Image Format Converter

Convert images between PNG, JPG, and WebP formats instantly. Free, no upload, works offline.

100% Client-Side — Your data never leaves your browserFree — No signup required

Drop images here or click to upload

PNG, JPEG, WebP, BMP, GIF — up to 50MB per file — batch upload supported

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Integrate this tool into your workflow with our REST API. 3 free requests/day, unlimited with Pro.

What is Image Format Converter?

You have a PNG screenshot that needs to be a JPG for email. A WebP image from a website that your design tool cannot open. A JPEG photo you need as a transparent PNG. These format conversion needs come up constantly, and most online converters make you upload your images to their servers, wait for processing, deal with watermarks, and sit through ads. AllKit's Image Format Converter does it all instantly in your browser. No upload, no waiting, no nonsense.

The tool supports the three formats that matter for the modern web: JPEG (the universal photo format, smallest file size for photos), PNG (lossless quality with transparency support), and WebP (Google's modern format that combines the best of both). You can convert between any combination: PNG to JPG, JPG to PNG, WebP to PNG, WebP to JPG, PNG to WebP, JPG to WebP. Every conversion is instant because it uses your browser's built-in Canvas API.

For JPEG and WebP output, you get a quality slider that lets you find the perfect balance between file size and visual quality. Want a tiny file for a thumbnail? Slide it down to 60. Need maximum quality for a portfolio piece? Push it to 100. The tool shows you both the original and converted file sizes in real-time, with a percentage change indicator so you can see exactly how much space you are saving or gaining.

Batch conversion is supported — upload multiple images and convert them all to the same format at once. This is a huge time-saver when you need to convert an entire folder of screenshots from PNG to JPEG, or prepare a set of WebP images for a platform that does not support WebP yet. Each image shows its own before and after file size comparison.

Because everything runs locally in your browser using the Canvas API, your images never leave your device. There is no server upload, no cloud processing, no privacy risk. The tool works offline, handles images of any size, and processes conversions in milliseconds. It is the fastest, most private image converter you will find.

Why use AllKit?

No ads, no distractions — a clean interface that lets you focus on the task
Privacy-first — 100% client-side processing, nothing is uploaded
Free forever — core tools are free with no usage limits
API available — integrate into your workflow via our REST API

How to Use Image Format Converter

Click the upload area or drag and drop one or more images onto the tool. Supported input formats include PNG, JPEG, WebP, BMP, and GIF.
Select the target output format from the format buttons: PNG, JPEG, or WebP. The conversion applies to all uploaded images.
For JPEG or WebP output, adjust the quality slider to control the trade-off between file size and visual quality. Higher quality means larger files. The default values (85 for JPEG, 80 for WebP) work well for most use cases.
The tool converts your images instantly and shows the result with file size comparison. You can see the original format and size alongside the converted format and size.
Click the Download button to save the converted image to your device. For batch uploads, each image has its own download button.
To convert more images, simply upload additional files. You can change the target format at any time and all images will be re-converted automatically.
Compare the visual quality of the converted image with the original. If the quality is too low, increase the quality slider and the conversion updates instantly.

Common Use Cases

Converting Screenshots for Email and Documents

Screenshots saved as PNG files are often unnecessarily large. Convert them to JPEG to reduce file size by 70-90% before attaching to emails, inserting into Word documents, or uploading to project management tools.

Converting WebP Images for Compatibility

Many websites now serve images in WebP format, but not all software and platforms support it. Convert WebP to PNG or JPEG when you need to use downloaded images in Photoshop, PowerPoint, older browsers, or social media platforms that reject WebP uploads.

Preparing Images for Web Publishing

Convert large PNG images to WebP or JPEG for faster website loading. WebP typically achieves 25-35% smaller file sizes than JPEG at equivalent quality, improving Core Web Vitals and SEO performance.

Creating Transparent PNG from Other Formats

When you need transparency support (logos, icons, overlays), convert to PNG. While JPEG does not support transparency, converting from a format that preserves alpha channels to PNG maintains the transparency data.

Batch Converting Product Photos

E-commerce sellers often receive product images in mixed formats from different suppliers. Batch convert them all to a consistent format (JPEG for photos, PNG for graphics with text) to maintain a uniform catalog.

Reducing Image File Size for Storage

Large PNG screenshots and BMP images can be converted to JPEG or WebP to dramatically reduce storage requirements. A 5MB PNG screenshot might become a 200KB JPEG with no visible quality loss.

Format Requirements for Platforms

Some platforms have strict format requirements. LinkedIn prefers JPG or PNG. Some print services require specific formats. Quick conversion ensures your images meet the requirements without installing software.

Technical Details

Image conversion uses the browser's native Canvas API. The uploaded image is drawn onto an HTML5 canvas element, then exported in the target format using canvas.toBlob() with the appropriate MIME type (image/png, image/jpeg, image/webp). This leverages the browser's built-in image codecs, which are implemented in C++ and extremely fast.

JPEG encoding uses lossy compression controlled by the quality parameter (0.0 to 1.0). At quality 0.85, JPEG files are typically 70-90% smaller than the equivalent PNG with minimal visible quality loss. JPEG does not support transparency — any transparent pixels are composited against a white background.

WebP encoding also uses lossy compression (when quality < 1.0) but achieves 25-35% smaller files than JPEG at equivalent visual quality. WebP supports transparency (alpha channel) even in lossy mode, making it the most versatile modern format. Browser support for WebP is now universal across Chrome, Firefox, Safari, and Edge.

PNG encoding is always lossless — the output is pixel-identical to the canvas content. PNG files are larger than JPEG or WebP for photographic content but smaller for images with large flat-color areas (screenshots, diagrams, logos). PNG supports full alpha transparency with 256 levels of opacity per pixel.

All processing happens in the browser's rendering engine. No image data is sent to any server. The tool works offline after the page loads and can handle images of any resolution, though very large images (over 50 megapixels) may cause temporary browser slowdowns due to canvas memory usage.

Frequently Asked Questions

What image formats can I convert between?▾

You can upload PNG, JPEG, WebP, BMP, and GIF images and convert them to PNG, JPEG, or WebP. All six conversion directions between the three main output formats are supported (PNG→JPG, PNG→WebP, JPG→PNG, JPG→WebP, WebP→PNG, WebP→JPG).

Does converting to JPEG reduce quality?▾

JPEG uses lossy compression, so there is always some quality loss compared to the original. At the default quality setting (85), the difference is virtually invisible for photographs. Lower quality settings produce smaller files with more visible compression artifacts. For pixel-perfect quality, use PNG instead.

Is WebP better than JPEG?▾

For most use cases, yes. WebP achieves 25-35% smaller file sizes than JPEG at equivalent visual quality, and it supports transparency (which JPEG does not). The only downside is that some older software and platforms do not support WebP, but all modern browsers do.

What happens to transparency when converting to JPEG?▾

JPEG does not support transparency. When converting a PNG or WebP with transparent areas to JPEG, the transparent pixels are composited against a white background. If you need to preserve transparency, convert to PNG or WebP instead.

Can I convert multiple images at once?▾

Yes. Upload multiple images and they will all be converted to the selected format. Each image shows its own file size comparison and has its own download button.

Are my images uploaded to a server?▾

No. All conversion happens entirely in your browser using the Canvas API. Your images never leave your device, are never uploaded, and are never stored. The tool works even when you are offline.

Why is my converted file larger than the original?▾

This can happen when converting from a compressed format (JPEG, WebP) to a lossless format (PNG). PNG preserves every pixel exactly, so photographic images produce large PNG files. It can also happen when converting a heavily compressed JPEG to a high-quality WebP.

What is the best format for photos?▾

For web use, WebP offers the best quality-to-size ratio. For universal compatibility, JPEG is the safest choice. For archival or editing purposes where quality must be preserved exactly, use PNG. For photos that need transparency, use WebP or PNG.

What is the best quality setting?▾

For JPEG, 85 is the sweet spot for most photos — good quality with significant file size reduction. For WebP, 80 achieves similar visual quality. Below 70, compression artifacts become noticeable. Above 95, file sizes increase dramatically with minimal visible improvement.

Can I convert GIF animations?▾

The tool converts single-frame images. If you upload an animated GIF, only the first frame will be converted. For animated GIF conversion, you would need a specialized GIF processing tool.