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.

Turn a picture into a data URI you can paste straight into CSS, HTML or JSON.

Turn one picture into favicon.ico and the PNG icons a site needs, with the tags to paste.

Read the exact colour of any pixel as HEX, RGB or HSL, and build a palette by clicking.

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.

Save every page of a PDF as a JPEG image, at the size you choose.

Save every page of a PDF as a PNG, with text and lines kept sharp.

Turn photos into one PDF, in the order you set, on the paper size you pick.

Put screenshots or graphics into one PDF, in order, without losing a pixel.

Stamp text across every page — DRAFT, CONFIDENTIAL, a name — at the angle and weight you set.

Trim the margins off every page — as a percentage, so it works on pages of different sizes.

Read and rewrite the title, author, subject and keywords a PDF carries — or empty them all.

Make an audio file smaller by re-encoding it, with the quality you choose.

Cut a clip out of a recording by choosing where it starts and ends.

See the real codec, bitrate, sample rate, channels and length of any audio file.

Put several recordings end to end as one file, in the order you set.

Raise a quiet recording as loud as it will go without clipping, and see by how much.

Draw the waveform of a track as a PNG, in the colour and style you pick.

Turn uncompressed WAV recordings into MP3s a tenth of the size.

Decode MP3s to uncompressed WAV for editing software that insists on it.

Turn M4A and AAC files from a phone or Apple device into MP3s.

Turn lossless FLAC albums into MP3s that fit on a phone or in a car.

Turn OGG and Opus files into MP3s that play everywhere.

Turn raw AAC streams into MP3 files that every player will open.

Halve the size of a WAV without losing a single sample.

Unpack a lossless FLAC into the WAV that older software insists on.

Fold two channels into one, halving the size of a recording that never needed both.

Give a single-channel file the two channels some software and hardware require.

Re-encode a file at a higher or lower quality, and see what it costs in size.

Resample a file to 44.1 kHz, 48 kHz or lower, for software that wants a specific rate.

Make a video file smaller by re-encoding it, at the resolution and quality you choose.

Cut a clip out of a recording by choosing where it starts and ends.

Trim the edges off the picture, with the kept region drawn over a real frame.

Change a video to 1080p, 720p or smaller, keeping its shape.

Turn a sideways or upside-down clip the right way up, permanently.

Mirror a clip left-to-right, which is what a selfie camera needs undone.

Strip the soundtrack out of a clip and keep the picture exactly as it was.

Speed a clip up or slow it down, from a quarter speed to four times.

Put your name or a label over every frame, in the corner you choose.

See the real resolution, codec, frame rate, bitrate, rotation and length of any video.

Pull still frames out of a video as JPEGs, spread evenly across it.

Turn a clip into a sequence of still pictures, as many as you ask for.

Put several clips end to end as one file, in the order you set.

Pull the soundtrack out of a video and save it as an MP3.

Save a video's soundtrack on its own, in any audio format you like.

Re-encode an MP4 as WebM with VP9 and Opus, for a smaller file on the web.

Turn a WebM into an H.264 MP4 that plays on essentially everything.

Turn QuickTime and iPhone recordings into MP4s that open anywhere.

Turn Matroska files into MP4s that phones, TVs and editors will open.

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.