Convertix | Fast Online Image Converter – Convert Images Free in Browser
Image Converter
Convert images between PNG, JPG, WebP and PDF — instantly, in your browser.
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PNG, JPG, JPEG or WebP
PNG vs JPG: what's the real difference?
PNG and JPG are the two most common image formats on the web, but they were built to solve different problems, and choosing the wrong one can quietly hurt your site's load times or your image's visual quality.
How compression works in each format
JPG (or JPEG) uses lossy compression, which means it permanently discards some image data to shrink the file size. Every time you save a JPG, the encoder analyzes blocks of pixels and simplifies color transitions that the human eye is less likely to notice. This makes JPG files small and fast to load, but repeated saving and editing can introduce visible artifacts, especially blocky distortion around sharp edges or text.
PNG, on the other hand, uses lossless compression. No image data is thrown away, so a PNG always looks identical to the original, no matter how many times you open and resave it. The tradeoff is file size: because nothing is discarded, PNG files are typically much larger than JPGs of the same dimensions, particularly for photographs.
When to use JPG
JPG is the better choice for photographs, complex images with lots of color gradients, and any situation where file size matters more than pixel-perfect accuracy. Product photos, blog header images, and social media uploads are all good candidates for JPG, since the format's compression is specifically tuned for photographic content and the quality loss is usually invisible at normal viewing sizes.
When to use PNG
PNG shines with graphics that have flat colors, sharp edges, or text, such as logos, icons, screenshots, and illustrations. It also supports a full alpha transparency channel, which JPG does not, making it the only practical choice when you need a see-through background. If you're designing a logo for a website header or exporting UI mockups, PNG will preserve crisp lines that JPG would blur or smudge.
File size considerations
A common mistake is using PNG for everything because it "looks better." For photographic content, a well-compressed JPG at 80 to 90 percent quality is often visually indistinguishable from a PNG, while being a fraction of the size. Since page speed directly affects search rankings and user experience, mismatched format choices can be a hidden source of slow-loading pages.
Quick summary
- Choose JPG for photos, large hero images, and anywhere small file size is the priority.
- Choose PNG for logos, icons, screenshots, and any image that needs transparency.
- Remember that PNG never loses quality on resave, while JPG degrades slightly each time it's re-encoded.
If you have images in the wrong format, you don't need design software to fix it. Use the converter tool above to switch between PNG and JPG directly in your browser, with no uploads and no waiting.
What is WebP, and why are more sites switching to it?
WebP is a modern image format developed by Google, designed specifically to solve the tradeoffs that have long existed between PNG and JPG. If you've noticed sites loading faster than they used to, there's a good chance WebP is part of the reason.
A format built for the modern web
Traditional formats like JPG and PNG were designed decades ago, before today's expectations around page speed and mobile bandwidth. WebP was created to deliver smaller file sizes without the usual sacrifices, supporting both lossy and lossless compression in a single format, along with transparency and even animation, similar to a GIF but far more efficient.
How WebP compares to JPG
In lossy mode, WebP images are typically 25 to 35 percent smaller than a comparable JPG at the same visual quality. This is because WebP's encoder uses more advanced prediction techniques borrowed from video compression, allowing it to represent complex photographic detail with fewer bytes. For a site with hundreds of product images, that size reduction can meaningfully cut bandwidth costs and improve load times.
How WebP compares to PNG
In lossless mode, WebP also outperforms PNG, generally producing files 20 to 30 percent smaller while preserving full image quality and alpha transparency. This makes WebP a genuine all-in-one replacement: a single format that can losslessly replace PNG for graphics and icons, or losslessly compress photos with quality on par with JPG, all while keeping files smaller.
Browser support and practical use
WebP is now supported by every major modern browser, including Chrome, Firefox, Safari, and Edge, which has removed the compatibility concerns that once held the format back. Many content management systems and e-commerce platforms now serve WebP automatically. For SEO purposes, smaller image files contribute directly to faster page load speed, a known ranking factor, as well as improved Core Web Vitals scores like Largest Contentful Paint.
Is there a downside?
The main consideration is workflow compatibility. Some older design tools, email clients, or content systems may not handle WebP smoothly, so it's worth keeping a JPG or PNG fallback for those edge cases. WebP files also can't always be opened directly by basic image viewers on older operating systems without an update or plugin.
Quick summary
- WebP combines the strengths of JPG and PNG into a single, more efficient format.
- It typically produces smaller files than both, with comparable or better visual quality.
- Supports transparency and animation, and is supported by all major browsers today.
Ready to try it? Use the converter above to turn your existing PNG or JPG images into WebP in seconds, directly in your browser.
How to convert images between PNG, JPG, and WebP
Converting an image from one format to another sounds technical, but in practice it's a quick, simple task, especially with browser-based tools that don't require installing software or uploading files to a server.
Why you might need to convert an image
There are several common reasons to convert image formats. A photographer might need a JPG instead of a large PNG to keep a portfolio site fast. A web developer might want to convert legacy JPG and PNG assets to WebP to shave seconds off page load times. A designer might need a PNG with transparency for a logo that was originally exported as a flat JPG. In each case, the underlying skill is the same: re-encoding pixel data into a new file format while controlling for quality and size.
Step 1: Choose the right source image
Start with the highest-quality version of your image available. If you only have a heavily compressed JPG, converting it to PNG won't restore lost detail, since PNG can only preserve the data that already exists in the file, not recover what was discarded during JPG compression. Whenever possible, convert from an original or lightly compressed file rather than a copy that has already been through multiple lossy saves.
Step 2: Pick the right target format
Decide what the image is for. Photographs intended for fast loading are usually best converted to JPG or WebP. Graphics, icons, and anything needing transparency should go to PNG or WebP, since both support an alpha channel while JPG does not. If file size and modern browser support aren't a concern, JPG and PNG remain perfectly safe, widely compatible choices.
Step 3: Adjust quality settings
For lossy formats like JPG and WebP, a quality slider controls the balance between file size and visual fidelity. A setting around 80 to 90 percent is usually the sweet spot: low enough to meaningfully shrink the file, high enough that compression artifacts aren't noticeable. It's worth comparing a few quality levels side by side, since the ideal setting can vary depending on the image's content and how much fine detail it contains.
Step 4: Convert and download
Once the format and quality are set, the conversion itself takes a fraction of a second. Using the tool above, your browser reads the image, redraws it onto a canvas, and re-encodes it into the new format, all without sending the file anywhere. The result is a converted file you can download immediately, with the original always left untouched on your device.
A few practical tips
- Keep a copy of the original file before converting, in case you need to start over with different settings.
- When converting to JPG, remember that transparency will be lost and replaced with a solid background.
- For batches of images, converting to WebP usually offers the best balance of quality and file size for modern websites.
The converter above supports PNG, JPG, and WebP in both directions, so you can move between formats freely depending on what each image needs. Drop a file in, choose a format, and download the result, no installs and no file uploads required.