Image Resizer (Exact Pixels or Percent)

Resize a picture to exact pixels or a percentage in seconds. Proportions stay locked unless you unlock them, upscaling gets an honest warning, and the resized file downloads with its new dimensions in the name. Nothing is uploaded.

How to use it

Choose a pictureTap the box or drop a file in. Its current dimensions load into the fields.
Set the sizeType a width or height — the other side follows automatically — or tap 25%, 50%, 75%.
DownloadThe file saves as name-1600x1200.jpg style, so versions never overwrite each other.

Pixels are the size that matters

Every practical image-size problem is really a pixel problem. The form that wants "under 2 MB" is asking for fewer pixels. The profile photo that looks blurry was enlarged from too few. The page that loads slowly is serving 4000-pixel images into 400-pixel slots. Megabytes are the symptom; dimensions are the cause.

The useful working numbers: screens are 1–4 thousand pixels wide, so 1600 px covers a full-width web image, 1080 px covers Instagram, 800 px covers a document illustration. Print wants more — roughly 300 pixels per inch, so a 10×15 cm print uses about 1200×1800.

Locked proportions, and when to break them

A picture's width-to-height ratio is part of the picture; change one without the other and everything in it stretches. That is why the lock is on by default and follows your typing in either direction. The moment to unlock is when a format dictates both numbers — a 1200×630 link preview, a square avatar from a rectangular photo. Even then, cropping usually beats distorting; a crop tool is on the roadmap for exactly this.

Downscaling is free, upscaling is not

Shrinking a picture keeps it sharp — high-quality resampling averages the extra detail away cleanly, which is why the results here stay crisp. Enlarging is a different deal: the pixels that would carry the new detail were never captured, so software can only smooth between the ones that exist. This tool warns rather than refuses, because a small bump is often fine — but the warning is there because no resizer, anywhere, can genuinely add what the camera did not record.

Everything happens on your device: no upload, no account, and versions download with their dimensions in the filename so nothing gets overwritten.

Questions people ask

How do I resize without stretching or squashing?

Leave Keep proportions on — it is on by default. Change either side and the other follows the original ratio, so faces stay faces. Unlock it only when a specific format genuinely needs both dimensions, like a 1200×630 social card, and accept that the picture will distort unless you crop instead.

What size should a picture be for a website?

Match the largest size it will be displayed at. Full-width hero images: 1600–2000 px wide. Content images: 800–1200 px. Thumbnails: 300–400 px. Anything beyond that is bytes spent on detail no one sees — a 4000 px upload in an 800 px slot is pure waste.

Can I make a small picture bigger?

You can, and the tool will do it — with a warning. Enlarging cannot invent detail that was never captured, so the result is a softer version of the original. It is fine for a modest bump; a 200-pixel logo blown up to poster size will disappoint whatever tool does it.

Does resizing keep transparency?

Yes — PNG in, PNG out, transparency intact. WebP likewise. JPGs stay JPG. The format never changes behind your back; if you want a different format as well, run the result through the converter.

Why does the file get so much smaller when I resize down?

File size follows pixel count. Halving both dimensions leaves a quarter of the pixels, so roughly a quarter of the bytes. This is why resizing is the single most effective way to shrink a photo — more effective than any quality slider.

Is my picture uploaded?

No. Resizing happens on your device — instant, offline-capable, and private enough for documents and IDs.