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Image Compressor & Resizer

LOCAL · Browser-Only

Compress, resize, convert, and compare images - with batch processing and optional Cloudinary optimization

Drop images here

or browse files

JPEG, PNG, WebP, AVIF - up to 100 MB, batch up to 20 images

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What is Image Compressor & Resizer?

Image compressor and resizer that runs entirely in your browser - no upload to any server required.

Unlike TinyPNG, Squoosh, and other popular image compressors that send your photos to remote servers for processing, this tool uses the HTML5 Canvas API to compress and resize images directly on your device. Upload any JPEG, PNG, or WebP image and adjust the output dimensions, quality level, and format. The tool shows a live comparison of original vs compressed file size so you can find the perfect balance between quality and file size. Your images never leave your device, making it safe for personal photos, client work, and confidential screenshots. No signup, no watermarks, no file limits.

How to Use Image Compressor & Resizer

1Upload an image by clicking the upload area or dragging and dropping a JPEG, PNG, or WebP file
2Adjust the output dimensions (width and height) and enable 'Lock aspect ratio' to scale proportionally without distortion
3Set the compression quality level using the slider - lower values produce smaller files, higher values preserve more detail
4Choose your output format (JPEG, PNG, or WebP) and click 'Download' to save the compressed image to your device

Frequently Asked Questions

How does browser-based image compression work?

The tool uses the HTML5 Canvas API to decode your image, optionally resize it, and re-encode it at a lower quality setting. For JPEG and WebP formats, reducing quality removes fine detail the human eye barely notices, often cutting file size by 50-80% with minimal visible difference.

Which image formats are supported?

You can upload JPEG, PNG, and WebP images. The output can be saved as JPEG (best compression for photos), PNG (lossless, best for graphics with transparency), or WebP (modern format with excellent compression and quality).

Are my images uploaded to a server?

No. All compression and resizing happens entirely in your browser using JavaScript and the Canvas API. Your images never leave your device, making this tool completely safe for sensitive photos, client work, and confidential screenshots.

What is the best quality setting?

For most photos, a quality of 70-80% provides an excellent balance between file size and visual quality. For web thumbnails, 60% is usually sufficient. For print or high-quality archives, use 90% or above.

Is this a free alternative to TinyPNG?

Yes. TinyPNG uploads your images to their servers for compression and has a free tier limit of 500 images per month. ToolBox compresses images client-side in your browser with no limits, no account required, and no data ever leaving your device.

Can I resize images to specific dimensions?

Yes. Enter your target width and height in pixels, or lock the aspect ratio and change one dimension to have the other adjust automatically. This is useful for preparing images for social media, website banners, or email newsletters that require specific sizes.

How much can I reduce the file size?

JPEG and WebP images can typically be reduced by 50-80% at quality settings between 60-80% with minimal visible difference. PNG files compress less dramatically since PNG is a lossless format, but resizing large PNGs can still cut file size significantly.

Why is compressing images without uploading safer?

When you upload images to a server-based compressor, your photos pass through third-party infrastructure where they could be stored, cached, or accessed. ToolBox processes everything locally in your browser, so your images never touch any external server. This is especially important for personal photos, medical images, or anything containing sensitive information.

How do I compress an image to a specific file size in KB?

Lower the quality slider step by step and watch the live output size update. Combine quality reduction with a smaller width and height to hit a target like 100KB. The before-and-after size readout lets you fine-tune until the file fits the limit an email or upload form requires.

Can I compress images for social media or email?

Yes. Resize to the platform's recommended dimensions, set quality to around 70-80%, and export as JPEG or WebP. This produces a small file that uploads quickly and stays under common attachment limits without a visible drop in quality.

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What is Image Compressor & Resizer?

Image compressor and resizer that runs entirely in your browser - no upload to any server required.

How to Use Image Compressor & Resizer

1Upload an image by clicking the upload area or dragging and dropping a JPEG, PNG, or WebP file

2Adjust the output dimensions (width and height) and enable 'Lock aspect ratio' to scale proportionally without distortion

3Set the compression quality level using the slider - lower values produce smaller files, higher values preserve more detail

4Choose your output format (JPEG, PNG, or WebP) and click 'Download' to save the compressed image to your device