What image formats can I compress?

This tool supports JPEG and PNG image formats for uploading. All images will be converted to JPEG format upon compression.

Are my images uploaded to a server?

No, all image processing and compression happen directly in your web browser. Your images are not uploaded to any external server, ensuring your privacy and data security.

How does the quality slider work?

The quality slider ranges from 0.05 (highest compression, lowest quality) to 1.0 (lowest compression, highest quality). A lower value will result in a smaller file size but may reduce image detail.

Is there a file size limit for uploads?

Since processing is done in your browser, there's no strict server-side limit. However, very large images (e.g., over 20-30MB) might perform slowly.

What is the best quality setting to use?

For web use, a quality between 0.7 (70%) and 0.85 (85%) often provides a good balance between file size reduction and visual quality.

WebP vs PNG: Which Format for Graphics & Transparency? | iCompressImg

Choosing between WebP and PNG for graphics, logos, and images with transparency is a common challenge. WebP offers significant file size advantages while PNG remains the universal standard for lossless graphics. Here's everything you need to know to make the right choice.

📊 WebP vs PNG Quick Comparison

Feature	WebP	PNG
Compression	Lossy & Lossless	Lossless only
Transparency	✅ Full alpha	✅ Full alpha
File Size (Lossy)	25-35% smaller	Baseline
File Size (Lossless)	26% smaller	Baseline
Browser Support	97%	100% universal
Animation	✅ Supported	❌ Not supported
Best For	Web graphics, photos	Print, editing, archives

🎯 When WebP is the Better Choice

WebP excels for:

Website graphics - Logos, icons, buttons with transparency
Performance-critical sites - Where file size matters most
Modern web development - When browser support is acceptable
E-commerce product images - Transparent product shots
Blog and content images - Graphics with text overlays
Mobile-optimized sites - Bandwidth savings add up

Real Example - Logo File Size:

PNG-24 (original)	156 KB
WebP lossy (80%)	24 KB (84% smaller)
WebP lossless	118 KB (24% smaller)

🔴 When PNG is Still Better

PNG remains the choice when:

Maximum compatibility needed - Every browser, device, and tool
Print materials - Lossless quality for print production
Image editing - PNG is lossless, WebP loses quality on re-save
Archival purposes - Preserving original quality
Technical drawings - Sharp lines stay crisp
Screenshots with text - Text remains razor-sharp
Client deliverables - Some clients require PNG format

PNG Advantages That Matter:

Lossless compression - quality never degrades
ICC color profile support for color accuracy
Every graphics software supports PNG
Safe for repeated editing and saving
Works in email, documents, presentations

📝 Transparency Handling

Both formats handle transparency well, but there are differences:

WebP Transparency

8-bit alpha channel (like PNG)
Smaller file size than PNG at same quality
Partial transparency supported
No browser issues with modern support

PNG Transparency

PNG-24 supports 8-bit alpha
PNG-8 supports 1-bit transparency
Universal compatibility
Better for print (no alpha channel)

For Web:

Use WebP for transparent web graphics when possible. For email or legacy browser support, stick with PNG-24.

💡 Best Practice: Use Both

The smart approach is using WebP as primary with PNG fallback:

<picture>
  <source srcset="logo.webp" type="image/webp">
  <source srcset="logo.png" type="image/png">
  <img src="logo.png" alt="Company Logo" width="200" height="100">
</picture>

Modern browsers get WebP (smaller, faster), older browsers get PNG.

📊 Practical File Size Examples

Image Type	PNG Size	WebP Lossy	WebP Lossless
Logo with text (200×80)	45 KB	8 KB	32 KB
Icon set sprite (500×500)	180 KB	42 KB	135 KB
Screenshot (800×600)	520 KB	95 KB	380 KB
Transparent product (1000×1000)	2.1 MB	340 KB	1.5 MB

✅ Decision Guide

Choose WebP when:

Building a modern website with 97%+ browser coverage
Page speed and file size are priorities
You need animation (WebP animated supported)

Choose PNG when:

Universal compatibility is required
Image will be edited multiple times
Preparing content for print
Client or platform specifically requires it

WebP vs PNG: Complete Format Comparison