newsletters, and grant reports without needing design software or IT support.
Architects & Engineers
Resize site photos and reference images for project reports, CAD overlays, and client presentations at exact dimensions.
Marketing Teams
Batch resize campaign assets across all platforms — social media, email, web banners — with consistent quality and format.
Podcast Hosts
Resize cover art and episode thumbnails to exact dimensions required by Spotify, Apple Podcasts, and YouTube.
Small Business Owners
Resize logo and product images for your website, social media profiles, and Google Business listing without hiring a designer.
Event Planners
Resize event photos and promotional images for invitations, social media announcements, and venue websites.
Journalists
Resize photos for articles and CMS platforms that enforce specific image dimensions and file size limits for upload.
App Developers
Resize app icons, splash screens, and promotional screenshots to exact dimensions required by Apple App Store and Google Play.
Supported File Types
| Format | Input | Output | Quality Control |
|---|---|---|---|
| PNG | Yes | Yes | Lossless (no slider) |
| JPEG | Yes | Yes | 1-100% slider |
| WebP | Yes | Yes | 1-100% slider |
| BMP | Yes | No | N/A |
| GIF | Yes | No | N/A |
Tips for Resizing Images
Use WebP for smallest files
WebP produces significantly smaller files than JPEG at the same visual quality. Most modern browsers and platforms support it. Choose WebP from the format dropdown for the best compression.
Lock aspect ratio to avoid distortion
Keep the lock enabled when resizing by pixels. This automatically calculates the other dimension to maintain the original proportions. Disable it only when you need exact custom dimensions.
Use Target Size for email attachments
Many email providers limit attachment sizes. Use Target Size mode to compress images to a specific KB limit — the tool finds the optimal quality automatically within 5% tolerance.
Batch resize for consistency
When preparing images for a website or social media campaign, use the Batch tab to resize all images with identical dimensions, format, and quality. Download everything as a single ZIP file.
Use Fit mode for exact canvas sizes
When you need an exact canvas size (e.g., 1080x1080 for Instagram) but your image has a different aspect ratio, Fit mode adds a customizable background color instead of cropping or distorting.
Use presets for social media
The Preset mode includes 18 ready-made sizes for Instagram, Facebook, Twitter, YouTube, LinkedIn, Pinterest, WhatsApp, and standard resolutions like HD, 4K, A4, and Passport Photo.
Rotate and flip before resizing
Use the transform controls to rotate 90° left or right, or flip horizontally/vertically. Transforms are applied during the final resize and shown in the live preview.
Use Cover mode for thumbnails
Cover mode fills the exact dimensions by scaling up and cropping overflow — perfect for thumbnails and profile pictures where you want the entire frame filled with no background.
Paste screenshots directly
Press Ctrl+V to paste a screenshot from your clipboard. This is the fastest way to resize a screenshot without saving it as a file first.
Your work persists automatically
Your image and all settings are saved to IndexedDB. Refresh the page and everything is restored. Click Clear All to start fresh.
Privacy & Security
This tool runs 100% in your browser. Your images are never uploaded to any server. All resizing, rotation, format conversion, and compression happens locally using the HTML5 Canvas API.
Images are stored in your browser's IndexedDB so they persist across page refreshes. This data lives only on your computer and is never transmitted. Click Clear All to remove all stored data immediately. No cookies are used, no analytics track your files, and no third-party services have access to your images. EXIF metadata (camera info, GPS, orientation) is automatically stripped from resized images.