Resize Image Online Free — Change Image Dimensions

Resize Any Image to Exact Dimensions

Need a specific image size for a website, social media, or print? MyPDF's Image Resizer lets you change dimensions precisely — by pixels, percentage, or preset sizes.

How to Resize an Image

Step 1: Upload Your Image

Open the Resize Image tool and upload your image (JPG, PNG, WebP, BMP, TIFF, GIF).

Step 2: Set Dimensions

Choose your resize method:

• Exact pixels — Set width and height (e.g., 1200 x 630)


• Percentage — Scale to 50%, 75%, 200%, etc.


• Lock aspect ratio — Change one dimension, the other adjusts automatically

Step 3: Download

Click "Resize" and download your resized image.

Common Image Sizes

Social Media

Platform	Image Type	Size (px)
Instagram Post	Square	1080 x 1080
Instagram Story	Vertical	1080 x 1920
Facebook Post	Landscape	1200 x 630
Twitter/X Post	Landscape	1600 x 900
LinkedIn Post	Landscape	1200 x 627
YouTube Thumbnail	Landscape	1280 x 720
Pinterest Pin	Vertical	1000 x 1500

Web and Email

Use	Size (px)
Website banner	1920 x 600
Blog featured image	1200 x 630
Email header	600 x 200
Favicon	32 x 32 or 16 x 16
App icon	512 x 512

Documents and Print

Use	Size (px at 300 DPI)
Passport photo	600 x 600
ID photo	413 x 531
A4 page	2480 x 3508
Letter page	2550 x 3300

Tips

1. Always lock aspect ratio — Prevents stretching and distortion
2. Don't upscale too much — Enlarging a small image beyond 200% causes visible blurriness
3. Compress after resizing — Use Compress Image for smaller file sizes
4. Crop, don't stretch — If you need a different aspect ratio, use Crop Image first
5. Batch resize — Upload multiple images to resize them all to the same dimensions

Frequently Asked Questions

Does resizing reduce quality?

Downscaling (making smaller) generally looks fine. Upscaling (making larger) can look blurry beyond 2x the original size.

Can I resize without changing aspect ratio?

Yes — lock the aspect ratio and change just the width or height. The other dimension adjusts automatically.

What formats are supported?

JPG, PNG, WebP, BMP, TIFF, GIF, and more.

Is it free?

100% free — no sign-up, no watermarks.

Related Tools

• Compress Image — Reduce file size after resizing
• Crop Image — Cut to a specific aspect ratio
• Convert Image — Change format (PNG to JPG, etc.)
• DPI Adjustment — Change print resolution
• JPG to PDF — Create PDFs from resized images