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Image Compressor

Reduce image file size with adjustable quality. See before/after comparison. 100% private — no server upload.

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Click to upload or drag & drop an image

PNG, JPG, WebP supported

About Image Compressor

Compress images instantly in your browser. Adjust quality level and choose between JPEG, WebP, and PNG output. WebP format typically achieves 25–35% smaller files than JPEG at the same quality. No file is ever uploaded to a server — everything runs locally.

How to Use

  1. Upload your image by clicking or dragging it onto the upload area.
  2. Choose an output format — JPEG for photos, WebP for best compression, PNG for lossless.
  3. Drag the Quality slider — lower values = smaller file, higher values = better quality.
  4. Click Compress Image to see the before/after file size comparison.
  5. Click Download to save the compressed image.

How It Works

The tool draws your image onto an HTML5 Canvas and re-encodes it using the browser's built-in codec at your chosen quality level. PNG compression is lossless, so the quality slider only affects JPEG and WebP outputs.

Frequently Asked Questions

For most use cases, 70–85% quality offers a good balance between file size and visual quality. For web images where fast loading matters, 60–75% is often sufficient. For print or archiving, use 90%+.
PNG is a lossless format — it cannot discard pixel data. The quality slider has no effect on PNG output. To significantly compress a PNG photo, switch to JPEG or WebP format instead.
WebP is a modern image format developed by Google. It typically produces files 25–35% smaller than JPEG at equivalent visual quality, and also supports transparency like PNG. All modern browsers support WebP.
No. This tool only changes the encoding quality and format, not the pixel dimensions. The output image will be the same width and height as the original. Use the Image Resizer tool if you also need to change dimensions.
Only PNG compression is lossless. JPEG and WebP compression at less than 100% quality are lossy — they remove some image data to reduce file size. At quality levels of 80%+, the difference is usually imperceptible to the human eye.

About Image Compressor

The Image Compressor reduces the file size of images without significant quality loss. Smaller images load faster, improve Core Web Vitals scores, and reduce bandwidth usage — all processed locally in your browser.

How to Use

  1. Upload an image by clicking Choose Image or dragging it in.
  2. Adjust the Quality slider (lower = smaller file, more compression).
  3. The tool shows the original vs. compressed file size and the percentage saved.
  4. Click Download to save the compressed image.

How It Works

The image is drawn onto an HTML canvas, then re-exported as JPEG with the specified quality setting (0–1). JPEG compression removes imperceptible image data — at quality 80%, file sizes are typically 60–80% smaller with minimal visual difference.

Example

A 3MB JPEG hero image at quality 80: typically compresses to 400–600KB. At quality 70 it may reach 250–400KB. For most web images, 75–85% quality is the sweet spot between file size and visual fidelity.

Frequently Asked Questions

For web images, 75–85% quality is generally optimal — significant file size reduction with no visible quality loss at normal screen viewing distances. For archival or print, use 90–95%.
Yes, but the quality slider converts PNGs to JPEG during compression. If you need lossless PNG compression (preserving transparency), use a dedicated PNG optimizer like pngquant.
Images that are already heavily compressed (like screenshots) have limited additional compression potential. PNG files can also be larger than equivalent JPEGs at the same quality level.
No. All compression happens locally in your browser using the HTML canvas API. Your image never leaves your device.