Image Converter
Convert one or multiple JPG, PNG, and WEBP images directly in your browser. Files are processed locally without being uploaded to a server.
Drag and drop JPG, PNG, and WEBP images here, or choose files
Supported source formats: JPG, PNG, and WEBP
Conversion Settings
Lower values may reduce file size, but can also reduce image quality.
Download converted files separately through your browser.
Original Files (0)
Converted Results (0)
About this image converter
This tool converts images between JPG, PNG, and WEBP formats directly in your browser. It is useful when you need a more compatible format, smaller file size, or support for transparency depending on your use case.
JPG is commonly used for photos and smaller file sizes, PNG is often used for graphics and transparent backgrounds, and WEBP is a modern format that can provide strong compression with good quality.
If you convert transparent PNG or WEBP images to JPG, transparent areas will be replaced with a white background because JPG does not support transparency.
FAQ
Can I convert multiple images at once?
Yes. You can upload multiple files and convert them together in one batch.
Which format should I choose for transparent images?
PNG and WEBP are usually better for transparent images. JPG does not support transparency.
Why does the converted file size sometimes get bigger?
File size depends on image content, dimensions, output format, and quality settings. In some cases, converting to a different format can increase size instead of reducing it.
How Image Format Conversion Works
The image converter uses the browser's built-in Canvas API together with the toBlob method to re-encode your image in a different format. When you drop a file onto the tool, the image is decoded into a raw bitmap and drawn onto an invisible HTML canvas element. The canvas then serializes that bitmap into the target format — JPEG, PNG, or WebP — by calling toBlob with the appropriate MIME type and quality parameter. This re-encoding step is what changes the container format; the pixel dimensions and visual content remain exactly the same unless you also resize.
Choosing the right output format matters more than it might seem. JPEG is a DCT-based lossy codec optimized for photographic gradients; it produces small files for photos but creates block artifacts on flat-color graphics. PNG uses lossless deflate compression and supports a full alpha channel, making it ideal for logos, UI screenshots, and anything that needs a transparent background. WebP is a modern codec from Google that combines lossy and lossless modes; it typically outperforms both JPEG and PNG in file size while matching their perceived quality. All encoding happens in the JavaScript main thread, so no server is ever involved.
When to Use the Image Converter
- 1Converting PNG screenshots to JPEG before uploading to a content management system — screenshots rarely need transparency, and JPEG can be 5–10× smaller.
- 2Changing JPEG photos to PNG when you need to overlay them on a transparent background in a design tool or web page without color fringing.
- 3Converting any format to WebP for web assets — Google PageSpeed Insights and Core Web Vitals reward WebP usage, and all major browsers have supported it since 2023.
- 4Transforming WebP images back to JPEG or PNG for compatibility with older software, upload forms that reject WebP, or document editors that do not support modern image codecs.
Format Choice & Quality Guide
JPEG: Best for photographs, scans, and any image with continuous color gradients. Use quality 80–90 for web use; the visual difference from quality 100 is minimal while file size drops dramatically. Avoid JPEG for images with hard edges, text, or transparency.
PNG: Best for screenshots, UI graphics, logos, and images requiring a transparent background. PNG is lossless so there is no quality slider — the output is pixel-perfect. PNG files are larger than JPEG for photographs but smaller for flat-color graphics.
WebP: The best default for web publishing. Use lossy WebP (quality 75–85) to beat JPEG file sizes, or lossless WebP when you need transparency with better compression than PNG. Check your target audience's browser statistics before committing to WebP-only delivery.
Avoid converting JPEG → PNG for photographs — you will get a much larger lossless file that contains all the original JPEG artifacts with no benefit.
Supported Formats & Browser Compatibility
- Supported input formats: JPEG (.jpg, .jpeg), PNG (.png), WebP (.webp), GIF (.gif), BMP (.bmp), TIFF (.tiff) — depending on browser decode support.
- Supported output formats: JPEG, PNG, WebP. Output to AVIF is not yet supported due to inconsistent browser encoder availability.
- Browser support: Chrome 90+, Edge 90+, Firefox 88+, Safari 15+. WebP encoding requires Chrome 23+, Edge 18+, Firefox 96+, Safari 14+. TIFF input depends on the browser's native image decoding.
- The tool processes files entirely in the browser; there are no file size restrictions beyond available device memory.
Tips for Best Results
Tip 1
Convert to WebP for any image destined for a web page — the size savings over JPEG are usually 25–35 % with equal perceived quality.
Tip 2
When converting JPEG to PNG, be aware that file size will increase significantly — the conversion is lossless from the JPEG decode onward, but the JPEG artifacts are now frozen into a larger lossless file.
Tip 3
For icons and logos, always use PNG or lossless WebP to preserve crisp edges. JPEG introduces block artifacts that are especially visible on icon-sized images.
Tip 4
If your target platform does not support WebP (some email clients, older CMS plugins), fall back to JPEG for photos and PNG for graphics.
Tip 5
Batch-convert multiple files in one session by selecting all files at once — each file is encoded independently.
Tip 6
For animated images, this tool handles only the first frame. Use a dedicated GIF or APNG tool for multi-frame animations.
Help
Frequently Asked Questions
Does conversion happen on the server?
No. The conversion uses the browser's Canvas API entirely inside your browser tab. Your files never leave your device.
Will converting JPEG to PNG improve the image quality?
No. Converting JPEG to PNG produces a lossless copy of the already-decoded JPEG, including all existing compression artifacts. Quality cannot be improved by changing the container format.
Which format should I use for web images?
WebP is the best default for web images in 2024 and beyond — it is supported by all major browsers and produces the smallest files. Use JPEG as a fallback for browsers that might not support WebP.
Can I convert a PNG with transparency to JPEG?
Yes, but the transparent areas will be filled with a solid color (white by default) because JPEG does not support transparency. If you need to preserve transparency, convert to WebP or keep it as PNG.
How do I convert multiple images at once?
Select multiple files in the file picker dialog. The tool encodes each image to the target format independently and lets you download them individually or as a ZIP.
Why is my WebP output larger than the original JPEG?
This can happen when the original JPEG was already highly optimized or when you use lossless WebP mode for a photograph. Try lossy WebP at quality 80 — it almost always beats JPEG in file size for photos.
Does the tool support HEIC or AVIF input?
HEIC input depends on the browser — Safari on Apple devices can decode HEIC natively, while Chrome cannot. AVIF input is supported in Chrome 85+ and Firefox 93+. AVIF output is not yet available due to inconsistent browser encoder support.
Is there a limit to how many files I can convert?
There is no hard limit set by the tool. Processing speed and memory usage depend on your device. Converting large batches of high-resolution images on a mobile device may be slow.