PNG Size Converter – Free Online Tool for Any Dimension

A PNG size converter lets you change the dimensions of a PNG file — making it wider, narrower, taller, or shorter — and optionally change its format. This is different from a PNG compressor: a converter changes pixel dimensions, while compression reduces file size while keeping the same dimensions.

When to use a PNG size converter

• Web development: Thumbnails, icons, and hero images need specific pixel sizes.
• Social media: Each platform has fixed display dimensions. PNG logos and graphics need resizing to fit.
• Print preparation: Converting a large web PNG to exactly 300 × 300 px for a product label.
• Email: PNG signatures and logo images need to be under specific sizes for email clients.

PNG file size vs PNG dimensions

These are related but different:

• Dimensions: Width × height in pixels (e.g., 1200 × 800 px). A size converter changes these.
• File size: How many bytes/KB/MB the file takes on disk. Changing dimensions directly affects file size.

PNG files are lossless — they store all pixel data. A 1200 × 800 PNG of a photograph might be 2–4 MB. Resizing to 600 × 400 (halving each dimension) drops the pixel count by 75% and the file size proportionally, resulting in approximately 500–1000 KB.

PNG vs JPG vs WebP: which format after converting?

• Keep PNG: If the image has transparency (alpha channel), sharp text, or geometric shapes. PNG is lossless — no quality degradation.
• Convert to JPG: If the image is a photograph with no transparency. JPG is 5–10× smaller than PNG for photos.
• Convert to WebP: Best option for most web use cases. WebP is 25–50% smaller than JPG for photos, 25–35% smaller than PNG for graphics, and supports transparency.

How to convert PNG size with Resizo

1. Open Resizo in your browser — no sign-up needed.
2. Drop your PNG file onto the tool.
3. The current dimensions display automatically.
4. Enter your target width. The height adjusts proportionally (or disable aspect ratio lock for freeform resize).
5. Choose output format: PNG (keep lossless), JPG (smaller for photos), or WebP (smallest).
6. Download the converted file.

Common PNG size conversion targets

• Logo for website header: 200 × 60 px, PNG (transparent background)
• Profile photo: 400 × 400 px, PNG or JPG
• Social media post: 1080 × 1080 px, PNG or WebP
• Favicon: 32 × 32 px or 64 × 64 px, PNG
• Email signature logo: 200 × 80 px, PNG