Resize Images to Exact Dimensions
Resize JPG, PNG, and WebP images to exact pixel dimensions for social media, email attachments, and web uploads. Lock aspect ratio to keep proportions intact. Free, private, and browser-based.
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Supports JPG, PNG, WebP, GIF, BMP - up to 50 MB
Image resizing tips
Social media sizes
Instagram: 1080×1080, Facebook cover: 820×312, Twitter header: 1500×500. Set exact dimensions for perfect uploads.
Aspect ratio lock
Keep proportions intact when resizing. Change width and height auto-adjusts. No stretched or squished images.
Batch resizing
Upload up to 20 images at once and resize them all to the same dimensions in a single operation.
Format preservation
Output keeps the same format as your original. JPEG stays JPEG, PNG stays PNG, WebP stays WebP.
Why resize images?
Images straight from your camera or phone are often much larger than needed. A 12-megapixel photo is 4000×3000 pixels, far too big for web pages, social media posts, or email attachments. Resizing reduces file size while fitting platform requirements — and unlike quality-based compression, it's the right lever when the destination genuinely won't display more pixels than you're sending it, since there's nothing to gain from shipping detail nothing can show.
Social media platforms have specific dimension requirements. Instagram posts look best at 1080×1080, Facebook covers need 820×312, and Twitter headers are 1500×500. Uploading the wrong size means your image gets cropped or stretched by the platform's own resizer, which optimizes for its storage and delivery costs rather than your image's sharpness. Our resizer lets you set exact pixel dimensions so your images always look the way you intended.
All resizing runs directly in your browser using the Canvas API. Your images are never uploaded anywhere. The aspect ratio lock ensures proportions stay correct, and batch mode lets you resize up to 20 images at once.
- 1Upload your image. Drag and drop or click to select a JPG, PNG, WebP, GIF, or BMP image from your device.
- 2Set target dimensions. Enter the desired width and height in pixels. Enable aspect ratio lock to keep proportions intact.
- 3Download resized image. Click Resize and download your resized image. The file is processed locally. Nothing is uploaded.
Which dimensions for which situation
| Situation | Setting | Why |
|---|---|---|
| A camera photo (4000×3000+) headed for a web page | Resize to the display width first (e.g. 1200-1600px wide), then compress | A 4000px-wide image displayed at 800px CSS width is wasting roughly 6x the pixels — and therefore bytes — the browser will ever render; resizing removes that waste before compression even starts working on quality. |
| A profile photo or avatar for a specific platform | The platform's exact published dimensions (see the table below) | Uploading oversized and letting the platform's own server-side resizer handle it produces worse results than resizing yourself, since platform resizers optimize for their storage costs, not your image's sharpness. |
| A screenshot that needs to fit inside a fixed-width doc or slide | Resize to the exact width the document allows, keep aspect ratio locked | Locking the ratio avoids the single most common resizing mistake — stretching one dimension independently, which visibly distorts UI elements and text. |
| A small image (under 800px) that needs to look bigger | Enlarging is possible but expect softness — there's no substitute for original resolution | Resizing up interpolates new pixels from existing ones; it cannot invent detail that was never captured, so the result is smoother, not sharper. |
| Many product photos that all need identical dimensions | Batch mode, one target size, aspect ratio lock on | Consistent dimensions across a product catalog matter more for visual consistency than preserving each photo's original framing — the aspect-crop behavior keeps the same subject-to-frame relationship across all of them. |
Common social media dimensions
| Platform | Dimensions (px) |
|---|---|
| Instagram post (square) | 1080 × 1080 |
| Instagram story | 1080 × 1920 |
| Facebook cover photo | 820 × 312 |
| Twitter/X header | 1500 × 500 |
| LinkedIn banner | 1584 × 396 |
| YouTube thumbnail | 1280 × 720 |
Platforms adjust these figures occasionally — treat this as a starting point and verify against the platform's current help docs if pixel-perfect placement matters. If your target file size matters as much as its dimensions, resize first, then run the result through compress image.
Known limits
Enlarging an image beyond its original resolution cannot add detail that was never captured — the tool interpolates new pixel values from the surrounding original pixels, which produces a smoother, softer result rather than genuinely new sharpness. Resizing down has no such ceiling; you can always go smaller cleanly.
Resizing changes pixel dimensions, not file weight directly — a resized image can still be large if it's saved at high quality. If a specific file size matters (an upload cap, not just a pixel requirement), pair resizing with compression rather than expecting dimensions alone to solve it.
Frequently asked questions
What image formats are supported?
You can resize JPEG, PNG, WebP, GIF, and BMP images. JPEG, PNG, and WebP files keep their original format after resizing. GIF and BMP inputs are resized and exported as JPEG.
Does resizing reduce image quality?
Resizing to smaller dimensions is generally lossless for the visible content. When enlarging images, some softness may occur as new pixels are interpolated. The tool uses high-quality rendering (92% JPEG quality by default).
Can I resize multiple images at once?
Yes. You can upload up to 20 images in a single batch and resize them all to the same target dimensions. Each image is processed individually and can be downloaded separately.
Is my image sent anywhere to be resized?
No. Resizing draws your image onto an off-screen HTML Canvas at the new pixel dimensions and reads the result back out as a file — the entire operation is a browser API call, not a network request. There's no server component in this tool for an image to be sent to.
What are common image sizes for social media?
Instagram post: 1080×1080, Instagram story: 1080×1920, Facebook cover: 820×312, Twitter header: 1500×500, LinkedIn banner: 1584×396, YouTube thumbnail: 1280×720.
Learn more
From the blog
Why are my photos so large?
What actually makes a modern photo 5-15MB, and why resizing helps.