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Image Compressor

Compress JPG, PNG, WebP and GIF without visible quality loss. Everything runs in your browser — your images never leave your device.

Drop images here

or click to browse — up to 20 images at once

JPG PNG WebP GIF
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Original size
→
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Compressed size
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Total saved
Quality
82
Higher = better quality, larger file. 75–85 is the sweet spot.
Output Format
Original
JPG
PNG
WebP

About This Tool

How to Compress an Image

  1. 1Drop or select your image — JPG, PNG, and WebP are supported.
  2. 2Adjust the quality slider. For most web images, 75–85% delivers 50–80% file size reduction with no visible quality loss. Lower settings compress further but may introduce artifacts on photos.
  3. 3A side-by-side preview shows the original vs. compressed image alongside the file size savings before you commit.
  4. 4Click Download when you're happy with the result. Everything runs locally — nothing is uploaded.

When to Compress an Image

Web Performance & SEO
Image compression is the single highest-impact optimization for slow websites. Our guides on compressing images for the web and why websites are slow cover the direct connection to Core Web Vitals and search rankings.
Email Attachments
Most email providers cap attachments at 10–25MB. Compressing photos before attaching avoids bounce-backs and makes messages load faster for recipients on mobile.
CMS & Platform Uploads
WordPress, Shopify, Squarespace, and most platforms re-compress images on upload, but compress first for better control over the final output quality and to avoid server-side artifacts.
Mobile & Low-Bandwidth Users
Visitors on mobile data plans or slow connections abandon pages with heavy images. Compressed images load faster across the board and reduce data costs for your users.

Why Compress in the Browser

This tool compresses images entirely in your browser using the Canvas API — your files never touch a server. For the best results, always resize to your target display size before compressing — there's no point compressing a 4,000px image that will only ever display at 800px. For processing many images at once, our Bulk Compressor handles batches efficiently. And if you want to go further with file size reduction, converting to WebP format typically saves an additional 25–35% on top of JPG compression at the same quality setting. See our complete image SEO guide for a full optimization workflow.

Frequently Asked Questions

Our compressor uses the browser’s built-in Canvas API to re-encode your image at your chosen quality level. For JPG and WebP, this reduces file size by discarding fine detail the human eye barely notices. For PNG, lossless compression is applied. Nothing is sent to any server — all processing happens locally on your device.

For most web images, a quality of 75–85 is the sweet spot — you’ll get 60–80% file size reduction with no visible quality difference to the naked eye. For print or archival work, use 90+. For social media thumbnails and blog images, 70–80 is perfectly fine.

Completely safe. ImageToolShack processes all images entirely within your browser using JavaScript — no image data is ever transmitted to our servers. You can even use this tool offline once the page has loaded.

JPG — best for photos. Lossy compression produces very small files but doesn’t support transparency.

PNG — best for graphics, logos, screenshots. Supports transparency. Larger files than JPG.

WebP — Google’s modern format. Smaller than both JPG and PNG at similar quality. Supports transparency. Recommended for web use.

You can compress up to 20 images at a time with no individual file size limit — though very large files (50MB+) may be slow depending on your device. Since processing is done in your browser, performance depends on your device’s CPU and available memory.
Need more design power?
PaintShop Pro gives you full control over export quality and format settings, including batch processing for large photo libraries.
Try PaintShop Pro
Pro Tips
1
Use WebP format for web images — it’s 25–35% smaller than JPG at the same quality.
2
A quality setting of 75–82 is virtually indistinguishable from the original to the human eye.
3
Compressing images before uploading to your website can dramatically improve page speed and SEO ranking.
4
Use PNG for logos and graphics with transparent backgrounds — JPG doesn’t support transparency.
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Image Resizer
WebP Converter
Bulk Compressor
Social Media Resizer
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