FileCompressor.online

FileCompressor.online is a free online image and file compressor that shrinks your photos and documents to the exact target size you enter in KB. Instead of guessing with a percentage slider, you simply type the required size (for example, 20 KB, 50 KB, 100 KB, or 200 KB) and the compressor optimizes the file to fit that requirement.

Compression runs 100% inside your browser using client-side processing (JavaScript and HTML5 Canvas), so your files stay private and aren’t uploaded to a remote server. You can preview quality changes with a live split-screen comparison slider before saving, making it easier to keep the results looking right for your use case.

The tool preserves your original pixel dimensions (100% width and height). It reduces invisible bloat such as camera metadata, GPS tags, and redundant data rather than downscaling your image, which helps avoid blurry, cropped, or pixelated outputs. It supports multiple formats including JPG, PNG, WebP, and GIF, so you can handle both standard images and animated GIFs.

This is especially helpful when you face strict upload limits on passport, visa, and job application portals (often 20 KB, 50 KB, or 100 KB), or when you want to send lightweight attachments over email and messaging without wasting bandwidth.

How does FileCompressor.online compress files without uploading them?

Your files are processed locally in your browser using JavaScript and HTML5 Canvas, and zero bytes leave your device. This keeps compression private for sensitive photos and official documents.

Can I set an exact output size in KB (like 20 KB or 100 KB)?

Yes. Enter the exact number of KB you need, and the compressor optimizes the file to match that target size requirement.

Will the tool change my image dimensions or make it blurry?

No. Your original width and height are preserved at 100%, so the output keeps the same pixel dimensions while removing unnecessary data to reduce file weight.

Which formats are supported for compression?

It supports JPG, PNG, WebP, and GIF, including use as a GIF compressor for animated files.

Is FileCompressor.online free, and does it add watermarks or have limits?

It’s free to use with no subscriptions, no daily limits, and it doesn’t add watermarks. You can compress as often as you like.

How do I replace a file after I’ve uploaded one?

Use the small × close icon on the uploaded file card to remove it, or drag and drop a new file onto the upload area to replace it immediately.