Image Resizer & Converter
A complete image workbench: batch resize, convert between JPG, PNG and WebP, compress with a live quality preview, and apply transforms — all without uploading a single file.
How to use Image Resizer & Converter
- Drop in one or many images — JPG, PNG or WebP.
- Choose an output format and quality, or pick a size preset.
- Apply resizing, cropping and adjustments with a live preview.
- Export everything at once and download the batch.
About Image Resizer & Converter
Almost every image job that people open an editor for is really one of three things: fewer pixels, fewer bytes, or a different format. A full creative suite is enormous overkill for that, and most free web alternatives upload your photographs to a server in order to run the very canvas operations your own browser performs instantly. Image Studio decodes, transforms and re-encodes on your device, so a folder of forty photos processes as fast as your CPU allows with no upload wait, and holiday pictures, screenshots of private dashboards and scanned paperwork never leave the machine.
Resizing is offered three ways because the three have different failure modes. A percentage is the safe default when all you want is a smaller file. Explicit dimensions with the aspect ratio locked let you hit a maximum width without distorting anything. A preset — an Instagram square, a 1280×720 thumbnail, a 1584×396 LinkedIn banner — targets a fixed frame, and there the fit mode decides everything: contain letterboxes the picture inside the frame, cover fills it and crops the overflow from the centre, and stretch distorts to fill. Nothing is ever enlarged past its natural size, because upscaling only invents detail.
Quality is a live slider with the resulting file size beside it, which is worth considerably more than any recommended percentage. Every picture has a point past which further compression buys almost nothing and starts costing visible blocking, and where that point sits depends on the image — flat graphics fall apart early, busy foliage hides a great deal. Format choice follows the same logic: JPEG for photographs, PNG when transparency or pixel-exact flat colour matters, and WebP as the general-purpose modern option, typically 25–35% smaller than JPEG at matched perceptual quality and supported by every current browser.
One conversion detail catches people out. PNG and WebP carry transparency; JPEG does not. Converting a transparent PNG to JPEG has to composite it against something, so there is an explicit background colour to choose rather than a silent fill with black. Beyond geometry and encoding sit the corrections that fix a whole batch in one pass: rotation in quarter turns, horizontal and vertical flips, and brightness, contrast and saturation applied per pixel with Rec.709 luma weighting, so pulling the saturation to zero yields a sensible grey rather than a muddy one.
Frequently asked questions
Are my photos uploaded anywhere?
No. Image Studio decodes and re-encodes every file with your browser’s own canvas engine, so the pixels never leave your device. There is no account, no queue and no server-side copy waiting to be deleted on someone else’s schedule.
Which formats can I convert between?
PNG, JPEG, WebP, GIF, BMP and AVIF can all be read, and anything can be written out as JPG, PNG or WebP, with independent quality control for the two lossy formats. Leaving the format on “original” keeps each file in the type it arrived as.
Can I process many images at once?
Yes — drop in a whole folder’s worth, set one recipe of size, format, quality and adjustments, and export the batch in a single click. Each file is still processed individually, so a mix of portrait and landscape sources is handled correctly.
Should I convert my images to WebP?
For anything going on a website, usually yes: at matched perceptual quality WebP typically lands 25–35% below JPEG, and every current browser supports it. For files you will email or hand to someone else, JPG and PNG remain the safer choices.
What happens to transparency when I convert a PNG to JPG?
It has to be filled, because JPEG has no alpha channel at all. Rather than defaulting silently, the transparent areas are composited onto a background colour you pick — white for documents and print, or a brand colour when the image sits on a coloured page.
Will resizing make my image blurry?
Reducing size will not; the picture is resampled down, which discards detail cleanly. Enlarging would, which is why images are never scaled beyond their natural dimensions — a 400-pixel photo cannot be turned into a sharp 4000-pixel one, whatever the tool.
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