Image Compressor
Shrink JPG, PNG and WebP images up to 90% smaller — compressed locally, never uploaded.
Processed on your device — nothing is uploaded
70–85% is usually indistinguishable from the original while cutting file size dramatically.
About the Image Compressor
Make photos and screenshots dramatically smaller for websites, email and social media. ToolNest re-encodes the image with your browser's own imaging engine at the quality you choose, and shows the before/after sizes live.
Your image is processed on your device with the Canvas API — it is never uploaded anywhere. No batch queues, no size caps, no watermark, no signup.
How to use the Image Compressor
- 1Drop your image into the box.
- 2Choose the output format and drag the quality slider until you like the size.
- 3Press Compress and download the optimized image.
Frequently asked questions
How does compression work?
The image is re-encoded at a lower quality level using your browser's native encoder. JPEG and WebP quality settings remove detail the eye barely notices, which cuts file size dramatically.
Which format is smallest?
Usually WebP — it is typically 25–35% smaller than JPEG at the same visual quality and supports transparency.
Is my image uploaded?
No. Compression uses your browser only; the file never leaves your device.
Related tools
Image Converter
Convert PNG, JPG, WebP, AVIF, GIF, BMP and more — in your browser, zero upload.
Image ToolsImage Resizer
Resize images to exact dimensions or popular presets — locally and free.
Image ToolsRotate & Flip Image
Rotate images 90°, 180° or 270° and flip horizontally or vertically — pixel-perfect, no upload.
Image Tools