Image Resizer
Resize and compress images online — free, instant, and private. Upload any image, set your target dimensions or percentage, adjust quality, and download. Everything runs in your browser.
🖼️
Drop an image here or click to browse
Supports JPEG, PNG, WebP, GIF, BMP
JPEG vs. PNG — Which Format to Choose?
JPEG — Best for photos
- Lossy compression — smaller file size
- 85% quality: 3–5× smaller, no visible loss
- Does not support transparency
- Ideal for: photographs, social media, web banners
PNG — Best for graphics
- Lossless compression — no quality loss
- Larger file size than JPEG
- Supports transparency (alpha channel)
- Ideal for: logos, screenshots, UI graphics
Tips for Reducing Image File Size
- Use JPEG for photos at 80–90% quality. The human eye cannot detect compression artefacts above 80%. Files are typically 3–5× smaller.
- Resize to the display size. If an image is shown at 800px wide on your site, there is no benefit to uploading a 3000px original.
- Avoid upscaling. Enlarging an image beyond its original size adds file size without adding detail — it only blurs.
- PNG for transparency, JPEG for everything else. Choosing PNG for a photograph can result in a file 5–10× larger than JPEG with no visible benefit.
- Standard web widths. 1920px for full-width hero images, 1280px for content images, 800px for thumbnails and article photos.
Frequently Asked Questions
How do I resize an image without losing quality?▾
Use PNG format (lossless) for graphics, logos, and images with text. For photographs, JPEG at 80–90% quality is visually indistinguishable from the original at significantly smaller file size. Avoid resizing up (enlarging) — this always reduces sharpness since the tool must interpolate new pixels.
What image formats does this tool support?▾
You can upload any common image format (JPEG, PNG, WebP, GIF, BMP). The output is JPEG or PNG. JPEG is best for photographs (smaller file, slight compression). PNG is best for screenshots, logos, and images requiring transparency.
Does this tool send my images to a server?▾
No. All processing happens entirely in your browser using the HTML5 Canvas API. Your images are never uploaded, stored, or transmitted anywhere. This also means the tool works offline after the page loads.
What does the quality slider do?▾
The quality setting only applies to JPEG output. It controls the compression level — higher quality means less compression and a larger file. At 85% quality, JPEG images are typically 3–5× smaller than the original with no visible difference. The quality slider has no effect when PNG output is selected (PNG is always lossless).
What is the maximum image size I can resize?▾
There is no strict limit, but very large images (over 20 megapixels) may be slow to process depending on your device. For best performance, images under 10 MB or 10 megapixels process instantly. The tool processes entirely in your browser's memory.
Can I resize multiple images at once?▾
Currently, this tool processes one image at a time. For batch resizing, you can process each image individually or use desktop software like GIMP (free) or Photoshop for batch operations.
Why does my resized image look blurry?▾
Blurriness usually occurs when enlarging a small image (upscaling). If the target dimensions exceed the original, the browser must invent pixels — this is called interpolation and always reduces sharpness. For sharp results, either keep dimensions at or below the original, or use AI upscaling tools like Adobe Enhance or Topaz Gigapixel.