Free Image Converter
Convert between JPG, PNG, WebP, AVIF, HEIC, TIFF, GIF, BMP & ICO — free, instant, in-browser
Conversion Settings
Output Format
Recommended
Legacy
Upload Images to Convert
Drag & drop or click to browse • HEIC, TIFF, AVIF & more supported
Free Online Image Converter — Convert JPG, PNG, WebP, GIF & BMP Instantly
Image format incompatibility is one of the most persistent and frustrating digital bottlenecks. You try to upload a profile picture, but the website only accepts PNG. You attempt to email a design mockup, but the TIFF file is 50MB and gets rejected by the mail server. You download a graphic from a modern website and receive a WebP file that your older photo editing software absolutely refuses to open.
The OmniWebKit Image Converter is engineered to eliminate these friction points entirely. This free, browser-based tool allows you to seamlessly convert between all major image formats (JPEG, PNG, WebP, GIF, and BMP) with zero quality loss and zero server uploads. Whether you are a web developer optimizing assets for Core Web Vitals, a photographer prepping images for client delivery, or just someone trying to upload a photo to a strict government portal, this tool provides an instant solution.
Unlike traditional online converters that upload your private photos to remote servers (raising significant privacy and security concerns), our converter utilizes advanced HTML5 Canvas APIs to process every pixel directly within your browser. The files never leave your device. This architecture not only guarantees absolute privacy but also makes the conversion process dramatically faster, as you aren't bottlenecked by your internet upload speed.
How to Convert Images Online
Upload Your Files
Drag and drop your images directly into the upload zone, or click the "Browse Files" button. You can upload JPG, PNG, WebP, GIF, BMP, TIFF, and ICO files simultaneously. There is no strict file size limit—it depends entirely on your device's RAM.
Select the Target Format
Choose the output format you need: JPEG (best for photos), PNG (best for logos and transparency), WebP (best for modern web delivery), GIF (best for basic graphics), or BMP (best for legacy Windows systems).
Adjust Compression Quality (Optional)
If you select JPEG or WebP, a quality slider will appear. The default is 90% (which offers an excellent balance of high visual fidelity and low file size). Lowering this slider will compress the file further, reducing its size but potentially introducing visual artifacts.
Review File Size Changes
The converter works instantly in the background. Look at the file list to see a real-time comparison of your original file size versus the newly converted file size. A green badge indicates how much space you saved!
Download Converted Images
Click the download icon next to an individual file to save it, or click the "Download All" button at the top to save every converted image to your device in one swift action.
Key Features & Technical Advantages
100% Client-Side Processing
Privacy is paramount. When you upload a personal photo or a confidential corporate document, it stays on your computer. We use browser-native APIs to read the image data, translate it to the new format, and prompt the download locally.
Massive Batch Conversions
Need to convert an entire folder of 50 high-res camera photos to WebP for a website? No problem. Drag them all in. The tool processes them concurrently using your browser's background threading capabilities.
Intelligent Quality Control
Not all compression is created equal. Our WebP and JPEG encoders allow you to precisely dial in the quality-to-size ratio. See exactly how many kilobytes you save before committing to the download.
Preserves Image Dimensions
This tool performs a pure format conversion. The pixel dimensions (width and height) of your original image are preserved with 100% accuracy, ensuring your layout or design doesn't break after conversion.
Transparency Handling
When converting from a format that supports transparency (like PNG or WebP) to one that does not (like JPEG), our algorithm gracefully flattens the image against a pure white background, preventing ugly black artifacting.
Format Un-sticking
If you've downloaded an image that claims to be a JPG but fails to open in Photoshop, it might be a mislabeled WebP. Passing it through our converter strips out corrupted headers and generates a clean, standards-compliant file.
The Ultimate Image Format Guide
JPEG (JPG) — The Photography Standard+
JPEG is the undisputed king of web photography. It utilizes lossy compression, permanently discarding mathematical frequency data to achieve stunningly small file sizes. A 10MB raw camera file can easily become a 500KB JPEG. However, because it discards data, high-contrast edges (like text) will show "ringing" or artifacts. It also strictly lacks support for an alpha channel (transparency).
✓ Best for
Photographs, social media uploads, email attachments, massive gradients.
✗ Avoid when
Logos, UI icons, screenshots with text, anything requiring a transparent background.
PNG — The Lossless Champion+
PNG (Portable Network Graphics) uses a lossless compression algorithm. If you save an image as a PNG and reopen it, every single pixel is mathematically identical to the original. It fully supports 8-bit alpha transparency, making it the industry standard for overlay graphics. The trade-off is file size: photographic PNGs are often 5x to 10x larger than their JPEG counterparts.
✓ Best for
Logos, icons, UI elements, digital art, screenshots, graphics needing transparency.
✗ Avoid when
High-resolution photographs, as the file sizes will be massive and severely impact load times.
WebP — The Modern Web Format+
Developed by Google, WebP was explicitly engineered to replace both JPEG and PNG on the web. It is a dual-threat format, supporting both lossy and lossless compression, as well as full alpha transparency. On average, WebP produces files 25–35% smaller than JPEG at equivalent visual quality. Adopting WebP is one of the easiest ways to improve your Google Lighthouse and Core Web Vitals scores.
✓ Best for
Website hero images, e-commerce product photos, modern blog posts, web banners.
✗ Avoid when
Email marketing (many email clients don't support it), legacy software workflows.
GIF — The Animation Pioneer+
The Graphics Interchange Format is an ancient format (introduced in 1987) that survives almost entirely because of its animation capabilities. It is severely limited by a maximum palette of 256 colors per frame. If you try to save a photograph as a GIF, the colors will be dithered and banded, resulting in a heavily pixelated, retro appearance.
✓ Best for
Simple looping animations, low-color UI elements, memes.
✗ Avoid when
Photographs, anything requiring smooth gradients, high-quality prints.
BMP — The Uncompressed Behemoth+
Bitmap (BMP) stores pixel data exactly as it is, with absolutely zero compression. While this means the image is pristine, the file sizes are catastrophic. A standard 1080p image saved as a BMP will consume nearly 6 Megabytes. It should only be used when interacting with software that predates modern compression standards.
✓ Best for
Legacy Windows software compatibility, highly specific industrial or print workflows.
✗ Avoid when
Literally anywhere on the internet.
How Conversion Affects File Size & Quality
File size is often the primary motivation for format conversion, especially for web developers. However, understanding the relationship between compression and quality is crucial. Here is exactly what happens when you jump between major formats:
| Conversion Path | Expected Size Impact | Visual Quality Impact |
|---|---|---|
| PNG to JPEG | Shrinks by 60–80% | Minor loss (due to lossy encoding) |
| PNG to WebP | Shrinks by 20–40% | Zero loss (WebP supports lossless mode) |
| JPEG to PNG | Explodes to 3–8× larger | No additional loss (but previous JPEG artifacts remain) |
| JPEG to WebP | Shrinks by 25–35% | Minimal loss (re-encoding artifacts possible) |
| JPEG to GIF | Similar or larger | Severe color reduction (banded gradients) |
| Any format to BMP | Explodes to 5–15× larger | Zero loss (completely uncompressed pixels) |