How to Use This Tool
Drop an image into the upload zone — JPG, PNG, WebP, GIF, BMP, or ICO files are all accepted — and the tool immediately reads its dimensions, format, and file size directly in your browser using the FileReader and Canvas APIs, without transmitting a single byte to a server.
Pick your target format from the Convert to dropdown. Converting to JPG or WebP reveals a quality slider so you can balance visual fidelity against file size, which is the fastest way to shrink a bloated PNG screenshot or a heavy DSLR photo before shipping it to production. Converting to PNG keeps every pixel lossless, which matters for logos, UI mockups, and anything with transparency. Selecting ICO swaps the dimension fields for a preset icon-size list, since favicons and app icons need to be perfect squares — the source image is automatically centered and scaled to fit without distortion.
Need an exact resolution instead? Edit the Width and Height fields directly. Leave Lock aspect ratio checked to keep proportions intact automatically, or uncheck it if you need a specific non-proportional crop for a banner or thumbnail slot. Hit Convert Image and the tool renders the result onto an off-screen canvas, encodes it in the target format, and gives you a live preview plus a one-click download — no watermarks, no queue, no account.
JPG vs. PNG vs. WebP vs. ICO: Choosing the Right Format
Every image format is really just a different trade-off between file size, quality, and compatibility, and picking the wrong one is one of the most common (and easiest to fix) causes of slow page-load scores. JPEG uses lossy compression tuned for photographs — it throws away detail the human eye barely notices in exchange for dramatically smaller files, but it has no alpha channel, so converting a PNG with transparency to JPG will flatten transparent areas onto a solid background. PNG is lossless and supports full alpha transparency, which makes it the right call for logos, icons, and screenshots with text, at the cost of larger files for photographic content. WebP was built by Google specifically to beat both: it supports transparency like PNG while achieving compression closer to (or better than) JPEG, and virtually every modern browser decodes it natively today, which is why converting legacy JPG and PNG assets to WebP is one of the highest-leverage web performance wins available.
ICO is a different beast entirely — it's a container format, not a compression algorithm. A modern .ico file simply wraps one or more embedded PNG images behind a small binary directory, which is exactly how this tool builds a valid icon file client-side: it renders your image onto a square canvas, exports it as PNG, then wraps those bytes in a correctly-structured ICO header. Reading an existing ICO back out works the same way in reverse, parsing the icon directory to locate and decode the largest embedded image.
- Use JPG for photographs, hero banners, and anything without transparency where file size matters most.
- Use PNG for logos, diagrams, and any asset that needs a transparent background or pixel-perfect edges.
- Use WebP as your default for web delivery — smaller than JPEG and PNG in most real-world cases with no visible quality loss.
- Use ICO exclusively for favicons and desktop/app icons, sized at 16, 32, 48, or 256px depending on where it will be displayed.
One caveat: animated GIFs can be uploaded and their first frame will be read and converted, but browsers do not expose an encoder for writing new animated GIFs through the Canvas API, so this tool focuses on static-image conversion across JPG, PNG, WebP, and ICO — the four formats that cover the vast majority of real-world web and app-icon workflows.