Image Compressor

Compress images instantly in your browser. Reduce file sizes without losing quality. Private, no uploads.

Upload Image

📁
Click to select or drag & drop an image
Supports JPEG, PNG, WebP — up to ~50MB

About this Image Compressor

This tool compresses images entirely in your browser using the Canvas API. No images are uploaded to any server. Supports JPEG, PNG, and WebP formats with adjustable quality and resize options.

📘 How to use
  • Upload — click the upload area or drag & drop an image (JPEG, PNG, WebP).
  • Adjust quality — use the slider (10-100%) to control compression level.
  • Resize (optional) — choose to resize to 75%, 50%, or 25% of original dimensions.
  • Choose format — select JPEG, PNG, or WebP as the output format.
  • Compress — click Compress to process the image.
  • Download — click Download to save the compressed image.
❓ When to use each format
  • JPEG — best for photographs, complex images with gradients. Smaller file sizes but lossy.
  • PNG — best for screenshots, graphics, text, transparent backgrounds. Lossless but larger files.
  • WebP — modern format with excellent compression. Works in all modern browsers.

Related: Password Generator . JSON Formatter . EMI Calculator

Frequently Asked Questions

Is this tool free to use?

Yes. All UpTools tools are completely free, with no sign-ups required.

Are my images uploaded to a server?

No. All compression happens locally in your browser using the Canvas API. No data leaves your device.

What quality setting should I use?

For photos, 70-80% quality usually provides a good balance between file size and visual quality. For graphics, 80-90% works well.

Can I compress multiple images at once?

Currently this tool processes one image at a time. You can compress multiple images by repeating the process.

Does it work on mobile?

Yes. The tool is fully responsive and works on phones, tablets, and desktops.

📐 How This Tool Works

This tool uses the HTML5 Canvas API to redraw images at the specified quality and dimensions. The compressed image is then converted to a Blob using canvas.toBlob().

All processing is client-side — no server is involved. Your images never leave your device.

Also try: Password Generator · JSON Formatter · EMI Calculator

✅ Do's and ❌ Don'ts for Image Compression

✅ Do's

  • ✅ Do use WebP format for best compression.
  • ✅ Do compress before uploading to websites.
  • ✅ Do use 70-80% quality for photos.
  • ✅ Do resize to target dimensions before compressing.
  • ✅ Do keep original files as backups.

❌ Don'ts

  • ❌ Don't compress images that will be printed at large sizes.
  • ❌ Don't use very low quality (<30%) for important images.
  • ❌ Don't convert lossy → lossy repeatedly (generation loss).
  • ❌ Don't expect the same compression for every image type.
  • ❌ Don't compress screenshots as JPEG — use PNG or WebP.

More Questions

Why is WebP better?

WebP uses advanced encoding that typically produces 25-34% smaller files than JPEG at equivalent quality. It's supported by all modern browsers.

Can I compress GIFs?

This tool supports JPEG, PNG, and WebP. For GIF compression, use dedicated GIF tools.

What about transparent backgrounds?

For transparent images, use PNG or WebP format. JPEG does not support transparency.