How Image Compressor Works
The image is redrawn onto a canvas and re-encoded at your chosen quality level using lossy JPEG or WebP compression. Lowering the quality slider discards more visual detail in exchange for a smaller file — the preview updates so you can judge the trade-off before downloading.
How to Use This Tool
- Choose or drag in an image.
- Pick an output format — JPEG or WebP.
- Drag the quality slider to balance file size against visual quality.
- Select Compress, check the size comparison, then Download.
Example
A 4 MB PNG photo re-encoded as JPEG at 80% quality typically drops to a few hundred kilobytes, with very little visible difference for photographs.
Helpful Tips
- PNG source images with transparency will lose transparency if compressed to JPEG — use WebP if you need to keep an alpha channel.
- For photos, quality settings between 70–85% usually give the best size-to-quality balance; graphics with sharp edges or text compress less predictably.
Frequently Asked Questions
Is my image uploaded anywhere?
No, compression happens entirely in your browser using the Canvas API.
Why is WebP sometimes not available?
WebP encoding via the Canvas API is supported in most modern browsers (Chrome, Edge, Firefox), but older or less common browsers may fall back to a different format — you'll see a clear error if that happens.
Does compressing an image reduce its dimensions?
No, only file size and quality are affected — width and height stay the same. Use the Image Resizer if you also want to change dimensions.
This tool runs entirely in your browser. Your input is not uploaded to any server.