Resize PNG Images Online
Resize any PNG in seconds — set exact pixel dimensions or scale by percentage while keeping crisp edges and full transparency. Everything happens in your browser: your images are never uploaded.
- Private — no upload
- No signup
- Free & unlimited
To resize a PNG online, drop it in, set a width and height in pixels (or a percentage), and download. Transparency is preserved, quality stays sharp, and the file never leaves your browser.
How to resize a PNG
- Drop your PNG. Drop your PNG into the box above, or click to browse.
- Set the size. Type exact width/height in pixels, or pick a percentage. Keep "lock ratio" on to avoid stretching.
- Download. Your resized PNG saves instantly, transparency intact.
Common PNG sizes
| Use case | Dimensions |
|---|---|
| Favicon | 32×32 / 512×512 |
| Profile picture | 400×400 |
| Web hero image | 1920×1080 |
| Email signature logo | 300×100 |
| Android app icon | 512×512 |
| Open Graph / social card | 1200×630 |
Keeping PNG transparency
Unlike JPG, PNG stores transparency in an alpha channel. ResizeMate preserves that channel, so logos, icons and cut-out graphics stay transparent after resizing instead of picking up a white box.
If your resized PNG suddenly has a white background, it was converted to JPG somewhere along the way — JPG has no way to store transparency, so it fills those pixels with white. Keep the output format as PNG, or use WebP if you need transparency in a smaller file.
Why is my PNG file so large?
PNG is lossless: it records every pixel exactly and compresses by finding repeated patterns rather than by discarding detail. That is excellent for flat colour, text and sharp edges, and wasteful for photographs, where almost no two neighbouring pixels are identical.
The usual culprits, in order of how much they cost you:
- A photo saved as PNG — converting it to JPG or WebP typically cuts 70–90% of the file size.
- A screenshot of photo-heavy content — same cause, same fix.
- Dimensions far larger than needed — a 4000 px wide PNG is rarely required on a web page.
- Transparency you never actually use — if nothing in the image is transparent, JPG will be much smaller.
Need transparency and a small file? WebP supports both — see JPG to WebP, or set a target size on Compress Image.
Why use ResizeMate
Private
Images are processed in your browser and never uploaded to a server.
Fast
No upload/download round-trip — results are instant on your device.
Free
No signup, no watermark, no limits.
Frequently asked questions
- How do I resize a PNG without losing quality?
- Resizing down preserves quality well; ResizeMate uses high-quality sampling so edges stay sharp and transparency is kept.
- Does resizing a PNG keep transparency?
- Yes — the transparent (alpha) background is preserved.
- Are my images uploaded to a server?
- No. Resizing happens 100% in your browser; files never leave your device.
- Is it free?
- Yes — free, unlimited, no signup, no watermark.
- Can I resize multiple PNGs at once?
- Yes — use the Bulk Image Resizer to resize many files at once.