Image Compressor

Balance image dimensions and file size with MiniWebtool’s Image Compressor. Batch processing supports JPEG, PNG, and WebP output, with visual comparisons to inspect the result and ZIP download for collecting the processed files.

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Help me understand MiniWebtool's Image Compressor: https://miniwebtool.com/image-compressor/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

3 free uses dailyNo sign-up requiredUpdated Oct 2026

Image CompressorTry it now — free ▼

Too big to email? 4.8 MB → 620 KB, and it looks the same

Drag the quality slider or pick a target such as Under 1 MB or Under 100 KB. Compress a whole batch and download one by one or as a ZIP.

📸

Drop images here or click to browse

Upload one or multiple images for batch compression

JPG PNG GIF WebP BMP

🔒 100% Private — images never leave your device

⚙ Compression Settings

Output Format

Quality Lower = smaller file

Recommended: 70-85 for web, 85-95 for print

Target File Size Optional — overrides quality

Finds the highest quality that fits and shrinks the image only if it has to.

Max Dimension Optional resize

px (longest side)

Processing...

📊 Compression Summary

Images

Original Total

Compressed Total

Total Saved

Embed Image Compressor Widget

About Image Compressor

Welcome to the Image Compressor — a powerful, browser-based tool that reduces image file sizes while maintaining visual quality. Whether you are optimizing images for a website, preparing photos for email, or freeing up storage space, this tool processes everything locally in your browser for complete privacy.

At a Glance

Image Compressor shrinks JPG, PNG, GIF, WebP and BMP images to the file size or quality you choose. It works in your browser and shows how much space each image saved.

Image Compressor: features at a glance
Feature	What you get	Good for
Target file size	Compress to under 20 KB, 50 KB, 100 KB, 200 KB, 500 KB, 1 MB or 2 MB, or to any size you type. 1 KB is counted as 1,000 bytes.	Upload forms with a size cap, such as job applications, exam portals and visa photos
Quality control	A quality slider from 10 to 100, plus Photo High (95), Web Optimal (80) and Mobile (60) presets.	Trading a little detail for a much smaller file
Output format	Save as JPEG, PNG (keeps transparency) or WebP.	WebP for websites; PNG for logos and screenshots with a transparent background
Resize while compressing	Set a maximum width or height and larger images are scaled down in proportion.	Phone photos far bigger than a web page or email needs
Batch compression	Compress up to 10 images at once on the free plan, or 50 on Pro. Download images one by one, or the whole batch as a ZIP on Pro.	Product photo sets and blog image folders
Before-and-after check	A slider compares each result with the original, next to the old size, the new size and the percentage saved.	Checking that text and faces still look sharp before you download
Privacy	Images are compressed in your browser and never uploaded to a server.	Personal photos, ID scans and client work

How to Compress Images

Upload images: Drag and drop your images into the upload area, or click to browse. You can upload multiple files at once for batch processing.
Choose output format: Select JPEG for maximum compression, PNG for lossless quality with transparency, or WebP for modern browsers with excellent compression.
Adjust quality: Use the slider to set compression level (10-100). Lower values produce smaller files with more compression artifacts. Use the quick presets for common use cases.
Optional resize: Set a maximum dimension to proportionally resize oversized images while compressing.
Compress and download: Click "Compress" to process all images. Review results with visual savings gauges, then download individually or as a ZIP file.

Output Format Comparison

Image Compressor: Output Format Comparison
Format	Best For	Transparency	Compression
JPEG	Photos, web images	No	Excellent lossy compression
PNG	Graphics, screenshots	Yes	Lossless, larger files
WebP	Modern web	Yes	Superior to JPEG and PNG

Quality Settings Guide

90-100%: Maximum quality — minimal compression, best for archival or print-quality images.
75-89%: High quality — good balance for photography and detailed images. Recommended for most uses.
50-74%: Medium quality — noticeable compression but acceptable for web thumbnails and social media.
10-49%: Low quality — maximum compression. Suitable for quick previews or when file size is critical.

Tip: For web images, 70-80% quality typically reduces file size by 60-80% with minimal visible quality loss. Use the before/after comparison slider to check quality before downloading.

Why Compress Images?

Website Performance

Images typically account for 50-65% of a web page's total size. Compressing images can dramatically improve page load times, which directly affects user engagement, bounce rates, and search engine rankings. Google's Core Web Vitals specifically penalize pages with large, unoptimized images.

Storage and Bandwidth

Compressed images consume less storage space on your device and less bandwidth when shared via email or messaging. A photo reduced from 5 MB to 500 KB loads 10x faster and uses 10x less data.

Email Attachments

Most email services limit attachment size to 10-25 MB. Compressing images ensures your photos fit within these limits without sacrificing too much visual quality.

Frequently Asked Questions

Is this image compressor free to use?

Yes. Free visitors get 3 compression runs a day, and each free batch can contain up to 10 images, while Pro allows up to 50 images per batch and Premium has no limit on images per batch; re-compressing the same images with different settings does not count again. Downloading a batch as one ZIP is a Pro feature, while each image can always be downloaded on its own. All processing happens in your browser, so your images are never uploaded to any server.

What image formats are supported?

You can upload JPG, PNG, GIF, WebP, BMP, and other common image formats. You can choose to output as JPEG (best compression), PNG (lossless with transparency), or WebP (modern format with excellent compression).

Are my images uploaded to a server?

No. All image compression is performed entirely in your browser using the JavaScript Canvas API. Your images never leave your device, ensuring complete privacy and security.

What quality setting should I use?

For web images, 70-80% quality offers the best balance of file size and visual quality. For photography or print, use 85-95%. Below 60% you may notice visible artifacts. The tool shows a real-time comparison so you can judge the quality yourself.

Can I resize images while compressing?

Yes. You can set a maximum dimension (width or height) and the tool will proportionally resize any image that exceeds that limit while maintaining the original aspect ratio. This is useful for preparing images for web upload where specific size limits apply.

How do I compress an image to a specific size, like 100 KB?

Choose a Target File Size, such as Under 100 KB, and press Compress. The tool tries qualities until it finds the highest one that fits, and only makes the image smaller in pixels if even a low quality is still too big. It counts 1 KB as 1,000 bytes, so the result also passes upload forms that count 1,024. For the smallest files choose WebP or JPEG; PNG is lossless, so resizing is the only way to shrink it.

Reference this content, page, or tool as:

"Image Compressor" at https://MiniWebtool.com/image-compressor/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: October 7, 2026

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