Convert images between JPG, PNG and WebP right in your browser — no upload, no signup, no watermark. Adjust quality, keep transparency where it matters, and download a single file or your whole batch at once. Because everything runs locally, your images never leave your device and there are no limits on how much you convert.
PNG and WebP preserve transparency. Converting to JPEG flattens any transparent areas onto a white background, because JPEG has no alpha channel.
Why
Every image format is a set of trade-offs, and choosing the right one is one of the simplest ways to make a website faster or a file easier to share. JPEG is the workhorse of photography: it uses lossy compression that discards detail the human eye barely notices, producing small files for complex, colorful photos — but it has no transparency and degrades a little every time it is re-saved. PNG is lossless and supports a full alpha channel, which makes it ideal for logos, screenshots, icons and any graphic with sharp edges or transparent backgrounds, at the cost of much larger files for photographic content. Knowing when to reach for each is the difference between a crisp 40 KB logo and a bloated 2 MB one, and converting between them on demand removes the guesswork.
WebP and AVIF are the modern answer to that old JPEG-versus-PNG dilemma. WebP, developed by Google, supports both lossy and lossless modes plus transparency in a single format, and typically produces files 25–35% smaller than an equivalent JPEG or PNG at the same visual quality. AVIF, built on the AV1 video codec, compresses even more aggressively and is excellent for photographs, though encoding it inside a browser is not yet universally supported. For the modern web, converting older JPGs and PNGs to WebP is one of the highest-impact, lowest-effort performance wins available: smaller images mean faster page loads, better Core Web Vitals scores, lower bandwidth bills and a smoother experience for visitors on slow mobile networks.
The choice between lossy and lossless is the single most important decision when converting. Lossless formats such as PNG store every pixel exactly as it was, so the image survives unlimited re-saves without ever degrading — perfect for text, line art, UI mockups and anything you will edit again later. Lossy formats such as JPEG and WebP analyze the image and intelligently drop information that is hard to perceive, which is why they can shrink a busy photograph to a fraction of its original weight. The catch is that lossy compression is generational: each time you re-encode an already-lossy file you lose a little more detail, so it is best to convert from the highest-quality original you have rather than from a file that has already been compressed several times.
Transparency, or the alpha channel, is the other concept that trips people up, and it dictates which formats you can safely use. PNG and WebP can store partially or fully transparent pixels, which is what lets a logo float cleanly over any background or a product cutout sit on a colored banner without an ugly rectangle behind it. JPEG, by contrast, has no alpha channel at all — it physically cannot represent transparency. When you convert a transparent PNG or WebP straight to JPEG, those see-through pixels have to become something, and a naive converter often renders them black. This tool instead fills transparent regions with a clean white background so a flattened logo or icon still looks right, but if you truly need to preserve transparency you should keep the file as PNG or WebP.
Compatibility is the practical reason format conversion never goes away, because not every program speaks every format. WebP and AVIF are now supported by all modern browsers, but plenty of older desktop applications, email clients, print services, marketplaces and content management systems still expect a plain JPG or PNG. A colleague might send you a WebP that will not open in a legacy photo editor, or a job-application portal might reject anything that is not a JPEG. Converting in the other direction — from a cutting-edge format back to a universal one — is just as common as converting forward, and having both directions available means you are never blocked by a tool that has not caught up to the modern web.
This converter runs entirely in your browser using the HTML Canvas API, which means your images are decoded, redrawn and re-encoded locally and never uploaded to a server. That is a meaningful privacy guarantee — a screenshot of a contract, a product mockup under NDA, or a personal photo never leaves your device. It also makes the tool fast and unlimited: there is no upload queue to wait in, no file-count cap, no account and no watermark. You control the trade-off directly with a quality slider for lossy formats, you can convert an entire folder of images in a single batch, and you can see the before-and-after file size for every file so you know exactly what you are gaining before you ever click download.
How
Drag and drop one file or a whole folder onto the dropzone, or click to browse your device. JPG, PNG, WebP, GIF and BMP are all accepted as sources. Everything is read and processed locally in your browser, so nothing is uploaded anywhere.
Choose PNG, JPEG or WebP as your target format. For the lossy formats, drag the quality slider to balance file size against sharpness, and the whole batch re-converts automatically so you can preview the result. PNG is lossless, so the slider hides and full quality plus transparency are preserved.
Each result shows its original format and size next to the new one, with a slider to compare them side by side. Download a single image, or grab the entire batch at once with the Download all button. No watermark is ever added, and there are no limits.
Who
Convert heavy JPGs and PNGs to WebP to slash page weight, improve Core Web Vitals and keep transparent UI assets crisp — without installing a build pipeline, plugin or command-line tool just to re-encode a handful of files.
Turn raw camera photos and screenshots into lightweight, fast-loading images for posts and galleries, so readers on phones are not waiting on multi-megabyte downloads that drive up bounce rates.
Standardize product shots and ad creatives into one consistent format, shrink them for faster store and landing pages, and flatten transparent mockups onto a clean white background when a marketplace or ad platform only accepts JPEG.
Compress an oversized PNG so it fits under an email attachment limit, or convert a WebP into a JPG that a course portal, application form or older document editor will actually accept.
Export web-friendly WebP or quality-tuned JPEG copies of high-resolution shots for portfolios and social media, while keeping the original masters untouched and private on the local machine.
Anyone handling sensitive screenshots, contracts, IDs or personal photos can convert formats without trusting a remote service, because the files are processed in the browser and never transmitted to a server.
When
Convert JPG and PNG assets to WebP to cut file size by a third or more, improving load time, bandwidth usage and the search-friendly performance metrics that influence rankings and ad costs.
Move a flattened JPEG logo or icon into PNG or WebP when you need a transparent background for overlays, banners, watermarks or a design with no visible box behind it.
Some platforms only accept JPG or PNG. Convert a WebP, AVIF or HEIC-derived file into the exact format a web form, marketplace, government portal or print service demands before you submit.
Re-encode an oversized PNG photo as a quality-tuned JPEG or WebP so it slips under an email attachment limit, uploads instantly over a slow connection or fits within a messaging app size cap.
When you need to preserve an edited graphic exactly, convert to lossless PNG so the pixels survive future re-saves intact, rather than letting repeated JPEG compression slowly erode the detail.
When a colleague sends a WebP that an older photo editor cannot open, convert it to a universally supported JPG or PNG so you can view and edit it in whatever software you already have.
Convert images between JPG, PNG and WebP right in your browser — no upload, no signup, no watermark. Adjust quality, keep transparency where it matters, and download a single file or your whole batch at once. Because everything runs locally, your images never leave your device and there are no limits on how much you convert.
Use the Image Converter