Bulk Image Resizer — Free Online Tool
Resize up to 20 images at once — download all as ZIP. · No signup · Works on mobile
100% private: your files are processed in your browser. Nothing is uploaded to our servers.
How to use the bulk image resizer
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Drop up to 20 images at once (or click to select multiple).
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Set the target: max width/height in pixels or a percentage scale, plus output format and quality.
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Click Resize All and download the ZIP containing every resized image.
What does this tool do?
This free bulk image resizer processes up to 20 images at once — set one target size (max dimension or percentage) and every image is resized in your browser, then downloaded together as a single ZIP file. No queues, no per-file clicking, no uploads.
How does the bulk image resizer work?
Each image is resized sequentially on a Canvas with multi-step high-quality downsampling, re-encoded to your chosen format, and streamed into a ZIP archive built client-side with JSZip. A progress bar tracks each file; 20 phone photos typically finish in under 15 seconds.
Frequently Asked Questions
Why is there a 20-image limit?
Because processing happens in your browser's memory, 20 full-resolution photos (~100–200 MB decoded) is a safe ceiling for typical devices. Need more? Run multiple batches — there's no total or daily cap. On a powerful desktop, batches complete in seconds each.
Will all images come out the same exact size?
"Max dimension" mode scales each image to fit within your limit while keeping its own aspect ratio — so a portrait and a landscape both fit 1600 px but keep their shapes. Percentage mode scales each image relative to its own size. Aspect ratios are never distorted.
Is the bulk image resizer really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. No account or email needed. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Are my files private when using the bulk image resizer?
Completely. The bulk image resizer processes everything locally in your browser — your files are never uploaded to any server. When you close the tab, everything is gone. This makes it safe for confidential documents, client work, and personal photos.
Does the bulk image resizer work on mobile phones?
Yes. It's built mobile-first and works on any modern phone browser — iPhone (Safari) and Android (Chrome) included. You can pick files straight from your camera roll and download results directly to your device.
Do I need to install any software to use the bulk image resizer?
No. The bulk image resizer runs entirely in your web browser — no downloads, extensions, or signup. Open the page, use the tool, download your result. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.