Antiloom Format Converter
Convert between WEBP, JPG and PNG right in your browser — batch conversion, transparency matte control, quality tuning and one-click ZIP download. Nothing ever leaves your device.
Drop images here, or click to browse
WEBP, JPG, PNG, GIF or BMP · up to 30 images at once
Image Compressor Tool ( Batch/Single file Compress ) Antiloom Tool
Shrink file sizes with target-size mode, resize presets and a live before/after slider.
Convert WEBP, JPG and PNG Without Uploading Anything
Almost every image you save from the web today arrives as a WEBP file. It is an excellent format for websites, but it quietly causes problems the moment you try to use that image anywhere else. Older versions of Photoshop and Premiere Pro refuse it. Some mobile editing apps will not import it. Plenty of government portals, job applications and school submission forms accept only JPG or PNG. The Antiloom Format Converter fixes that in a few seconds, and it does the whole job inside your own browser so your files never touch a server.
What This Converter Actually Does
The tool reads each image you drop in, decodes it using your browser's built-in image engine, redraws it onto an HTML5 canvas, and re-encodes it in the format you picked. Because every one of those steps happens on your own device, there is no upload queue, no server processing time, and no copy of your photo sitting in someone else's storage. It also means the tool keeps working on a slow connection — once the page has loaded, the conversion itself needs no internet at all.
You can convert a single image or up to thirty at once. Each file gets its own card showing the original format and size next to the converted result, so you can see exactly what changed before you download anything.
Choosing the Right Output Format
| Format | Transparency | Best used for |
|---|---|---|
| JPG | No | Photos, thumbnails, form uploads, anything that must work everywhere |
| PNG | Yes | Logos, screenshots, overlays, cut-out subjects, pixel-perfect graphics |
| WEBP | Yes | Websites and blogs where smaller files mean faster page loads |
A useful rule of thumb: if the image has a transparent background you want to keep, convert to PNG or WEBP. If you need maximum compatibility and do not care about transparency, convert to JPG. If the file is going onto a website you control, WEBP will almost always give you the smallest file at the same visual quality.
The Transparency Matte — Why It Matters
This is the part most basic converters get wrong. JPG has no way to store transparency, so when a transparent PNG or WEBP is converted to JPG, something has to fill those empty pixels. Many tools silently fill them with white, which leaves ugly bright edges around a subject that was meant to sit on a dark background.
Antiloom lets you choose. Pick White for documents and light layouts, Black for dark-themed designs and video overlays, or Custom to match any exact brand or background colour with the colour picker. The matte control only appears when you are converting to JPG, because it is the only format where the choice actually changes anything.
Quality and Maximum Size
The quality slider controls how aggressively JPG and WEBP compress the image. Anywhere between 80% and 95% is usually indistinguishable from the original to the human eye while producing a dramatically smaller file. The slider is hidden automatically when you convert to PNG, since PNG is a lossless format and a quality value would do nothing.
The maximum size dropdown is optional and only ever scales images down, never up. It is handy when you have a batch of enormous camera photos headed for the web and you want them capped at 1920px without opening an editor. Leaving it on "Keep original dimensions" preserves the full resolution, aside from a safety cap at 4096px that exists to keep very large files from exhausting your device's memory.
How to Use the Antiloom Format Converter
- Drop one or more images into the upload area, or click it to browse your files.
- Choose your target format — JPG, PNG or WEBP.
- If you picked JPG and your images have transparency, choose a matte colour.
- Adjust the quality slider, and optionally cap the maximum dimension.
- Click Convert All Images. You can cancel mid-run if you change your mind.
- Download each file from its card, or grab the whole batch with Download All as ZIP.
When Is Converting the Right Move?
- A WEBP file won't open or import. Converting to JPG or PNG solves almost every compatibility complaint from older software and mobile apps.
- An upload form only accepts JPG or PNG. Very common on job portals, exam applications and government websites.
- You need a transparent background preserved. Converting a PNG to JPG destroys it; converting to WEBP keeps it while shrinking the file.
- You're publishing to a website or blog. Converting your images to WEBP is one of the easiest page-speed wins available.
- You want a screenshot that stays crisp. PNG keeps text and UI edges perfectly sharp, where JPG introduces fuzzy artefacts around them.
Privacy and What Happens to Your Metadata
Because conversion runs entirely in your browser, no image data is transmitted anywhere. As a side effect of redrawing images through canvas, embedded EXIF data — including camera details and GPS coordinates — is normally stripped from the converted file, which is useful if you plan to share the image publicly. Exact behaviour around colour profiles and orientation flags can vary a little between browsers, so treat metadata removal as a helpful side effect rather than a guaranteed privacy-scrubbing feature.
Frequently Asked Questions
Are my images uploaded to a server?
No. Every step runs in your browser using JavaScript and the Canvas API. Your files never leave your device, and nothing is stored anywhere after you close the page.
Will converting reduce my image quality?
Converting to PNG is lossless, so no visual data is discarded. Converting to JPG or WEBP re-encodes the image at the quality level you choose — at 85% or above, the difference is generally invisible. Keep in mind that converting an already-compressed JPG to another JPG re-encodes it a second time, so avoid repeating that unnecessarily.
Why did my file get bigger after converting?
That usually means you converted a compressed format into a lossless one — a JPG or WEBP turned into a PNG will almost always grow, sometimes considerably, because PNG stores every pixel exactly. Each card shows whether the result got smaller or larger so there are no surprises.
Can I convert animated GIFs or animated WEBP files?
Only the first frame is converted. Canvas-based processing cannot read or write multi-frame animation, so an animated source will produce a single still image. The tool flags this on the card whenever it happens.
The WEBP option is greyed out — why?
A small number of older browsers cannot encode WEBP even though they can display it. The tool tests your browser's actual encoding ability when the page loads and disables the option only if encoding genuinely is not available. Updating your browser, or switching to a recent version of Chrome, Edge, Firefox or Safari, will restore it.
How many images can I convert at once?
Up to 30 per batch. They are processed one after another rather than all at once, which keeps memory usage predictable even on phones and older laptops.
