How to resize an image (4 steps)
- 1. Add your images. Drag them in or tap to choose from your phone or computer.
- 2. Pick a size. Type pixels, choose a percentage, or tap a ready-made size for Instagram, YouTube, Facebook and more.
- 3. Click Resize. Everything happens on your device in a second or two.
- 4. Download. Save images one by one or all at once as a ZIP.
Image size cheat sheet
Common sizes used by popular platforms. Platforms change their recommendations from time to time, so check their help pages if something looks off.
| Use | Size (px) | Shape |
|---|---|---|
| Instagram post | 1080 × 1080 | Square |
| Instagram portrait | 1080 × 1350 | Tall |
| Story / Reel | 1080 × 1920 | Tall |
| YouTube thumbnail | 1280 × 720 | Wide |
| YouTube banner | 2560 × 1440 | Wide |
| Facebook cover | 851 × 315 | Wide |
| X (Twitter) header | 1500 × 500 | Wide |
| LinkedIn banner | 1584 × 396 | Wide |
| Profile picture | 400 × 400 | Square |
| Full HD | 1920 × 1080 | Wide |
Resize vs compress
Resizing changes the width and height in pixels. Compressing keeps the size but makes the file lighter. For the smallest file, resize first, then use the Image Compressor.
Keep proportions vs exact size
"Keep proportions" never distorts your photo. "Exact size" fills the frame you choose and trims the edges from the centre — perfect for profile pictures and thumbnails.
Frequently asked questions
How do I resize an image?
Drop your photo into the resizer above, type a new width and height (or pick a percentage or preset like Instagram post), then click Resize and download. It takes a few seconds.
Will resizing reduce my image quality?
Making an image smaller keeps it sharp — Pixnova uses high-quality smoothing. Making an image much bigger than the original can look soft, because no tool can invent detail that isn't there.
How do I resize without stretching or squashing?
Keep the lock icon on. Pixnova then keeps the original proportions. For an exact size like 1080×1080, choose 'Exact size' and the photo is cropped from the centre instead of stretched.
Are my photos uploaded?
No. Resizing happens inside your browser on your own device. Your images are never sent to a server — the Privacy Receipt confirms it.
Can I resize many images at once?
Yes. Add as many images as you like, apply one size to all of them, and download everything as a single ZIP.
What size should an Instagram post be?
1080×1080 px for square, 1080×1350 px for portrait and 1080×1920 px for Stories and Reels. All three are one-click presets in the resizer.
What size is a YouTube thumbnail?
1280×720 px (16:9). Use the YouTube thumbnail preset, then compress it if the file needs to be smaller.
Is the image resizer free?
Yes — completely free, no account, no daily limit and no watermark.
Read the full guide
How to resize an image for Instagram, YouTube & the web without losing quality