Image Tools
Convert between formats, resize (by size, percentage, or social presets), or compress images.
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Maximum file size: 20MB
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How to Compress an Image
- Select the image you want to compress.
- Set the quality; 80 is a good starting point and rarely shows visible loss.
- Set a maximum width if the image is larger than you need.
- Compress and download the result.
- Compare it against the original before discarding anything.
Quality and Dimensions Both Matter
Two things drive an image's file size: how many pixels it contains and how heavily those pixels are compressed. Lowering quality alone will only take you so far, because a 4,000-pixel-wide photo still has four thousand pixels of data to store.
Reducing the dimensions is usually the bigger win. A photo displayed at 800 pixels wide on a page gains nothing from being 4,000 pixels wide, and scaling it down first often cuts the file size by an order of magnitude before compression is even applied.
Choosing a Quality Level
- 90 to 100 is near-original quality with modest savings.
- 75 to 85 is the practical range for web use, where loss is hard to spot.
- 50 to 70 saves considerably more and suits thumbnails or background images.
- Below 50 shows visible blocking and colour banding on most photographs.
Common Use Cases
- Meeting an upload size limit on a form or portal.
- Making page images smaller so a site loads faster.
- Reducing a photo before emailing or messaging it.
- Preparing a batch of images to a consistent maximum width.
Limitations
- One image at a time; there is no batch mode.
- The output is always JPEG, so a transparent PNG will lose its transparency and gain a solid background.
- JPEG compression is lossy and cannot be undone, so keep your original.
- Repeatedly compressing an already-compressed image degrades it further each time.
Privacy and Processing
The compression is performed by your own browser using a canvas, which means your image never leaves your device and is not uploaded to us or anyone else.
Image Compressor FAQ
What quality setting should I use?
Around 75 to 85 is the practical range for web use, where loss is hard to spot. Use 90 or above for near-original quality, and 50 to 70 for thumbnails. Below 50 you will see visible blocking on most photographs.
Why does reducing the width help so much?
File size depends on both pixel count and compression. A photo displayed at 800 pixels wide gains nothing from being 4,000 pixels wide, so scaling it down first often cuts the size dramatically before compression is even applied.
Can I compress several images at once?
No. This tool handles one image at a time; there is no batch mode.
What happens to a transparent PNG?
The output is always JPEG, which has no transparency, so transparent areas become a solid background. If you need to keep transparency, use the image resizer and choose PNG or WebP output.
Can I undo the compression?
No. JPEG compression is lossy and cannot be reversed, so keep your original file. Compressing an already-compressed image repeatedly degrades it further each time.
Is my image uploaded?
No. The compression is performed by your own browser using a canvas, so the image never leaves your device.
Related Developer Tools
Keep moving through common developer workflows with Image Resizer, PDF to Image, Compress PDF. You can also browse the full Developer Tools collection or return to the all tools hub.