Why you might need to convert image formats
Each image format serves a different purpose: JPG suits photographs, PNG suits transparency, and WebP offers a smaller file size with near-identical quality. If you have an image in a format your website or app doesn't support, you need to convert it quickly without complex editing software.
What actually sets JPG, PNG, and WebP apart
Each format stores image data differently. JPG uses lossy compression that shrinks file size significantly, which suits photographic images with lots of color gradients, but it doesn't support transparency. PNG uses lossless compression, preserving every bit of image data precisely and always supporting transparency, but its file size is larger than JPG for the same image. WebP is a newer format that combines the best of both: smaller than JPG at similar quality, with optional transparency support like PNG, which is why it's become the preferred choice for modern websites.
How to convert image format on Fastols
The tool converts your image instantly after uploading:
Open the Image Format Converter
Open the tool directly from the tools page.
Upload the image
Drag the image in or select it from your device.
Choose the new format
Select the format you want to convert to, such as JPG, PNG, or WebP.
Download the converted image
After processing, you can download the image in the new format instantly.
Practical tips before you start
Before converting your image, keep these points in mind:
- If the image has a transparent background you want to keep, choose a format that supports transparency like PNG or WebP instead of JPG, which doesn't.
- If your goal is faster site loading, WebP usually gives the smallest file size at acceptable quality compared to JPG and PNG.
- If the image will be used in professional graphic design or printing, keep a high-quality format like PNG or TIFF if available.
- Make sure the platform or website you'll upload to supports the format you've chosen before converting.
Use WebP if your goal is to reduce file size while keeping quality close to the original — great for improving your website's speed.
Common use cases
- Preparing images to upload to a website in a format suited for fast loading.
- Converting iPhone photos in HEIC format to formats compatible with most devices and websites.
- Preparing images for social media platforms with different requirements for each one.
- Converting an image from an old or unsupported format to a modern one before using it in a design project.
Why choose Fastols?
Supports the most common formats
JPG, PNG, WebP, and more, all in one place
No upload to a server
Conversion happens right inside your browser
Completely free
Unlimited use with no hidden fees
Preserves image quality
The highest possible quality for the chosen format
Frequently asked questions
Does converting affect image quality?
Converting between most formats preserves the original quality as much as possible, but some formats like JPG use lossy compression depending on the save settings.
Which formats does the tool support?
You can convert between JPG, PNG, WebP, and other common formats easily.
Is my data stored with you?
No, we don't keep any copy of your data, and nothing is stored permanently.
Can I convert an image to WebP for use on my website?
Yes, WebP is one of the best choices for websites since it gives a smaller file size at quality close to JPG or PNG.
Does converting between formats change the image dimensions?
No, conversion only changes how the file is stored — the image's width and height stay the same.
Can I convert multiple images at once?
Yes, you can upload a batch of images and convert them all to the same format in a single process.
Ready to convert your image?
Try the Image Format Converter for free right now — no sign-up, nothing to install.
Try the Image Converter now