UtilibyWritten by the Utiliby editorial team · Last updated October 13, 2026 · Rules and formulas reviewed October 2026
What this free image converter does
Images come in many formats, and the one you have is rarely the one you need. A website asks for JPG, a download arrives as WebP, a design tool exports AVIF, an old program wants BMP, and your site needs an ICO favicon. An image converter turns one format into another without a trip to a desktop editor.
This free online tool converts between JPG, PNG, WebP, AVIF, BMP and ICO right in your browser. It handles many files at once, lets you set quality and the background color for transparent areas, makes multi-size favicons and returns a ZIP. Nothing is uploaded, there is no watermark and no sign-up.
How to convert an image in four steps
- Add your images. Drag in WebP, PNG, JPG, GIF, BMP, AVIF or SVG files, or click the drop area to choose them.
- Choose the output format. Press one of the To buttons, or use the Convert to list.
- Adjust the options. Set quality for JPG and WebP, a background color for transparent parts, or icon sizes for ICO.
- Download. Save one file, or all of them as a ZIP.
Image formats compared
| Format | Type | Transparency | Best for |
|---|---|---|---|
| JPG | Lossy | No | Photos, email, any device |
| PNG | Lossless | Yes | Screenshots, logos, graphics |
| WebP | Lossy or lossless | Yes | Websites, smaller files |
| AVIF | Lossy or lossless | Yes | Websites, smallest photo files |
| BMP | Uncompressed | No (here) | Old software, simple tools |
| ICO | Icon container | Yes | Favicons, Windows icons |
AVIF is usually the smallest for photos, WebP is close behind, and both are smaller than JPG at similar quality. JPG remains the most compatible choice, and PNG remains the most dependable for graphics with sharp edges.
Popular conversions and what to expect
- WebP to JPG or PNG: websites often serve WebP, and many programs and upload forms still want JPG or PNG. Choose JPG for photos and PNG if you need transparency.
- PNG to JPG: usually shrinks photos a lot. Screenshots and logos with flat color can get larger or show fringes, so keep them as PNG.
- JPG to PNG: useful for editing and for programs that need PNG, but the file becomes bigger and does not regain lost detail.
- JPG or PNG to WebP or AVIF: the usual way to speed up a website.
- AVIF to JPG: for sharing with people whose software cannot open AVIF.
- GIF or BMP to PNG or JPG: modernize old images; only the first frame of a GIF is used.
- SVG to PNG: turn a vector logo into a picture for a place that does not accept SVG.
Making a favicon (ICO) file
A favicon is the small icon shown in browser tabs and bookmarks. The classic format is a .ico file that can hold several sizes at once, so the browser can pick the best one. Start with a square image of at least 256 by 256 pixels, choose To ICO, and tick the sizes you want. 16, 32 and 48 pixels cover most needs. The tool places a non-square image in the center of a transparent square so the icon is not stretched.
Modern sites also use PNG icons of 192 and 512 pixels for phones and installable web apps. You can make those with the To PNG option and a Max width.
Quality, transparency and file size
For JPG, WebP and AVIF the Quality slider balances file size against detail. 85 to 90 is a safe default, and below 70 changes become visible. Transparent areas cannot exist in JPG or BMP, so those formats fill them with the background color you choose. If the destination has a dark page, choose a dark background rather than white to avoid a pale halo around the edges.
PNG has two modes here: Lossless keeps every color, and Smaller reduces the image to 256 colors with smooth dithering, which suits graphics and many screenshots.
Common uses
- Websites: convert JPG and PNG to WebP or AVIF for faster pages.
- Uploads and forms: meet a required format such as JPG or PNG.
- Email and documents: use a format every program can open.
- Design work: change an export to the format a tool needs.
- Developers: make favicons and app icons.
- Old files: bring BMP and GIF images into modern formats.
Troubleshooting
- A file will not open: your browser may not support its format. HEIC photos open only in Safari, so use Safari or convert them on the phone first.
- AVIF is missing: your browser cannot save AVIF. Try a recent Chrome, or use WebP.
- The background is white and I wanted transparent: save as PNG or WebP instead of JPG.
- The file got bigger: a lossless target such as PNG makes photos larger. Choose JPG or WebP.
- The GIF does not move: only the first frame is converted.
Online converter or desktop tools?
Command-line tools such as ImageMagick or libvips handle thousands of files and many obscure formats, and desktop editors give you control over every encoder setting. For everyday use, a browser converter is quicker and needs no install. It works well for the common web formats and keeps the files on your own device.
Online converter or desktop software?
Desktop programs and command-line tools can convert almost any format and run scripts over thousands of files. They also need to be installed and learned. A browser converter is the quick answer for everyday jobs such as turning a WebP download into a JPG, a PNG into a smaller JPG, or a logo into an ICO favicon. Open the page, drop the files and save the results.
Many online converters upload your files to a server, which is slow for large pictures and a privacy risk for personal photos and documents. This one converts inside your browser using the same image engine that shows pictures on web pages. Nothing is sent anywhere, and speed depends only on your device.
The trade-off is that your browser decides what it can open and save. Formats such as HEIC, RAW camera files, TIFF and PSD are not supported in most browsers, and saving AVIF is not available everywhere. For those, a desktop program is the better choice.
Privacy and how it works
Your browser opens each image with its own decoder and draws it onto a canvas. For JPG, WebP and AVIF the browser's encoder writes the file. For PNG, BMP and ICO, the page writes the file bytes itself. Nothing is uploaded, stored or logged, and the converted files contain no EXIF data.
Frequently asked questions
How do I convert an image online for free?
Drop your images into the tool, choose the format you want with the buttons or the Convert to list, and the converted files appear. Press Download on one, or Download converted images for a ZIP. Everything runs in your browser.
How do I convert WebP to JPG?
Drop the WebP file, press To JPG and download. The tool opens WebP in your browser and saves a JPG. Transparent areas are filled with the background color you choose, white by default.
How do I convert PNG to JPG?
Drop the PNG, press To JPG, adjust the quality if you like, and download. JPG files of photos are usually much smaller than PNG files. If the PNG has transparency, the transparent parts become the background color.
How do I convert JPG to PNG?
Drop the JPG and press To PNG. The result is lossless from that point on, but a JPG-to-PNG file is usually larger and does not regain detail that JPG compression already removed.
Are my images uploaded to a server?
No. The images are opened and converted on your own device using your browser. Nothing is sent to Utiliby or any other server.
Which formats can I open?
JPG, PNG, WebP, GIF, BMP, AVIF, SVG and ICO, as long as your browser can display them. HEIC photos open only in Safari. Format support follows your browser, so an unusual file may fail.
Which formats can I save?
JPG, PNG, WebP, BMP and ICO in every browser. AVIF is offered only in browsers that can save it, such as recent versions of Chrome.
Which format is best: JPG, PNG or WebP?
JPG is best for photos and works everywhere. PNG is best for screenshots, logos and anything that needs transparency or perfect edges. WebP is usually smaller than both and works in all current browsers, so it is a good choice for websites.
Can I convert many images at once?
Yes. Drop as many images as you like. They are converted one after another with the same settings, and you can download them as a ZIP.
How do I make a favicon or ICO file?
Choose To ICO, tick the icon sizes you need, such as 16, 32 and 48 pixels, and download the .ico file. Start with a square image of at least 256 pixels for a sharp result. Non-square images are centered on a transparent square.
Does converting reduce the quality?
Saving as JPG, WebP or AVIF applies lossy compression, so a little detail is lost. Set the quality at 90 or higher to keep it hard to see. PNG and BMP are lossless, so converting to them adds no further loss.
What happens to the transparent background?
PNG, WebP and AVIF keep transparency. JPG and BMP cannot, so transparent areas are filled with the background color you choose.
Can I convert an animated GIF?
The tool converts only the first frame, so the result is a still image. It does not make or keep animations.
Can I convert SVG to PNG?
Yes. Drop the SVG and press To PNG. The image is drawn at the size your browser reads from the file, and you can set a Max width to control the pixel size.
Can I convert an image to BMP?
Yes. Press To BMP. BMP files are uncompressed and large, but some older programs and devices still ask for them.
Is there a size limit?
No fixed limit, but very large images need a lot of memory, and phones may fail above about 16 megapixels. If a file fails, set a Max width to make it smaller.
What can I print or save from the page?
Print / save summary gives a table of the files, the formats they were converted from and to, and the sizes before and after. Copy summary copies the same table as text. The converted images are the main download.
Sources and further reading
- MDN Web Docs, Image file type and format guide, for the differences between JPEG, PNG, WebP, AVIF, GIF and BMP.
- web.dev (Google), Use WebP images and AVIF, for guidance on modern image formats.
- W3C, PNG Specification, for how lossless PNG files are written.
- Microsoft, ICO file format documentation, for how icon files hold several sizes.
- WHATWG HTML Standard, canvas toBlob, for how browsers save canvas images in supported formats.
Sources were consulted in October 2026. Standards and rules can change, so always check the official page for your situation.