What image formats does it support?

You can upload JPEG, PNG and WebP images. Output can be set to JPEG (best compression for photos), PNG (lossless, better for graphics with text), WebP (modern format, excellent compression), or Original (keeps the source format).

Is there a limit on the number of images?

There is no server-side limit. You can compress as many images as your device's RAM allows. For typical web images, dozens to hundreds of files process without issue. The ZIP is built client-side using JSZip.

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Bulk Image Compressor

Compress JPEG, PNG and WebP images in bulk — set quality level, choose output format and optional max dimension. Download all compressed images as a ZIP. Real Canvas API compression, no server uploads, no sign-up, no watermarks.

✓ JPEG / PNG / WebP ✓ Custom Quality Slider ✓ Batch Compress ✓ Download as ZIP ✓ No Server Upload ✓ No Watermarks

Upload images, set quality and format, compress all and download as ZIP

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Drop images here

JPEG, PNG and WebP supported — multiple files at once

Select Images

Processed in-browser with Canvas API · Files never uploaded to any server

🔒 Canvas API compression · No files leave your browser · JSZip for ZIP download · No server, no API

How Bulk Image Compression Works

Upload Images

Select or drop JPEG, PNG and WebP images. Thumbnails appear instantly, no uploading needed.

Set Options

Choose quality (1–100%), output format (JPEG/PNG/WebP/Original) and optional max dimension.

Canvas Compress

Each image is drawn to a canvas at the chosen size and re-encoded with canvas.toBlob() at your quality setting.

Download ZIP

JSZip bundles all compressed images into a ZIP file for instant download — or download images individually.

Frequently Asked Questions

How does the bulk image compressor work?

Each image is drawn to an HTML canvas at your chosen max dimension (or its original size if no resize is set), then the canvas is encoded to a Blob using canvas.toBlob('image/jpeg', quality) at your selected quality percentage. This is the same mechanism browsers use for all image encoding — genuine quality-based compression. No server, no external API.

What formats are supported?

Input formats: JPEG, PNG and WebP. Output formats: JPEG (best for photos — lossy, smallest files), PNG (lossless — best for graphics with transparency or text), WebP (modern format — excellent compression, supported by all major browsers), or Original (keeps the source format).

Which quality setting should I use?

For web/email images: 60–75% gives excellent compression with barely noticeable quality loss. For professional or print images: 80–90% preserves most detail. For social media thumbnails or icons: 50–65% works well. The live quality slider lets you see the setting before compressing.

Are my images uploaded to a server?

No — your images never leave your device. Canvas API compression is client-side; JSZip builds the ZIP locally in your browser. No files are sent anywhere, no server calls are made, no API keys are required.

About ToollLive Free Bulk Image Compressor

ToollLive's free bulk image compressor is the fastest way to compress multiple images online for free. Upload dozens of JPEG, PNG or WebP photos, set your quality level (1–100%), choose output format, and batch compress images simultaneously — then download all results as a single ZIP archive. This batch image compression tool uses the browser's native Canvas API for genuine quality-based image file size reduction — no server uploads, no API keys, no sign-up. The optional max-dimension setting also lets you resize and compress images in one step. Whether you need a bulk photo compressor for a website, email campaign or social media, this free tool handles it instantly in your browser. Also try Reduce PDF Size, Compress PDF and Image Converter.