Resize multiple images at once to the same dimensions or percentage with batch processing.
This tool resizes a whole batch of images in a single pass, applying one target - a percentage like 50%, or a fixed width and height in pixels - to every file at once. Mixed folders (phone photos, scans, exported art) come out at one size without opening each image in an editor. The common surprise: pixel dimensions and file size are different things. A 2000-pixel-wide PNG can weigh more than the 4000-pixel JPEG it came from, because the output format and its compression, not the pixel count, decide how many bytes the result occupies. The whole job runs in the browser, so the images never leave your machine.
A concrete input and expected output from the current implementation.
Input
A batch of two JPEGs - photo_a.jpg (4032 x 3024) and banner.jpg (1600 x 1200) - with the scale set to 50%.
Expected output
photo_a.jpg is saved at 2016 x 1512 and banner.jpg at 800 x 600.
A percentage scales both axes by the same factor, so each image keeps its 4:3 shape: 4032 x 0.5 = 2016 and 3024 x 0.5 = 1512; 1600 x 0.5 = 800 and 1200 x 0.5 = 600. Both results preserve the original aspect ratio.
The tool stores a single resize instruction and applies it to each selected image in turn. A percentage multiplies both axes of every image by the same factor, so each image keeps its own proportions even when the batch mixes portrait, landscape, and square files. A fixed pixel size gives every output file identical dimensions, which is only stretch-free for images that already matched the target ratio.
Each output is a freshly encoded image file. For a lossy format like JPEG or WebP, the saved quality setting determines how much detail survives; for lossless PNG, every pixel is stored exactly. Resizing down can therefore shrink file size a lot or hardly at all depending on format, and re-saving a JPEG costs a little quality too, because every encode is lossy.
Resizing changes pixel count; the output format decides byte size. Photos re-saved as lossless PNG are barely compressed at all, so a 2000-pixel PNG can be larger than a 4000-pixel JPEG. Choose JPEG or WebP with a normal quality setting if file size is the actual goal.
Yes, the tool will scale them up, but the result is only as sharp as the source pixels. Enlarging cannot create detail that was never captured, and it magnifies existing compression artifacts, so upscaled photos look soft or blocky. For print or large displays, re-shoot or re-render at the needed size instead.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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