Swiss Army Toolkit

Set a maximum width or height and keep the proportions, one image or a whole batch.

Drag a rectangle over the picture and keep what is inside it.

Turn a photo in quarter steps and save it that way, EXIF orientation included.

Mirror a picture horizontally or vertically and save the flipped version.

Make a photo smaller with a quality dial you control, and see what it saved.

Strip the colour out of a photo, and adjust brightness and contrast while you are there.

Soften a whole picture by an amount you set, and save it blurred.

Turn PNG files into JPEGs, with a quality dial and a background for transparency.

Turn JPEGs into lossless PNG files, ready for editing or transparency.

Convert PNG files to WebP — much smaller, still transparent.

Turn WebP files into PNGs that older software will open, transparency intact.

Re-encode JPEGs as WebP to cut page weight without a visible change.

Turn WebP images into JPEGs that anything will accept.

Convert PNG to AVIF — the smallest of the modern formats, transparency included.

Re-encode JPEGs as AVIF for the smallest files a browser can make.

Combine PDFs into one document, in any page order, without uploading them.

Break one PDF into separate files, one per page, or pull out just the pages you need.

Turn sideways or upside-down pages the right way up, and save the rotation permanently.

Remove blank scans, cover sheets or anything else, and save what is left.

Pull out the pages you want as a new PDF, leaving the original alone.

Drag pages into the order you want and save the document that way.

Number the pages of a PDF, in the final order, without uploading it.

Reorder, rotate, duplicate and delete pages in one place, then save the result.

Build recurring calendar events and export them to an .ics file.

Open .vcf files, tidy the contacts and export them back.

Checksums for any number of files, in several algorithms at once, and which files are the same. Nothing is uploaded.

Passwords, UUIDs and random bytes, from the browser's own randomness.