Bulk Image Compressor & Resizer

Compress, resize & convert multiple images at once — 100% in your browser, nothing uploaded

Bulk processing | 100% private | No limits

Default Settings

Applied to all new images — override per image below
Smaller Higher quality

Drop images here

or click to browse — JPEG, PNG, WebP — select multiple files

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100% Browser-Based — Your Images Stay Private

All compression and resizing runs locally using the HTML5 Canvas API. Your images never leave your device and no data is sent to any server. You can even disconnect from the internet and the tool keeps working. Free to use with no file size limits.

Need to change image dimensions?

Try our Image Resizer — resize images by exact pixel dimensions, percentage, or longest side. Batch mode and ZIP download included.

How to Compress Images Online for Free

Reduce image file sizes in 3 simple steps — no software to install, no account required

1

Upload Your Images

Drag & drop or click to select multiple JPEG, PNG, or WebP images. Add as many as you need — there’s no limit.

2

Adjust Settings

Set global defaults or customize quality, format, and max dimensions for each image individually. Then hit “Compress All.”

3

Download Results

Download each image individually or grab everything at once as a single ZIP file. Compare before & after with the preview toggle.

Image compression reduces file size by eliminating redundant or less important data. Lossy compression (JPEG, WebP) discards visual information the human eye barely notices, achieving 60–80% reductions at moderate quality. Lossless compression (PNG) reorganizes pixel data more efficiently with zero quality loss. Combining compression with resizing — scaling pixel dimensions down to only what you need — is the most effective strategy for fast-loading websites and smaller email attachments.

Why You Should Compress Images

Optimized images improve page speed, SEO rankings, and user experience

Faster Page Load Speed

Images typically account for 50–75% of a web page’s total weight. Compressing them can reduce overall page size by 40–60%, directly improving load time, which is a confirmed Google ranking factor.

Better SEO & Core Web Vitals

Google’s Core Web Vitals (LCP, CLS) are directly impacted by unoptimized images. Compressed images improve your Largest Contentful Paint score, leading to higher search rankings and more organic traffic.

Mobile-Friendly Experience

Over 60% of web traffic comes from mobile devices on limited data plans. Smaller images mean lower data usage, faster rendering, and happier visitors who are more likely to stay and convert.

Save Storage & Bandwidth

Whether you’re hosting on a server or uploading to cloud storage, smaller files save disk space and reduce bandwidth costs. A batch of 100 photos at 80% quality can save gigabytes of storage.

JPEG vs PNG vs WebP — Which Format to Use?

Choose the right image format for websites, social media, email, and print

Feature JPEG PNG WebP
Best For Photos, complex images Graphics, logos, screenshots All-purpose web images
Compression Type Lossy only Lossless only Lossy & Lossless
Transparency No Yes (alpha channel) Yes (alpha channel)
Quality Control Adjustable (1–100) Always maximum Adjustable (1–100)
Typical File Size Small Large Smallest (25–34% less than JPEG)
Browser Support Universal Universal All modern (97%+)
Ideal Quality Setting 75–85% for web N/A (lossless) 75–85% for web

Image Optimization Best Practices for Websites

Expert tips for faster page loads and better Core Web Vitals scores

Resize Before Uploading

A 4000×3000 photo displayed at 800×600 wastes 96% of its pixels. Always resize to the largest display dimension you need. For most blog images, 1200px wide is sufficient.

Use WebP When Possible

WebP produces files 25–34% smaller than equivalent JPEG images at the same visual quality. With 97%+ browser support, it’s the best default format for web images in 2024.

Aim for <200KB Per Image

For hero images, target under 200KB. For thumbnails and content images, aim for 30–100KB. Google PageSpeed Insights recommends keeping total image weight under 500KB per page.

Quality 80% Is the Sweet Spot

At 80% quality, JPEG and WebP images are visually indistinguishable from originals for most users, but 60–80% smaller. Only go higher for product photography or portfolio work.

Frequently Asked Questions

Everything you need to know about compressing, resizing, and optimizing images

No. All image processing happens entirely in your browser using the HTML5 Canvas API. Your images never leave your device, and no data is sent to any server. You can verify this by disconnecting from the internet — the tool continues to work perfectly. This makes it ideal for compressing sensitive or private images.
There is no fixed limit. You can add as many images as your browser can handle. Each image is processed independently using your device’s memory and CPU. For very large batches, images are compressed sequentially to prevent browser freezing. Most devices handle 50–100 images without issue.
Yes. Set global defaults (format, quality, max dimensions) that apply to all images. Then click the settings icon on any individual image to override those defaults. This lets you optimize product photos at 90% quality while compressing blog images at 75%, all in the same batch.
Lossy compression permanently removes visual data that the human eye barely notices, achieving 60–80% file size reductions at moderate quality. JPEG and WebP use lossy compression. Lossless compression reorganizes pixel data more efficiently with zero quality loss. PNG uses lossless compression. For most web use, lossy at 75–85% quality is the sweet spot.
Use WebP as your default — it produces the smallest files (25–34% smaller than JPEG) with excellent quality and 97%+ browser support. Use JPEG for photos when broad compatibility matters. Use PNG only when you need transparency or pixel-perfect sharpness for logos, icons, and screenshots.
For most web images: 75–85% quality. At 80%, images are typically 60–80% smaller with no visible difference to most viewers. For product/portfolio photography, use 85–92%. For thumbnails and background images, 60–75% is often sufficient. Below 50%, compression artifacts become obvious.
After compressing your images, click the “Download All as ZIP” button in the bulk action bar. This packages all compressed images into a single ZIP file for easy download. You can also download individual images using the download button on each image card.
Yes. Set a maximum width or height in the global settings or per image. Images larger than that threshold are scaled down proportionally, maintaining the original aspect ratio. Resizing is the most effective way to reduce file size — a 4000px photo resized to 1200px can be 80%+ smaller even before compression.
At quality settings of 75% and above, the visual difference is virtually undetectable to the human eye for photographs. Even professional photographers typically can’t distinguish 85% from 100% quality in blind tests. For graphics with sharp edges or text, use PNG to avoid any quality loss.
Completely free with no limits. No file size restrictions, no watermarks, no sign-up required, and no daily usage caps. Since everything runs in your browser, the only limit is your device’s memory and processing power.