🖼️ Image & File

Image Compressor

Reduce image file size with adjustable quality, resize, and format conversion. Side-by-side comparison — nothing uploaded, all in your browser.

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Click to upload or drag & drop an image

JPG, PNG, or WebP — any size your browser can handle

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75%

Applies to JPEG & WebP output. PNG is lossless.

How it works

The image is loaded into your browser and drawn onto a hidden HTML Canvas. The Canvas API's toDataURL() method re-encodes the image using the browser's built-in JPEG or WebP encoder at the quality level you specify. If you set max width/height, the image is resized before encoding. The compressed result is shown alongside the original for comparison. Nothing is uploaded — all processing happens in your browser.

Why the Image Compressor is Useful

Page speed is a direct ranking factor on Google, and oversized images are the single most common reason websites load slowly. A 3 MB hero image from a smartphone camera can be compressed to under 200 KB at the same visible quality — a 15× reduction that dramatically cuts load time. This tool handles that compression entirely in your browser, so you get instant results without uploading your photos to an unknown server, which is especially important for confidential or sensitive images.

Key Features

  • Adjustable quality slider: Fine-tune compression from 10% to 100% to find the sweet spot between file size and visual clarity
  • Format conversion: Convert between JPEG, WebP (recommended for web), and PNG lossless in one step
  • Resize dimensions: Set max width and max height to downscale oversized images before compressing
  • Side-by-side comparison: Original and compressed images shown together with file size statistics
  • Privacy-first: No uploads — everything runs in your browser using the Canvas API
  • One-click download: Save the compressed file instantly with a sensible filename

Real-Life Use Cases

  • Compressing product photos before uploading to an e-commerce store to improve page load speed and Core Web Vitals scores
  • Reducing blog post images so they meet the under-200 KB guideline recommended by Google PageSpeed Insights
  • Shrinking photos before attaching to emails where attachment size limits apply
  • Converting PNG screenshots to WebP to reduce file size by 30–50% for use in web projects
  • Resizing and compressing images exported from design tools like Figma or Canva before publishing to social media

Who Can Use This Tool

Web developers, bloggers, e-commerce store owners, social media managers, photographers, and anyone who regularly works with images online. It is also useful for students submitting assignments with image size restrictions, and for anyone who needs to quickly reduce an image's size before sending it via messaging apps.

Tips & Best Practices

  • For photographs, use WebP at 75–85% quality — this achieves around 60–70% file size reduction with barely visible quality loss
  • For screenshots and graphics with sharp text, use PNG (lossless) to avoid compression artifacts around letters and lines
  • Always set a max width matching your website's content column width — serving a 3000px image in a 800px column wastes bandwidth
  • Check the side-by-side preview at 100% zoom before downloading to verify no visible quality loss is acceptable
  • Use WebP for new web projects; fall back to JPEG only if you need compatibility with older email clients or legacy software

Frequently Asked Questions

What image formats are supported?
This tool accepts JPG, PNG, and WebP images. You can output compressed files in JPEG, WebP, or PNG format. The input and output formats are independent — you can convert a PNG to WebP, or a WebP to JPEG, for example.
Is JPEG or WebP better for compression?
WebP generally produces files 25-35% smaller than JPEG at equivalent visual quality. JPEG has broader compatibility with older software and devices, while WebP is supported by all modern browsers (Chrome, Firefox, Safari, Edge). For maximum compression on the web, use WebP. For email or print compatibility, use JPEG.
What is the difference between lossy and lossless compression?
Lossy compression (JPEG, WebP at quality < 100%) discards some image data that the human eye is less likely to notice, achieving much smaller file sizes. Lossless compression (PNG, or JPEG/WebP at 100% quality) preserves every original pixel but results in larger files. For photographs and natural images, lossy is usually fine. For screenshots, graphics with text, or images requiring pixel-perfect accuracy, use lossless PNG.
When should I compress images?
Compress images before uploading to websites to improve page load speed — Google uses Core Web Vitals as a ranking factor. Good targets: hero images under 200 KB, content images under 100 KB, thumbnails under 30 KB. Compressing before sharing via email or messaging also saves bandwidth and reduces send times.
How accurate is browser-based compression?
Browser-based compression uses the Canvas API and the browser's built-in JPEG/WebP encoders (libjpeg for Chrome, libwebp for Firefox, etc.). The quality parameter (0-1) maps directly to the encoder's quality setting — results are equivalent to what you'd get from ImageMagick, Sharp, or server-side libraries. The only limitation is that PNG output from canvas.toDataURL is always lossless, so quality settings only apply to JPEG and WebP formats.
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