Resize an image
Set the exact width and height you need, without squashing the picture. Nothing is uploaded.
Free · No sign-up · Your file never leaves your computer
No file handy? — generated here, not downloaded.
How to use it
- 1
Choose an image. Its real size fills in automatically.
- 2
Type a width or a height — the other follows, so the picture keeps its shape.
- 3
Or pick a preset if you are hitting a known size.
- 4
Download.
When you would use this
Resizing is usually somebody else's requirement: a profile picture that must be square, a header that must be 1200 by 630, an upload that refuses anything over 2000 pixels wide.
Keep the ratio locked unless you have a reason not to. The commonest way to ruin a photo in a tool like this is to type both numbers, get a picture that is subtly too tall, and not notice until it is published. With the lock on, one number is enough — the other follows, and the picture keeps its shape. Unlock it only when a platform genuinely demands exact dimensions and you have accepted the distortion.
Making things smaller works. Making them bigger does not. Shrinking discards detail the new size cannot show, which is harmless. Enlarging has to invent detail that was never captured, so a 400-pixel image stretched to 2000 is a soft, mushy 400-pixel image — it will not become sharp because you asked for more pixels. If you need bigger, go back to the original.
Format is preserved rather than forced. A PNG comes back as a PNG, with its transparency intact; anything else comes back as JPEG on a white ground, because JPEG has no alpha channel and would otherwise render transparent areas black.
If your goal is a smaller file rather than smaller dimensions, resizing is still usually the better lever — a photo displayed 800 pixels wide gains nothing from being 4000 wide, and removing that costs you nothing visible. Compression, by contrast, throws away detail people can see.
Questions
- Why do both numbers change when I type one?
- The ratio is locked, which keeps the picture from being squashed. Unlock it if a platform demands exact dimensions and you accept the distortion.
- Can I make a small image bigger and sharper?
- Bigger yes, sharper no. Enlarging invents pixels rather than recovering detail. A small image scaled up is a soft version of the same image — go back to the original if you have it.
- Will my transparent PNG stay transparent?
- Yes. PNGs come back as PNGs with transparency intact. Other formats come back as JPEG on white, because JPEG cannot store transparency.
- Should I resize or compress to make the file smaller?
- Resize first. Removing pixels nobody can see costs you nothing visible; compression throws away detail people can see.
- Is my image uploaded?
- No. It is resized inside your browser and never sent anywhere.
Related tools
Resizing the same photograph for the fourth time
Ofivio keeps site photographs at full quality against the project they belong to, so every export comes from the original rather than from a copy of a copy.
See Ofivio