Upload an image and adjust the quality slider. Compression happens instantly as you change settings. 100% preserves the original file size, while lower percentages reduce file size immediately.
Need a smaller image file? This free image size reducer shrinks your photos in seconds. Upload an image, drag the quality slider, and watch the new file size update instantly. When it looks right, download a lightweight WebP or JPG that’s ready to email, upload to a form, or publish on your website.
How to Reduce Image Size Online
Reducing an image’s file size takes three quick steps, and there’s nothing to install.
- Upload your image. Click “Select Image to Reduce” and choose a photo from your device. The tool shows the original file size and resolution right away.
- Adjust the compression quality. Move the Compression Quality slider. Lower percentages create smaller files, and higher percentages keep more detail. The default of 70% is a good starting point for most photos, and the reduced file size updates instantly as you move the slider.
- Choose a format and download. Pick WebP for the smallest possible file or JPG/JPEG for maximum compatibility. Check the preview, then click “Download Image.”
Why Use This Image Size Reducer?
- Instant results. There’s no separate compress button to wait for. The file size updates in real time as you change the settings.
- See what you save. Compare the original and reduced file size and resolution before you download.
- You control the quality. A simple slider lets you balance a smaller file against a sharper image.
- Two useful formats. Export WebP for the best compression, or JPG/JPEG when you need a file that works everywhere.
- Preview before you save. See how your image looks after compression, so there are no surprises.
- Free to use. PixelConverter’s tools are free for everyone.
Image File Size vs. Image Dimensions: What’s the Difference?
These two terms are easy to mix up, and they solve different problems.
- File size is how much storage an image takes up, measured in kilobytes (KB) or megabytes (MB). Reducing it helps with upload limits, email attachments, and page speed. That’s what this tool does.
- Dimensions (resolution) are an image’s width and height in pixels, such as 1920 × 1080. Changing them changes how large the image appears on screen.
If you need an exact width and height, use our Image Resizer in Pixels. For websites, the best workflow is to resize the image to the size it will actually be displayed, then run it through the image size reducer.
What Is the Best Quality Setting?
There’s no single perfect number, because every image compresses differently. Use these ranges as a starting point, and always check the preview before you download.
| Quality setting | Best for | What to expect |
| 90–100% | Print, portfolios, detailed photography | Nearly identical to the original, with the smallest savings |
| 70–89% | Websites, blogs, email, social media | A strong balance of quality and file size for most photos |
| 40–69% | Thumbnails, strict upload limits, quick sharing | Much smaller files, but fine detail may start to soften |
| Below 40% | Cases where size matters more than looks | Very small files with visible quality loss |
WebP or JPG: Which Output Format Should You Choose?
This image size reducer exports two formats:
- WebP is a modern format built for the web. At comparable visual quality, WebP files are often around 25–35% smaller than JPG, and all major modern browsers support it. Choose WebP when you want the smallest file, especially for websites.
- JPG / JPEG is the most widely supported image format there is. Choose JPG when a form, app, marketplace, or older program requires it.
Not sure? Start with WebP. If the site or app you’re uploading to rejects it, switch the output format to JPG and download again.
When Should You Reduce Image Size?
Smaller images help in more situations than most people expect.
- Upload limits. Job applications, school and government portals, online marketplaces, and support tickets often cap attachments at a few hundred KB or a few MB.
- Faster websites. Large images are one of the most common reasons web pages load slowly. Smaller files load faster, which gives visitors a better experience and can help your search performance.
- Email and messaging. Lighter attachments send faster and are less likely to hit mailbox size limits.
- Social media and blogs. Smaller images load quickly, even on slow mobile connections.
- Storage. Free up space on your phone, computer, or cloud drive without deleting your photos.
Tips to Reduce Image Size Without Losing Visible Quality
- Start with the original file. Compressing an image that has already been compressed can add visible artifacts, so work from the highest-quality copy you have.
- Resize first if the image is much larger than you need. A 6000-pixel-wide photo that will be displayed at 800 pixels wide wastes data. Resize it with our pixel tool, then compress it.
- Compare before and after. Check the preview, and look closely at faces, text, and fine edges.
- Go easier on screenshots and graphics. Sharp lines and text show compression artifacts sooner than photos do, so use a higher quality setting.
- Keep a backup. Save the original in case you need a different size later.
Frequently Asked Questions About Reducing Image Size
How do I reduce the size of an image online?
Upload your image, move the Compression Quality slider until the reduced file size fits your needs, choose WebP or JPG, and click “Download Image.” The whole process takes only a few seconds.
Does reducing image size reduce quality?
Usually a little, yes. Compression works by discarding some image detail, so smaller files hold less data. At moderate settings, roughly 70–89%, the difference is hard to see on most photos. The lower you go, the more visible the loss becomes, which is why the live preview is useful.
How do I reduce an image to a specific size, like 100 KB or 200 KB?
Upload your image and lower the Compression Quality slider until the Reduced File Size shown on screen drops below your target. If the file is still too large at a low quality setting, resize the image to smaller dimensions first with the Image Resizer in Pixels, then compress it again.
What is the best quality setting for reducing image size?
For most photos, 70–89% gives a good balance between small file size and clear detail. Use 90% or higher when quality matters most, and go lower only when you have a strict size limit.
Should I choose WebP or JPG?
Choose WebP for the smallest files and for websites. Choose JPG when you need the widest compatibility with apps, forms, and older software.
What’s the difference between reducing and resizing an image?
Reducing an image makes the file lighter, meaning fewer KB or MB, by compressing it. Resizing changes the width and height in pixels. They work well together: resize to the dimensions you need, then reduce the file size.
Is this image size reducer free?
Yes, this image size reducer is free to use. No account or sign-up needed
Are my images private and safe?
Yes. The compression runs in your web browser, so your image stays on your device and isn’t uploaded to our servers.
More Free Image Tools
- Image Resizer in Pixels: change an image to an exact width and height in pixels.
- PixelConverter home page: browse all of our free pixel converters and image tools.