Free image tools for faster pages and easier uploads
Oversized images are one of the most common reasons a page feels slow on mobile data. These three tools fix that without design software: convert to WebP, convert PNG to JPG, or resize and compress in one step. They suit store owners preparing product photos, marketers publishing blog images, and anyone facing a "JPG under 200 KB" upload limit. All three run in your browser, so your images are never uploaded to our servers.
Which tool should you use?
| Your situation | Use | What it changes |
|---|---|---|
| Image is the right size but the file is heavy, and it is going on your website | JPG/PNG to WebP Converter | Format and quality; dimensions unchanged; transparency kept |
| Image is much larger than it is displayed, such as a 4,000 px camera photo | Image Resizer and Compressor | Width, height, format (WebP or JPEG) and quality |
| A portal, marketplace or vendor needs JPG, or a PNG photo is huge | PNG to JPG Converter | Format and quality; you choose the colour that fills transparent areas |
If an image is both too big in dimensions and in the wrong format, use the resizer with WebP output, which does both in one pass.
Settings that work for most images
- Dimensions: about twice the width the image is displayed at, so it stays sharp on high-density phone screens.
- Quality: start at 82% for WebP and 90% for JPEG, then lower it until you can see a difference and step back up.
- Format: WebP for your own website. Google's WebP documentation reports 25–34% smaller files than comparable JPEGs. Use JPG where WebP is not accepted, and PNG for sharp screenshots and when you need the original transparent file.
- Always keep the original and re-export from it, never from an already compressed copy.
After exporting, give files descriptive names and add width, height and alt text when you publish. Our technical SEO audit checklist covers image weight alongside other page-speed checks, and website traffic but no leads looks at what slow pages cost in enquiries. For a site built fast from day one, see our website development service.
Frequently asked questions
Are my images uploaded anywhere?
No. All three tools read the file you choose, process it on an HTML canvas inside your browser and create the download on your device. Nothing is sent to GrowthSparx servers, which makes them suitable for unreleased product photos and personal documents. Very large images depend on your device's memory, so close other heavy tabs if a conversion stalls.
Which image format is best for websites?
WebP is usually the best default for photos and graphics on your own site: it is smaller than JPEG and PNG at similar quality, supports transparency and works in all current major browsers. Keep PNG for sharp screenshots where every pixel matters, and use JPG when a platform, portal or vendor does not accept WebP.
Should I resize or compress first?
Resize first. Cutting a 4,000 px photo to the 1,200 px it actually needs removes most of the data before compression even starts, and you can then use a higher quality setting without a large file. The Image Resizer and Compressor does both in one export, so set the dimensions, choose WebP or JPEG, then adjust quality.