Whether you are trying to shrink a screenshot, make a website load faster, or share an iPhone photo that someone else can actually open, you will eventually need to convert an image from one format to another. Format conversion is one of the most common image tasks, yet many people still resort to clunky desktop software or dubious download-required tools to do it.
The good news is that converting between PNG, JPG, WebP, and HEIC can be done entirely in your browser — no uploads to a server, no software to install, and no watermarks. This guide walks you through exactly how to do it for single images and in bulk, with tips on quality settings to get the best results.
Quick Format Reference
Before converting, it helps to know which format you actually need. Here is a brief summary:
- JPG (JPEG): Best for photographs and complex images where small file size matters. Uses lossy compression. Does not support transparency.
- PNG: Best for screenshots, graphics with text, logos, and any image that needs transparency. Lossless compression means larger files but zero quality loss.
- WebP: Best for web delivery. Supports both lossy and lossless compression plus transparency, and produces files 25 to 35 percent smaller than JPG at equivalent quality.
- HEIC: Apple's default photo format on iPhones. Excellent compression but poor compatibility outside the Apple ecosystem.
For a deeper comparison of the trade-offs between each format, read our full guide: JPG vs PNG vs WebP: Which Image Format Should You Use?
How to Convert a Single Image
The fastest way to change one image from one format to another is with our Image Format Converter. Everything happens in your browser — your image is never uploaded to any server.
- Open the tool: Go to the Image Format Converter page.
- Add your image: Drag and drop your file onto the upload area, or click to browse your device. The tool accepts JPG, PNG, WebP, HEIC, BMP, GIF, and TIFF files.
- Select the output format: Choose your desired target format from the dropdown (JPG, PNG, or WebP).
- Adjust quality (optional): For JPG and WebP, use the quality slider to balance file size against visual quality. 80 percent is a good default for most uses.
- Download: Click the convert button and your converted file downloads instantly.
The entire process takes just a few seconds, and because the conversion runs locally in your browser, even large files process quickly without any upload wait time.
How to Batch Convert Multiple Images
If you have a folder full of screenshots in PNG that you need as JPGs, or a set of WebP images from a website that you need in a more universal format, converting them one at a time is tedious. Our Bulk Image Converter handles this efficiently.
- Open the bulk tool: Navigate to the Bulk Image Converter.
- Add your images: Drag and drop multiple files at once, or select them from your file browser. You can add dozens of images in a single batch.
- Choose the target format: Select the format you want all images converted to.
- Set quality preferences: Adjust the quality slider to apply the same setting across all images in the batch.
- Convert and download: The tool processes all images and packages them into a single ZIP file for easy download.
Like the single image tool, batch conversion runs entirely in your browser. No images are uploaded, and there is no limit on the number of files you can process.
Common Conversion Scenarios
PNG to JPG: Reducing Screenshot File Sizes
Screenshots are saved as PNG by default on most operating systems, and for good reason — PNG preserves the sharp text and UI elements perfectly. However, PNG screenshots are often 2 to 5 MB each, which adds up quickly when you are attaching them to emails, uploading to project management tools, or including them in documents. Converting to JPG at 85 to 90 percent quality typically reduces file size by 70 to 80 percent with minimal visible difference, especially for screenshots of web pages or applications.
JPG to PNG: When You Need Transparency
JPG does not support transparency, so if you need to place an image on a non-white background or overlay it on another image, you need PNG. Converting from JPG to PNG alone will not add transparency — the image will have a solid background. To actually remove the background, use a tool like our background remover first, then save the result as PNG to preserve the transparent areas.
WebP to JPG or PNG: Software Compatibility
WebP is excellent for the web, but many desktop applications, older image editors, and some social media platforms still do not accept WebP files. If you download an image from a website and it is in WebP format, converting it to JPG (for photos) or PNG (for graphics with transparency) ensures you can use it everywhere. This is especially common when saving images from modern websites that have adopted WebP for performance.
JPG to WebP: Website Performance Optimization
If you are building or maintaining a website, converting your JPG images to WebP is one of the easiest performance wins available. WebP files are typically 25 to 35 percent smaller than equivalent JPGs, which translates directly to faster page load times and lower bandwidth usage. Google PageSpeed Insights specifically recommends serving images in WebP format. Use our Image Format Converter to convert individual hero images, or the Bulk Image Converter to process an entire site's image library at once.
HEIC to JPG: Sharing iPhone Photos
Since iOS 11, iPhones save photos in HEIC format by default. HEIC offers better compression than JPG, but Windows computers, Android devices, and many web services do not support it natively. If you have transferred photos from an iPhone and the recipient cannot open them, converting HEIC to JPG solves the problem instantly. The quality difference is negligible for sharing purposes, and JPG is universally supported on every device and platform.
Quality Settings When Converting
When converting to JPG or WebP (both lossy formats), the quality slider determines how much compression is applied. Understanding quality settings helps you find the right balance between visual fidelity and file size.
- 90 to 100 percent: Near-lossless quality. File sizes are larger, but virtually indistinguishable from the original. Use this for professional photography, print preparation, or archival copies.
- 75 to 89 percent: The sweet spot for most uses. At 80 percent, files are significantly smaller than the original with quality loss that is extremely difficult to detect in normal viewing. Ideal for web images, email attachments, and social media.
- 50 to 74 percent: Noticeable quality reduction, especially around fine details and text. Useful when file size is the primary concern, such as thumbnails or preview images.
- Below 50 percent: Significant artifacts become visible. Only use this for very small thumbnails or when extreme compression is necessary.
When converting to PNG, there is no quality slider because PNG uses lossless compression — the output is always pixel-perfect. However, PNG files will be larger as a result. If you need both small files and high quality, consider converting to WebP with lossless mode enabled.
Transparency handling: If you convert a PNG with transparency to JPG, the transparent areas will become white (or black, depending on the tool). To preserve transparency, convert to WebP or keep the image as PNG. If your primary goal is reducing file size while keeping transparency, our Image Compressor can reduce PNG file sizes without converting formats.
File Size Comparison by Format
To illustrate the differences between formats, here are typical file sizes for the same 1920 x 1080 photograph saved in each format:
| Format | Typical Size | Compression | Transparency |
|---|---|---|---|
| PNG (lossless) | 3.5 – 6 MB | Lossless | Yes |
| JPG (quality 85) | 300 – 600 KB | Lossy | No |
| WebP (quality 80) | 200 – 400 KB | Lossy | Yes |
| WebP (lossless) | 1.5 – 3 MB | Lossless | Yes |
| HEIC (default) | 250 – 500 KB | Lossy | No |
These numbers illustrate why format choice matters so much. A single photograph as PNG can be 10 times larger than the same image as WebP, with no perceptible quality difference at normal viewing sizes. For a website with 20 images, that difference translates to megabytes of extra data and noticeably slower page loads.
Frequently Asked Questions
Does converting an image reduce its quality?
It depends on the target format. Converting to PNG is always lossless — no quality is lost. Converting to JPG or WebP (lossy mode) does reduce quality slightly, but at 80 percent or above, the difference is imperceptible to most viewers. Converting from a lossy format to another lossy format (for example, JPG to WebP) does introduce a small additional quality loss, but it is minimal at reasonable quality settings.
Can I convert images without uploading them to a server?
Yes. Our Image Format Converter and Bulk Image Converter both run entirely in your browser using client-side JavaScript. Your images never leave your device, which is better for both privacy and speed.
What happens to transparency when I convert PNG to JPG?
JPG does not support transparency, so any transparent areas in your PNG will be filled with a solid color (typically white). If you need to keep transparency while reducing file size, convert to WebP instead, which supports transparency and offers better compression than PNG.
Is there a limit on how many images I can batch convert?
There is no artificial limit. Since the conversion happens in your browser, the only constraint is your device's available memory. Most modern computers and phones can handle batches of 50 to 100 images without any issues. For very large batches, processing may take a minute or two but will complete without problems.
Conclusion
Converting between image formats does not need to be complicated. Whether you are turning PNG screenshots into smaller JPGs for email, converting WebP images for compatibility with older software, optimizing your website's images by switching to WebP, or sharing iPhone HEIC photos with non-Apple users, the process takes just a few clicks with the right tools.
For single images, use our Image Format Converter. For multiple files, the Bulk Image Converter saves significant time. Both tools run in your browser with no uploads, no installs, and no watermarks. And if you want to understand the deeper trade-offs between formats before deciding which to convert to, check out our complete format comparison guide.