🗜️ Image Compressor
Compress images online free with a live quality slider. Cut file size up to 90% without visible loss. No upload, no watermark.
🗜️ Image Compressor
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About the Image Compressor Tool
Image weight is the single largest contributor to slow page loads on most websites. It is also the most common reason an upload gets rejected by a form with a 200 KB or 1 MB cap. Compression solves both, and for photographic content the savings are dramatic — a 4 MB photo often drops below 400 KB with no difference the eye can detect at normal viewing size.
The quality slider gives you direct control over that trade-off, with a live file-size readout so you can find the exact point where the image still looks right. Compression runs on your own device through the Canvas API, meaning your photos are never uploaded, there is no daily limit, and results appear instantly.
How to Use Image Compressor
- Select the image you want to compress.
- Drag the quality slider and watch the projected file size update. 70–85% is the sweet spot for most photographs.
- Compare the preview against the original to confirm you are happy with the result.
- Download the compressed image.
When to Use This Tool
- Getting a photo under a strict upload limit on an exam, visa, or job application form
- Speeding up a website by reducing the weight of hero and gallery images
- Fitting more photos into limited cloud or device storage
- Sending images over email or messaging without hitting attachment caps
- Preparing lightweight images for an email newsletter
Things Worth Knowing
- Compression is lossy and permanent. Always keep your original file.
- Screenshots and graphics with text compress poorly — text edges are where JPEG artefacts show first. Keep quality high for those.
- Compressing an already-compressed image gives diminishing returns and stacks artefacts.
Quick Facts
| Tool name | Image Compressor |
| Category | Image Tools |
| Price | Free — no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None — your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
How much can I compress before it looks bad?
For photographs, 70–80% quality is usually indistinguishable from the original at normal viewing size. Below 50% you will start seeing blockiness in smooth areas like skies and skin. Use the live preview to judge your specific image.
Can I compress to an exact size like 100 KB?
Adjust the slider while watching the size readout and stop when you hit your target. If quality drops unacceptably before you get there, resize the dimensions down first, then compress.
Does compression change my image dimensions?
No. Pixel dimensions stay the same; only the encoding quality changes. To change dimensions, use the Image Resizer.
Is compression reversible?
No. Discarded data cannot be recovered. This is why keeping the original file matters.