Resize multiple images at once · Download individually or all as ZIP
Click or drag & drop images here
Supports JPG, PNG, GIF, BMP, WebP · Multiple files allowed
Powered by Toolraxy · Bulk image resizer | Client-side processing
Founder & CEO, Toolraxy
Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.
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Uploading oversized images slows down websites, eats up storage space, and frustrates visitors. The Bulk Image Resizer solves this problem by letting you resize multiple images simultaneously right in your browser, no upload required.
Whether you’re a web developer optimizing product photos, a social media manager preparing batch content, or a photographer sending compressed proofs, this tool handles the heavy lifting. Upload JPG, PNG, GIF, BMP, or WebP files, set your target dimensions, and watch as each image processes locally on your device.
Here’s what makes this different: your images never leave your computer. Everything happens client-side using JavaScript canvas technology. That means no privacy concerns, no waiting for server uploads, and no file size limits beyond what your browser can handle. Download resized images individually or grab everything as a single ZIP file. Toolraxy built this for speed, privacy, and batch efficiency.
Upload your images – Click the upload area or drag-and-drop multiple image files
Set target dimensions – Enter width and height in pixels (default: 800×600)
Choose aspect ratio – Check “Maintain aspect ratio” to prevent distortion
Pick resize mode – Choose “Fit within dimensions” or “Exact dimensions (stretch)”
Adjust quality – Set from 10% (smallest file) to 100% (best quality)
Select output format – JPEG, PNG, or WebP
Download results – Click individual Download buttons or use Download All (ZIP)
The tool processes images inside your browser using HTML5 Canvas. No data ever leaves your device.
Step 1 – Read original image: The tool loads each image to get its original width and height in pixels.
Step 2 – Calculate new dimensions:
If Maintain Aspect Ratio = ON and Mode = Fit: The tool finds which dimension (width or height) needs to scale down more, then uses that smaller scale factor for both dimensions. This keeps the entire image visible inside your target box.
If Maintain Aspect Ratio = OFF: The tool stretches the image to exactly your entered width and height, regardless of original proportions.
Step 3 – Draw and compress: The tool draws the resized image onto a canvas, then exports it as JPEG, PNG, or WebP at your chosen quality setting (85% default).
Step 4 – Deliver results: Each processed image becomes downloadable individually or collected into a ZIP file.
Validation rules: Empty inputs default to original dimensions. Quality values stay between 10-100%. Non-image files are ignored.
Scenario: A blogger has 5 product photos, each originally 4000×3000 pixels (about 3 MB each). They need 800×600 pixel versions for their website.
Step-by-step for one image:
Original image: 4000×3000 pixels
Target dimensions entered: 800×600 pixels
Aspect ratio maintained: 4000÷3000 = 1.33, 800÷600 = 1.33 (matches perfectly)
Scale factor: 800÷4000 = 0.2 (image reduces to 20% of original size)
New dimensions: 800×600 pixels
Quality: 85% JPEG compression
Result: File drops from 3 MB to about 100 KB
Interpretation: The 3 MB photo reduces to roughly 100 KB—a 97% size reduction with no visible quality loss. For 5 photos, total reduction from 15 MB to 0.5 MB.
Clear takeaway: Bulk resizing 5 product photos takes about 5-10 seconds locally. Your images stay private because nothing uploads to any server.
Saves massive time – Process 100 images in the same time as 1 image
Completely private – Images never upload to any server
No file size limits – Only your computer’s memory is the constraint
Free forever – No subscriptions, watermarks, or registration
Multiple format support – JPG, PNG, GIF, BMP, WebP input; JPEG, PNG, WebP output
ZIP batch download – Get all resized images in one compressed file
Real-time preview – See each image card update as processing completes
Works offline – Disconnect internet after page loads and continue using
The resizer produces pixel-perfect dimensions matching your target width and height. Visual quality depends on your quality setting. At 85% quality, results match desktop software visually.
Only when the original aspect ratio matches your target dimensions exactly. Otherwise, uncheck “maintain aspect ratio” to force exact dimensions, but images will stretch. For distortion-free exact sizing, crop images first to match your target ratio.
JPEG – Lossy compression optimized for photos. Small files, quality degrades each save. PNG – Lossless with transparency. Larger files, ideal for logos and screenshots. WebP – Modern format offering 25-35% smaller files than JPEG with transparency. Works in 96%+ of browsers.
Yes. Everything processes locally using JavaScript. Images never leave your browser, no data transmits to any server. You can disconnect internet after loading and it continues working normally.
The button enables only after an image finishes processing. Processing happens automatically after upload. Large images may take several seconds per image. The progress bar shows overall completion.
No hard limit. Practical limits depend on your computer’s RAM. Testing shows 100-200 standard JPEGs work smoothly. For 500+ images, your browser may slow down. Process in smaller batches if needed.
The tool cancels current processing and restarts with new settings. Wait for one batch to complete before changing settings to avoid repeated processing.
Technically yes, but this creates pixelation and blurriness. The tool doesn’t prevent upscaling, but for best quality, never resize larger than original dimensions.
Yes. The canvas API does not preserve EXIF metadata (camera settings, GPS location). This improves privacy by removing location data from photos.
85% – Industry standard for web images. Visually indistinguishable from 100% to most viewers. 90-95% – For high-quality portfolios. 70-80% – For thumbnails or email attachments. Below 60% – Visible artifacts appear. For text-heavy images, use PNG or WebP at 100% quality.
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