Bulk Image Compress
Compress multiple images at once with adjustable quality and format output. Auto...Compress multiple images at once with adjustable quality and format output. Automatically skips files that are already optimized. All processing runs ...
Features
Why Use Bulk Image Compress?
Auto-Skips Optimized Files
Already compressed that image? The tool detects when compression would make a file larger and automatically skips it, saving you time and preventing quality degradation on files that are already optimized.
True Batch Efficiency
Process 50 images in under 30 seconds. Files are compressed in parallel batches of 5, using your browser's multi-threaded Canvas API. No waiting for sequential server uploads and downloads.
Precision Quality Control
Set quality from 10% to 100% for every image in the batch. At 75% quality, a typical 3 MB JPEG drops to 600 KB with virtually no visible difference on screen.
Measurable Storage Savings
A batch of 100 product photos at 2 MB each totals 200 MB. After compression at 80% quality, expect roughly 50 MB total -- saving 150 MB of storage and bandwidth costs per page load cycle.
Direct Page Speed Impact
Images account for roughly 50% of average page weight. Compressing a 5 MB hero image to 800 KB can cut Largest Contentful Paint by 1.5-2.5 seconds on 4G connections, directly improving Core Web Vitals scores.
Complete Client-Side Privacy
Every pixel stays on your device. Compression uses the browser's native Canvas API and HTML5 toBlob method. Zero server contact means zero risk of interception, data mining, or GDPR compliance headaches.
Real-World Use Cases
E-Commerce Product Catalog
A store with 500 products and 4 images each has 2,000 photos. At an average 2.5 MB per raw photo, that is 5 GB of images. Compress the batch to WebP at 80% quality and cut it to roughly 900 MB -- an 82% reduction that directly accelerates category page loads from 6.2s to 1.8s.
Blog Content Migration
Migrating a blog with 100 articles averaging 5 images each means 500 images to optimize. Older articles often have uncompressed PNGs and oversized JPEGs. Bulk compress to JPEG at 80% quality with a 1280px max width to reclaim 2-3 GB of storage and shave 1.5 seconds off average article load times.
Photography Portfolio
Showcase 200 high-resolution portfolio images without torturing your visitors' bandwidth. Compress display copies to WebP at 85% quality, keeping originals for download. A 12 MB RAW-exported JPEG drops to 1.5-2 MB in WebP -- fast enough for gallery grids while preserving the detail that matters.
Email Marketing Campaign
Most email clients cap total message size at 10-25 MB, and images over 1 MB load slowly on mobile. Compress 20 campaign images from an average 1.8 MB to 300 KB each (JPEG at 70% quality) so the total email payload stays under 6 MB and renders in under 2 seconds on 4G connections.
How It Works
Drop Images or a ZIP Archive
Drag and drop individual images or an entire ZIP file. Supports JPEG, PNG, WebP, AVIF, GIF, HEIC, and TIFF. Up to 50 images per batch.
Select Output Format and Quality
Choose Auto (WebP), JPEG, PNG, WebP, or AVIF output. Set quality with the slider -- 75-85% is the sweet spot for web images. Optionally cap the max width to downscale large originals.
Compress the Entire Batch
Hit 'Compress All' and watch each thumbnail update in real time. Already-optimized images are flagged and skipped automatically so you never degrade quality unnecessarily.
Download Individually or as ZIP
Grab any single compressed image, or download the entire batch as one ZIP file. File names are preserved with a '_compressed' suffix for easy identification.
Optimization Tips
Target 75-80% Quality for Web
At 80% quality, a 3 MB JPEG compresses to roughly 600 KB -- a 5x reduction. Below 70%, artifacts become visible on retina displays. Above 85%, returns diminish sharply: 90% vs 85% saves only 5-8% more bytes.
Use WebP for Modern Sites
WebP saves 25-34% over JPEG at the same perceived quality. With 97%+ browser support in 2025, there is no reason to avoid it for web delivery. Set output to Auto and the tool picks WebP by default.
Do Not Re-Compress Already Compressed Files
Each round of lossy compression compounds quality loss. A JPEG compressed twice at 80% looks equivalent to a single pass at roughly 64% quality. If the tool marks files as 'Already optimized,' trust it -- those files are at their floor.
Cap Max Width to 1920px for Most Websites
Few visitors have screens wider than 1920px. Serving a 4000px-wide image to a 1440px viewport wastes 75% of the pixels. Set Max Width to 1920 to downscale oversized originals, often cutting file size by 60%+ before compression even starts.