Compressor de Imagens Online

What is an Image Compressor?

An image compressor is a tool that reduces the file size of digital images while maintaining acceptable visual quality. Our free online image compressor uses advanced algorithms to compress JPG, PNG, and WebP images up to 90% smaller, perfect for faster website loading, reduced storage costs, and optimized bandwidth usage. All compression happens securely in your browser.

How to Use This Image Compressor

1. Upload Image: Drag and drop your image or click to browse. Supports JPG, PNG, GIF, and WebP formats.
2. Choose Format: Convert to JPEG, PNG, or WebP, or keep the original format.
3. Adjust Quality: Use the quality slider to balance file size and visual quality (higher = better quality, larger file).
4. Resize (Optional): Reduce dimensions by percentage, width, height, or exact dimensions.
5. Process: Click "Compress Image" to see instant results with before/after comparison.
6. Download: Save your optimized image and compare file size reduction.

Image Format Guide

JPEG (JPG)

• Best for: Photographs, complex images with many colors
• Compression: Lossy (some quality loss)
• Transparency: Not supported
• Typical use: Photos, product images, backgrounds
• Recommended quality: 75-85% for web, 90-95% for print

PNG

• Best for: Graphics, logos, images with transparency
• Compression: Lossless (no quality loss)
• Transparency: Supported (alpha channel)
• Typical use: Logos, icons, graphics with text, screenshots
• File size: Larger than JPEG for photos

WebP

• Best for: Modern websites requiring smallest files
• Compression: Both lossy and lossless
• Transparency: Supported
• Typical use: Web images, replacing JPEG and PNG
• Advantages: 25-35% smaller than JPEG/PNG with same quality
• Browser support: All modern browsers (95%+ coverage)

Compression Quality Settings

The quality slider controls how much compression to apply:

• 90-100%: Minimal compression, best quality, largest files. Use for print or archival.
• 80-90%: Excellent quality, good compression. Recommended for most websites.
• 70-80%: Good quality, better compression. Ideal for thumbnails and galleries.
• 50-70%: Visible quality loss, high compression. Use for previews or low-priority images.
• Below 50%: Significant quality loss. Not recommended except for placeholders.

For PNG (lossless), the quality setting doesn't affect visual quality, only file size optimization level.

Image Resize Options

By Percentage

Scale image proportionally. 50% = half the dimensions, 200% = double the size.

By Width

Set specific width in pixels, height adjusts automatically to maintain aspect ratio.

By Height

Set specific height in pixels, width adjusts automatically to maintain aspect ratio.

By Exact Dimensions

Set both width and height. Image will be cropped or stretched to fit exact dimensions.

Tip: Resizing before compression can dramatically reduce file size. A 4000×3000 photo resized to 1200×900 can be 10x smaller.

Common Use Cases

Website Optimization

Compress images for faster page loading. Aim for under 100KB per image for hero images, under 50KB for content images.

Email Attachments

Reduce image size to fit email size limits. Most email providers limit attachments to 20-25MB.

Social Media

Optimize images for platforms like Instagram, Facebook, Twitter. Each has recommended dimensions and file sizes.

Mobile Apps

Reduce app size and improve performance by compressing bundled images. WebP format is excellent for mobile.

Storage Savings

Free up disk space by compressing photo libraries and archives without visible quality loss.

Privacy and Security

Your images are completely private and secure. All compression and conversion happens entirely in your browser using JavaScript and HTML5 Canvas. Your images are never uploaded to our servers or transmitted over the internet. They stay on your device at all times.

Frequently Asked Questions

Does compression reduce image quality?

It depends on the format and settings. PNG uses lossless compression (no quality loss). JPEG and WebP use lossy compression (some quality loss) but at 80-90% quality, the difference is barely noticeable to human eyes.

What's the best format for my images?

Use JPEG for photos, PNG for graphics/logos with transparency, WebP for modern websites wanting smallest files with good quality.

How much can I compress without losing quality?

For JPEG/WebP, 85% quality typically provides excellent results with 50-70% file size reduction. Beyond that, compression artifacts may become visible.

Should I resize before or after compression?

Resize first, then compress. This gives better file size reduction and quality results.

Can I compress images multiple times?

Technically yes, but with lossy compression (JPEG/WebP), each compression degrades quality further. Compress once from the original for best results.

What's the maximum image size I can compress?

The tool can handle very large images, but browser memory limits may apply (typically 50-100MB depending on your device).

Why is my PNG bigger after compression?

PNG is lossless. If converting from JPEG to PNG, file size increases. Convert to WebP or keep as JPEG for smaller files.

Technical Details

This image compressor uses HTML5 Canvas API for client-side image processing. JPEG and WebP compression use quality-based encoding. PNG compression uses optimal color palette and lossless algorithms. All processing is performed in-browser with no server uploads required.