IMAGE RESIZER
Resize, crop, and optimize images in bulk
Everything runs locally in your browser. Your data never leaves your device - no uploads, no servers, no data transmission.
All processing happens directly on your machine using JavaScript. Close the tab and all image data is gone.
Drop images here
or click to browse
Resize analytics
Upload images
Drag & drop or select images to resize
Configure settings
Set dimensions, format, and quality options
Download results
Get individual or bulk resized images
Why choose this image resizer?
3 resize methods, watermarks, 12 presets
3 resize methods
Dimensions, percentage (10-200%), or platform presets. 12 presets for Instagram, TikTok, Facebook, X/Twitter, YouTube, LinkedIn, Pinterest, Threads.
4 unit types
Resize in pixels, millimeters, centimeters, or inches. Perfect for print projects with precise physical dimensions.
Bulk processing
Upload and resize multiple images at once. Save time with batch operations.
Crop & rotate
Advanced crop tool with aspect ratio presets (1:1, 16:9, 4:3). Rotate 90° increments.
Text watermarks
Custom text watermarks with 9 positions, adjustable opacity, font size, and color.
8 format conversions
Convert between JPEG, PNG, WebP, GIF, TIFF, BMP, AVIF, ICO. Quality control (1-100%). Modern format support.
Frequently Asked Questions
Everything about resizing and optimizing images
How do I resize images?
Upload your images, choose resize method (dimensions or percentage), set your desired size, and click Resize. Download individual images or get all as ZIP.
Can I resize multiple images at once?
Yes! Upload multiple images at once and apply the same settings to all. Download all resized images as a ZIP file with one click. Perfect for batch processing hundreds of photos.
What image formats are supported?
Input: JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO, HEIC, and HEIF. Output: 8 formats (JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO) with quality control. Note: HEIC/HEIF is supported for upload only, not for export.
Will resizing reduce image quality?
High-quality Lanczos3 resampling algorithms are used for resizing. Downsizing preserves quality well. You control the quality slider for compression level.
How do platform presets work?
Platform presets automatically set optimal dimensions for social media platforms. 12 presets available: Instagram square, portrait, and story; TikTok; Facebook post and cover; X/Twitter post and header; YouTube thumbnail; LinkedIn; Pinterest; and Threads.
Can I add watermarks?
Yes! Add custom text watermarks with adjustable position (9 locations), opacity, font size, and color. Perfect for protecting copyrighted photos or branding images. Applied during export.
Is my data secure?
All processing happens locally in your browser using Canvas API. Your images never leave your device - no server upload, no cloud storage. Perfect for sensitive photos.
Technical Details
How this resize image online free tool works
Client-Side Canvas Resampling
This resize image online free tool uses Lanczos3 resampling via the Pica library for high-quality pixel interpolation. Resize image to exact pixels with precise width and height control in 4 unit types (px, mm, cm, inches). Change image dimensions online with aspect ratio lock or free-form scaling. All pixel manipulation happens locally in your browser - zero server interaction.
Zero-Upload Architecture
Image resizer no upload - entirely JavaScript execution with zero data transmission. No image data is logged or cached, no thumbnails stored. Resize photo without losing quality in an isolated browser context. Bulk image resizer free processes multiple files sequentially in local volatile memory. Close the tab and all data is gone.
Resize Modes
Exact pixel dimensions, percentage scaling (10-200%), and 12 preset social media sizes (Instagram, TikTok, Facebook, X/Twitter, YouTube, LinkedIn, Pinterest, Threads). Aspect ratio lock prevents distortion. Batch resize with consistent output dimensions across all files. Export as JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, or ICO with quality slider from 10% to 100%.
Performance
No server-imposed limits on file size or resolution - processing capacity depends on available browser memory. No software installation, no Java, no Flash, no plugins. Works on desktop, tablet, and mobile browsers with real-time preview before download.
Watermark & Visual Editing
Text watermark system with 9 position grid (corners, edges, center). Adjustable opacity from 0% to 100%, font size from 12px to 72px, and custom color picker. Crop tool with aspect ratio lock and free-form selection. 90-degree rotation in both directions. All edits applied non-destructively during export.
Platform Presets & Batch Export
12 platform-specific dimension presets covering Instagram (post, portrait, story), TikTok, Facebook (post, cover), X/Twitter (post, header), YouTube, LinkedIn, Pinterest, and Threads. Batch processing applies identical settings across all uploaded files. ZIP export via JSZip bundles all resized images for single download.