Images

Resize an image

Say the width, the height or the percentage. The picture is redrawn on this device at that size, in proportion, and you are shown what it measured before and what it measures now.

On this device

Choose the new size

Proportions are always kept. To change the shape of a picture rather than its size, crop it.

    Opened on this device · never transmitted

    What this tool does, exactly

    What it does
    Decodes the picture with your device's own codecs and draws it again at the size you asked for, keeping its proportions. A JPEG comes back a JPEG and a PNG comes back a PNG; anything else your browser can read comes back as a JPEG, because those are the two formats everything opens.
    Why it will not enlarge by default
    Because it cannot. Asking for 2000 pixels from an 800-pixel photograph does not find detail that was never recorded — it interpolates, producing a larger file of a softer picture. The request comes back with the size your picture actually is, and enlarging happens only when you switch it on.
    What it measures
    The dimensions and bytes of the file you gave it, the dimensions and bytes of the file it made, and the camera data in each. Every one of those numbers is read out of the actual bytes rather than predicted.
    What it removes
    The camera and rights blocks: the model, the lens, the exposure, the timestamp, the editing history and any GPS position. They are cut out of the finished file and the result is then measured, rather than being left to the browser — Safari copies those blocks into a re-drawn picture and Chrome does not, so trusting the encoder would have been true on a laptop and false on an iPhone. The colour profile is kept, because removing it would change what your photograph looks like.

    About this tool

    Will the picture be stretched or squashed?

    No. The proportions are always kept, whichever of the three ways you give the size: a width of 1000 on a 4:3 photograph produces 1000 × 750 and nothing else. Changing the shape of a picture is a different operation and it is called cropping — there is a page for it.

    Why will it not make my picture bigger?

    Because enlarging cannot add detail. A photograph 800 pixels wide holds 800 pixels of information; asked for 2000, any tool can only invent the pixels in between, and the result is a heavier file that looks softer than the original. So the request comes back saying what size your picture really is. If you need the larger canvas anyway — for a print layout that demands one — the option is there and it says what it is doing.

    Which size should I ask for?

    For anything going on a screen, the width is the number that matters: 1920 is a full desktop background, 1280 fits any web page, 800 is generous for an email. For an upload form with a size limit in megabytes rather than pixels, use the image compressor instead — it searches for the quality that fits under a size you name.

    Does resizing remove the location my phone recorded?

    Yes, along with the camera model, the lens, the exposure, the timestamp and any editing history. The blocks that hold them are cut out of the finished file, and the file is then measured: the result says how many bytes of that data were in the picture you gave it and how many are in the one you get back. It is done that way rather than left to the browser because browsers disagree — Safari copies those blocks into a re-drawn picture and Chrome does not, so a tool that assumed the re-draw was enough would be telling the truth on a laptop and not on an iPhone.

    Is the picture uploaded to be resized?

    No. The decoding and the redrawing both happen in this browser tab, and there is no server here to send anything to. Open your network panel while you use it, or disconnect from the internet after the page has loaded — the tool keeps working.

    More images tools · All 31 · How they work