BulkResizeImages.online

Overview

BulkResizeImages.online is a free web tool that lets you batch resize, compress, and optimize multiple images directly in your browser. It processes files locally (no uploads), supports common formats, and focuses on speed, quality, and privacy.

Key Features

• Local Processing (Zero-Upload): All image manipulation happens in your browser so files never leave your device.
• Multiple Resize Modes: Resize by percentage, exact width×height, or target file size with presets for common social platforms.
• Wide Format Support: Handles JPEG, JPG, PNG, WebP, SVG, AVIF, GIF, APNG, HEIC, and HEIF.
• High-Quality Resampling: Uses Lanczos3 (via Pica) for sharp downscaling and preserves sRGB color fidelity.
• Fast Performance: Powered by WebAssembly and multi-threaded web workers to use local CPU/GPU acceleration.
• Batch Workflow: Drag-and-drop up to 50 files (up to 50MB each) and process unlimited images without accounts.

Use Cases

• Shopify store owner: Create uniform product thumbnails and reduce page load times with batch resizing and compression.
• Frontend developer: Optimize assets for web performance and Core Web Vitals without uploading to a server.
• Photographer: Prepare galleries or client previews by resizing and exporting many high-resolution photos quickly.
• Social media manager: Produce correctly sized images for different platforms using quick presets and target file-size compression.

FAQ

• Is this image resizer really free? Yes — the tool is 100% free with no watermarks, no sign-ups, and no usage limits.
• Do my images get uploaded to a server? No — processing is entirely client-side in your browser; images never leave your device.
• Which formats are supported? Common formats are supported including JPG/JPEG, PNG, WebP, SVG, AVIF, GIF, APNG, HEIC, and HEIF.
• How can I reliably reduce file size? Try exporting as WebP, lower the quality to ~80% or below, and avoid upscaling; complexity and resolution affect final size.