📐 Image Resizer
Resize JPG, PNG and WebP images to exact pixels, a percentage, or a ready-made size for Instagram, YouTube and more — with aspect-ratio lock and fit modes. Free, instant & 100% private.
Resize to exact pixels, scale by percentage, or pick a ready-made size for Instagram, YouTube and more.
Resize Exactly How You Need
Precise pixel control, social presets and fit modes — all without a single image leaving your browser.
Pixel-Perfect
Type exact width and height, or scale by percentage — with optional aspect-ratio lock so nothing gets squashed.
Ready-Made Presets
One tap for Instagram, YouTube thumbnails, X, LinkedIn, avatars and standard HD/4K sizes.
Smart Fit Modes
Stretch, Fit or Fill control exactly how your image fills a new shape — no surprise distortion or awkward crops.
Convert & Optimize
Output as JPG, PNG or WebP with a quality slider, so resizing and optimizing happen in one step.
Live Preview & Stats
See the resized image, its new dimensions, megapixels, aspect ratio and file size before you download.
Private & Free
100% in your browser — nothing is uploaded. No login, no limits, dark mode, responsive down to 280px.
How to Resize an Image
Four steps — the preview updates the moment you change a number.
Add an image
Drag and drop or tap to choose a JPG, PNG or WebP — its original size is shown right away.
Set the size
Enter pixels, pick a percentage, or tap a preset. Keep the lock on to preserve proportions.
Choose fit & format
If the shape changes, pick Fit or Fill, and select your output format and quality.
Preview & download
Check the live preview and new file size, then download your resized image.
Frequently Asked Questions
How to resize, quality and upscaling, aspect ratio, fit modes, social sizes, formats and privacy.
How do I resize an image?
Drop in an image, then type the width or height you want in pixels — with the lock on, the other dimension follows automatically to keep the proportions. You can also scale by a percentage or tap a preset like 'Full HD' or 'IG Square'. The preview and new file size update instantly, then hit Download.
Does resizing reduce quality?
Making an image smaller (downscaling) keeps it sharp — you're discarding pixels you didn't need. Making it bigger (upscaling) can't add real detail, so it tends to look soft or blurry, because the tool has to invent pixels by interpolation. For best results, resize down from a high-resolution original rather than enlarging a small one.
What is 'lock aspect ratio'?
Aspect ratio is the relationship between width and height (like 16:9). With the lock on, changing one dimension automatically adjusts the other so your image keeps its shape and doesn't look squashed or stretched. Unlock it only when you deliberately want a different shape — and use a fit mode to control how that's handled.
What's the difference between Stretch, Fit and Fill?
They decide what happens when your target shape differs from the original. Stretch forces the image into the new box (which can distort it). Fit (contain) scales the whole image to sit inside the box, adding padding around it. Fill (cover) scales it to cover the box completely and crops the overflow. Fill is great for thumbnails; Fit preserves the whole picture.
How do I resize an image for Instagram or YouTube?
Use the Social media presets. One tap sets the exact recommended size — 1080×1080 for an Instagram square, 1080×1920 for a Story, 1280×720 for a YouTube thumbnail, and so on. If the preset's shape differs from your photo, switch to Fill to crop neatly or Fit to keep everything visible.
Can I change the file format too?
Yes. Pick JPG, PNG or WebP for the output. WebP usually gives the smallest file at the same quality; PNG is lossless and best for graphics or transparency; JPG is the classic choice for photos. There's a quality slider for the lossy formats so you can balance size and sharpness.
Is there a limit on image size or is my photo uploaded?
Nothing is uploaded — the resize happens entirely in your browser, so your photo never leaves your device and there's no server limit to worry about. Very large images use more of your device's memory, but everyday photos resize in an instant, even on a phone.
Why resize images at all?
Smaller images load faster on websites, use less data, attach more easily to email, and fit the exact dimensions platforms expect. Uploading a 12-megapixel phone photo where a 1080-pixel image is needed just wastes bandwidth and slows the page — resizing fixes that in seconds.