Image Compressor

Reduce image file sizes in-browser with adjustable quality and optional resizing. No uploads, instant results.

Compress JPEG, PNG, WebP images in your browser. Free online image compressor with quality slider, batch support, and no file uploads.

About Compress Image

Reduce image file sizes in-browser with adjustable quality and optional resizing. No uploads, instant results.

Drag or select an image, choose quality (10–100%), optional max dimensions, and output format. The tool renders the image to a canvas at the target size, then exports via canvas.toBlob() at the chosen quality.

All processing happens locally in your browser — no files leave your device. Works with JPEG, PNG, WebP, and more. Batch multiple files by repeating the process.

Where it is used

Web developers optimizing assets, bloggers compressing photos, anyone reducing image sizes for email or web.

How to use the Compress Image

  1. Quality (%) — enter the value.
  2. Max Width (px, 0 = original) — enter the value (e.g. 1920).
  3. Max Height (px, 0 = original) — enter the value (e.g. 1080).
  4. Output Format — enter the value.
  5. Calculate — press the Calculate button to see the result instantly above.

Formula

Canvas drawImage at target quality + toBlob() with quality parameter.

Examples

Example

quality:80
maxWidth:1920
maxHeight:1080
format:auto
Result: Original 2.4 MB → Compressed 640 KB (73% smaller)

Frequently Asked Questions

Does quality 80 look good?
Yes, 75–85 is the sweet spot for JPEG/WebP — visually near-lossless but 50–80% smaller. PNG is lossless; quality slider only affects JPEG/WebP.
Can I compress multiple images?
Process them one by one — each takes under a second. For true batch, use a CLI tool like imagemin or Sharp.
Does it strip EXIF?
Yes, <code>toBlob()</code> strips metadata. If you need EXIF preserved, use a dedicated tool.
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