Compress Image Online – Free Image Compressor
Reduce image file size for JPG, PNG, and WebP instantly. Batch compress multiple images — free, browser-based, no signup.
No signup · No limits · Works on any device
What Is an Online Image Compressor?
An online image compressor reduces the file size of image files — JPG, PNG, or WebP — using compression algorithms. Smaller images load faster on websites, consume less storage, are easier to attach to emails, and are quicker to upload to social media or cloud storage. Image compression is one of the most common digital tasks for photographers, web developers, content creators, and anyone who regularly works with photos. There are two types of image compression: lossy and lossless. Lossy compression (used for JPG and WebP) achieves smaller files by permanently discarding fine detail that the human eye is unlikely to notice. At moderate quality settings, the size reduction is dramatic — often 60–80% — with visually imperceptible quality loss. Lossless compression (used for PNG) achieves smaller files by encoding the pixel data more efficiently without discarding any information. FileQuick's image compressor uses lossy compression for JPG and WebP files (at 72% quality) and lossless re-encoding for PNG. For a typical JPEG photo, 72% quality reduces file size by 60–75% compared to an uncompressed source while maintaining excellent visual quality for web use, email attachments, and social media. PNG compression removes redundant data from the PNG's deflate stream without losing any pixel information. Batch compression is fully supported — you can drop in multiple images at once and each downloads compressed individually. Everything runs in your browser's Canvas API, so your photos never leave your device.
Why use FileQuick?
Most image hosting platforms, email services, and content management systems have file size limits or automatically re-compress large images — often at lower quality than you'd like. Compressing your images before uploading gives you control over the quality tradeoff. FileQuick's 72% JPEG setting is the sweet spot used by many professional web developers — aggressive enough to produce genuinely small files, conservative enough that quality loss is barely visible even on close inspection. And because it runs in your browser, your photos never get uploaded to a third-party compression service.
How to Compress Images Online — Step by Step
- Click 'Upload Files' or drag and drop your JPG, PNG, or WebP images into the drop zone.
- Review the file list — all selected images will be compressed in one batch.
- Click 'Compress Images'. Each image is processed sequentially using the Canvas API.
- Each compressed image downloads automatically with '_compressed' added to the filename.
- Compare the original and compressed file sizes — typical results are 50–80% smaller for JPG.
Frequently Asked Questions
Is the image compressor free?
Yes, completely free — no account, no payment, and no limits on files per session.
What formats does it support?
JPG/JPEG, PNG, and WebP are all supported. JPG and WebP are compressed at 72% quality (lossy). PNG is re-encoded losslessly.
How much will my images be compressed?
For JPG images, typically 50–80% size reduction at 72% quality. PNG results vary based on the original file's compression — PNG is re-encoded losslessly so the reduction is less dramatic than JPG.
Will compression affect visible quality?
For JPG and WebP, quality is slightly reduced to achieve smaller sizes — at 72% quality, this is usually imperceptible for web use and social media. PNG compression is lossless, so quality is identical to the original.
Are my files uploaded to a server?
No. All compression uses the browser's Canvas API. Your images never leave your device and are not stored anywhere.