Image Converter: Change PNG, JPG and WebP in Your Browser

The Image Converter lets you change images between PNG, JPG and WebP entirely in your browser, so your files never leave your device. Drop in a screenshot, a photo, or a batch of graphics, pick a target format, and download the converted versions in seconds. There is nothing to install and nothing to upload.

If you have ever been blocked because a website only accepts JPGs, or you needed a transparent PNG turned into a smaller WebP, this free image converter solves it without sending your images to a stranger's server.

What is an image converter and why use one

An image converter changes a picture from one file format to another, for example from PNG to JPG or from JPG to WebP. The pixels stay the same, but the way they are encoded and stored changes, which affects file size, image quality, and where you can use the file.

Each format has a job:

• PNG uses lossless compression and supports transparency. It is ideal for logos, diagrams, screenshots, and anything with sharp edges or a see-through background.
• JPG (JPEG) uses lossy compression and produces small files for photographs. It does not support transparency, so transparent areas have to be filled with a solid color.
• WebP is a modern format that often beats both PNG and JPG on file size at similar quality. It supports transparency and works in every current browser.

You convert between them when a platform rejects your format, when you need a smaller file for uploading or emailing, or when you want transparency that JPG cannot provide. Doing it in the browser means no software, no sign-up, and no privacy trade-off.

How to convert an image between PNG, JPG and WebP

The tool is built to be fast and obvious. Here is the full workflow:

1. Open the converter. Go to schools.app/image-converter. It loads instantly and works on Windows, Mac, Linux, ChromeOS, and most phones and tablets.
2. Add your images. Drag and drop files onto the dropzone, or click to browse. You can add a single image or a whole batch at once. PNG, JPG, and WebP are all supported as inputs.
3. Choose the target format. Pick PNG, JPG, or WebP from the format menu. This is the format every selected image will be converted into.
4. Set the quality (for JPG and WebP). Because JPG and WebP are lossy, a quality slider appears so you can balance file size against sharpness. The default of 90% keeps images looking crisp; lower values shrink the file further. PNG is lossless, so the slider is hidden when you choose it.
5. Convert and download. Click the convert button. Each image is processed locally and downloaded with the new file extension, keeping its original name. A whole batch finishes in moments because there is no upload wait.

That is it. No account, no watermark, no email required.

Use cases for students

• Meet assignment upload rules. Course portals and exam systems are picky. If a dropbox only accepts JPG, convert your PNG screenshots before submitting.
• Shrink images for a slide deck or doc. Converting bulky PNG photos to JPG or WebP keeps your presentation or report from ballooning in size.
• Fix a profile or ID photo. Many student portals demand a specific format for headshots; convert in one click instead of hunting for software.
• Prepare graphics for a project site. Turn screenshots and diagrams into WebP so a class website or e-portfolio loads faster.
• Reuse a transparent logo. Need your club's transparent PNG on a white-background JPG flyer? The converter flattens it cleanly.

Use cases for teachers

• Standardize submissions. When students hand in a mix of formats, convert them all to one consistent type before grading or archiving.
• Build worksheets and handouts. Convert clip art and photos to the right format and size before dropping them into a document or printable.
• Optimize images for your LMS. Upload limits on Google Classroom, Moodle, or Canvas are easier to meet with compact WebP or JPG files.
• Keep student images private. Because nothing is uploaded, you can convert photos of student work or class activities without privacy worries.
• Prep newsletter and website art. Convert logos and event photos into the format your school's site or email template expects.

Features and benefits

• Three core formats, both directions. Convert freely among PNG, JPG, and WebP. Input one, output another, in any combination.
• Batch conversion. Add many images and convert them all to the same target format in a single click.
• Smart transparency handling. PNG and WebP preserve transparency. When you convert a transparent image to JPG, which has no alpha channel, the tool flattens it onto a clean white background instead of producing black or broken areas.
• Quality control for lossy formats. A quality slider for JPG and WebP lets you trade a little detail for a much smaller file when you need it.
• Original filenames kept. Each output reuses the source name with the new extension, so a batch stays organized.
• Zero install, zero cost. It runs in any modern browser with no downloads, no subscription, and no limits.

If your real goal is to make files smaller rather than change format, pair this with the Image Compressor. If you need to bundle several pictures into one document, the Image to PDF tool does that in the browser too.

Privacy: everything happens in your browser

This is the part that makes a browser-based converter genuinely different. Most online converters require you to upload your files to a remote server, run the conversion there, and download the result. That means your screenshots, photos, and documents sit on someone else's machine, and you have no real way to know how long they are stored or who can see them.

The schools.app Image Converter never does that. Your images are read and converted directly on your device using your browser's own canvas engine. Nothing is uploaded, nothing is logged, and no copy is kept anywhere. You can even disconnect from the internet after the page loads and it will still work, which is the simplest proof that your files are staying put.

For students handling ID photos and for teachers handling images of minors or student work, that local-only design is not a nice-to-have, it is the responsible default.

Tips and best practices

• Pick PNG when you need crisp edges or transparency. Logos, icons, diagrams, and screenshots with text stay sharp as PNG and keep see-through backgrounds.
• Pick JPG for photographs. Photos with smooth gradients compress well as JPG, giving you small files without obvious quality loss.
• Try WebP first for the web. WebP usually produces the smallest file at the same visual quality, which is ideal for websites and LMS uploads.
• Do not expect JPG to keep transparency. Converting a transparent PNG to JPG fills the background with white by design. If you need transparency, choose PNG or WebP instead.
• Mind one-way quality loss. Going PNG to JPG and back to PNG will not restore detail that the lossy JPG step discarded. Keep an original copy of important images.
• Convert format first, then compress if needed. If files are still too big, run the output through a dedicated compressor rather than dropping JPG quality to extremes here.

Frequently asked questions

Does the image converter upload my files anywhere?

No. Every conversion runs locally in your browser using the canvas API. Your images are never sent to a server, never stored, and never seen by anyone but you.

Can I convert a transparent PNG to JPG?

Yes, but JPG cannot store transparency. The tool flattens any transparent areas onto a white background so the result looks clean. If you need to keep transparency, convert to PNG or WebP instead.

Will converting reduce my image quality?

It depends on the format. PNG is lossless, so converting to PNG preserves every pixel. JPG and WebP are lossy, so some detail is discarded, but the quality slider lets you control how much. At 90% the difference is usually invisible.

Can I convert several images at once?

Yes. Add as many images as you like, choose one target format, and convert the whole batch in a single click. Each file downloads with its original name and the new extension.

Which image formats are supported?

You can convert between PNG, JPG (JPEG), and WebP in any direction. These cover the vast majority of everyday needs for school portals, documents, and the web.

Is the image converter really free?

Yes. There is no account, no subscription, no watermark on your images, and no usage limit. It is one of many free tools in the schools.app suite, alongside the Image Compressor.

Convert your images now

Whether you are clearing an upload error, prepping art for a slide deck, or standardizing a stack of student submissions, the Image Converter handles PNG, JPG, and WebP in seconds, with smart transparency handling and full privacy. No uploads, no install, no cost. Open the image converter and convert your first image right now.