Image Compressor

Compress images in your browser — no upload to any server.

Generator

Upload an image from your device. Choose output format (JPEG, WebP, or PNG) and quality level. The tool compresses the image in your browser and shows the new file size — no data is sent to any server. Download the compressed image when you are satisfied.

About Image Compressor

Large image files slow down web pages, use more storage, and take longer to share. This tool reduces image file size by re-encoding the image at a lower quality or in a more efficient format — all inside your browser using the HTML5 Canvas API. Your files never leave your device, so you can compress screenshots, photos, or graphics without privacy concerns.

How to use

  1. Click Select image and choose an image from your computer or phone.
  2. Pick the Output format: JPEG or WebP for photos (smaller size), PNG for graphics or when you need lossless quality.
  3. Move the Quality slider. Watch the "Compressed" file size and the preview; adjust until you are happy with the trade-off.
  4. Click Download Compressed to save the result.

When to use

  • Reducing photo size before emailing or uploading to a site
  • Optimizing images for a website or blog to improve load speed
  • Creating thumbnails or smaller versions for social media
  • Freeing up space on your device without losing the original

Details

JPEG and WebP use lossy compression: some detail is discarded to achieve smaller files. PNG is lossless — no quality loss, but file size may stay large for photos. For best size reduction on photos, use JPEG or WebP with quality between 0.7 and 0.85.

Frequently Asked Questions

Is my image uploaded to a server?
No. Compression happens entirely in your browser using the HTML5 Canvas API. Your image is read locally, redrawn on a canvas, and re-encoded at the chosen quality. Nothing is sent to our or any other server — ideal for private or sensitive photos.
What formats are supported?
You can load any image your browser supports (JPEG, PNG, WebP, GIF, BMP, etc.). For output you can choose JPEG (best for photos, smaller size), WebP (modern, good compression), or PNG (lossless, best for graphics with sharp edges or transparency).
How does the quality slider work?
The slider goes from 0.1 to 1.0. Lower values produce smaller files but may show visible quality loss (e.g. blockiness or banding). Higher values keep quality closer to the original but with a larger file. For photos, 0.7–0.85 is often a good balance.
Why is my compressed image larger than the original?
If you choose PNG output or set quality to 1.0, the result can be larger than the original because we re-encode from the decoded pixels. For maximum size reduction, use JPEG or WebP with a quality around 0.75–0.85.