Bulk Image Optimizer
Convert hundreds of images to WebP or AVIF in seconds. Batch processing, single ZIP download, zero uploads.
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Drop images here or click to browse
JPG, PNG, WebP, GIF, BMP, SVG — batches of 100+ supported
Quick Presets
Custom Settings
Ignored for PNG (lossless)
Wider images are scaled down
Processed in parallel — typically ~50 images per 10 seconds.
Working…
Frequently Asked Questions
- Does the bulk image optimizer upload my files to a server?
- No. Every image is processed entirely in your browser using the Canvas API and packaged into a ZIP with JSZip. No image ever leaves your device — there is no server-side component involved.
- What is the difference between WebP and AVIF formats?
- WebP typically saves 25-35% over JPEG and is supported by all modern browsers since 2020. AVIF goes further with 50% smaller files than JPEG, but encoding support is newer — it works in Chromium-based browsers and recent Firefox but not yet in Safari for writing.
- How many images can I process at once?
- You can process batches of 100+ images at once. The tool processes up to four images in parallel to keep things fast without freezing your browser. Typical speed is around 50 images per 10 seconds depending on your device.
- How does the bulk image conversion work?
- Each image is read into your browser's memory, drawn onto a hidden canvas, re-encoded using the browser's native image encoder in your chosen format (WebP, AVIF, JPEG or PNG), and packaged into a ZIP file. Everything runs entirely in your browser with no uploads.
- Is the bulk image optimizer free? Are there usage limits?
- The tool is completely free with no usage limits, no sign-up, and no watermarks. Since all processing happens locally in your browser, the only practical limit is your device's available memory and processing power.