Image Resizer

No. Resizing runs in your browser with its built-in image engine; the files are never sent to Toolkitta. Keep the tab open until you download or send your results — reloading clears the batch. Website hosting and performance measurement are described in our Privacy notice.

In Pixels mode, fill in only the width or only the height and leave the other side on Auto: each image keeps its own proportions. Percent and Longest side always keep proportions. Presets fix both sides, so use Fit or Pad rather than Stretch if you do not want any distortion.

They only matter when both width and height are set. Fit keeps the whole picture inside the size, so one side can come out shorter. Fill makes exactly that size and crops the overflow from the edges, centred. Pad makes exactly that size and fills the leftover margins with a background colour (or leaves them transparent in PNG and WebP). Stretch forces the exact size and changes the proportions.

Enlargement is off by default. If the size you asked for is larger than the image, it is kept at its original pixels (or, for Fill and Stretch, the requested shape is shrunk until it fits), and the file details say so. Tick Allow enlargement when a destination insists on a minimum size and a slightly soft result is acceptable.

In: JPG, PNG, WebP, HEIC/HEIF (iPhone photos), AVIF, GIF, BMP, SVG, ICO and TIFF, up to 20 files, 20 MB each and 100 MB per batch, at most 40 megapixels. Out: the original format where the browser can write it (JPG, PNG, WebP), otherwise PNG for pictures with transparency and JPG for the rest — or add Format to choose JPG, PNG, WebP or AVIF.

Fewer pixels often produce a smaller file, but the byte saving is not proportional and re-encoding can sometimes make a small original larger. If you need a kilobyte limit, add Compress and choose Target size; for a different format, add Format. Both run in the same pass, so each image is encoded only once.

Re-encoded results usually omit camera and GPS tags, but an unchanged result or lossless PNG optimisation can keep metadata. Resizing is not a metadata-removal guarantee. Use Remove Image Metadata and inspect the downloaded copy when removal is the goal. Keep your original if you need its tags.

DPI is only a label for print; screens show pixels. For a print, multiply the size in inches by 300 to get pixels — a 4 × 6 inch print wants about 1,200 × 1,800 pixels — and resize to that. The resizer does not change the DPI tag itself.

In Interactive Editor, select the photo to crop, rotate or flip it while keeping its layers editable. Batch Resize can add Rotate/Flip in the same pass. For exact crop ratios or circles, send the result to Image Cropper; it also offers Batch and Interactive Editor modes.