Resize PNG

How to Resize PNG Images Online

1. Upload Your PNG Image: Click "+ Add Files" or drag a PNG onto the page. Only the first file you pick is loaded — this editor works on one image at a time, not a batch queue.
2. Set Width and Height: Enter pixel values, choose a percentage (10-200%), or pick a preset resolution from the dropdown. Toggle the aspect-ratio lock to keep proportions or release it to stretch to exact dimensions.
3. Pick the Output Mode (Optional): Keep PNG to preserve full alpha transparency, or switch the output extension to JPG/WebP from the format dropdown if a smaller transparent (WebP) or fully opaque (JPG) file is acceptable.
4. Resize and Download: Click "Resize". Processing happens locally in your browser — no sign-up, no watermark.

Why Resize PNG Images?

PNG is a lossless raster format defined by W3C, with full 8-bit alpha transparency. Re-encoding a resized PNG does not introduce JPEG-style compression artifacts, so the only quality change comes from the resampling step itself. That makes PNG the right format to resize when you need a smaller pixel grid but cannot tolerate compression noise around hard edges (UI assets, screenshots, logos, line art). Common reasons to resize:

• Hit a platform's exact dimension spec — favicons at 16x16, 32x32, and 192x192, the Apple Touch Icon at 180x180, Android maskable at 512x512, or Open Graph cards at 1200x630 (Meta's recommended size, 1.91:1 aspect ratio).
• Cut page weight without losing transparency — a 4000-pixel hero PNG displayed at 1200 pixels wastes bandwidth and slows Largest Contentful Paint. Downscaling to the rendered size typically shrinks files 5-10x.
• Fit attachment caps — Gmail caps single attachments at 25 MB, and Outlook.com at 20 MB; downscaling a multi-megapixel screenshot fixes "file too large" errors instantly.
• Match design-system grids — product thumbnails at 300x300, hero banners at 1920x1080, sidebar icons at 64x64. Locked aspect ratio prevents the distortion you get when you scale by one dimension only.
• Print at a specific physical size — at 300 DPI a 1200x1800 PNG is exactly 4x6 inches; the resize step sets the pixel grid your print driver expects.
• Strip oversized screen captures — Retina/HiDPI screenshots come out at 2x or 3x the logical resolution; resizing back to 1x makes documentation files manageable.

Common PNG Resize Presets

Resize vs Crop vs Compress — Which Tool Do You Actually Need?

Frequently Asked Questions

Will I lose quality resizing a PNG?

PNG itself is lossless, so re-encoding adds no artifacts — but resampling does. Downscaling produces clean results because the algorithm averages neighboring pixels into one output pixel. Upscaling has to invent pixels that were never captured, so even a good interpolator (bicubic, Lanczos) softens edges. For photographic content, start with the largest source you have and scale down once.

Is transparency preserved?

Yes. PNG supports 8-bit alpha (256 levels of partial transparency), and the resize step keeps the alpha channel intact. Anti-aliased edges on logos, drop shadows, and feathered cutouts come through correctly. If you export to JPG instead, transparency is flattened against an opaque background — pick WebP if you need transparency in a smaller file.

How do I keep the aspect ratio?

Toggle the aspect-ratio lock and enter either the width or the height — the other dimension fills in automatically using the source ratio. To deliberately stretch (rare, usually a mistake on photos), unlock the ratio and enter both dimensions manually.

What dimensions should I use for a favicon?

Modern sites ship at least three PNGs: 32x32 for desktop browser tabs, 180x180 for the Apple Touch Icon, and 192x192 plus 512x512 for Android and PWA manifests. A 16x16 PNG is still useful for legacy IE/older Edge support. After resizing, bundle the small sizes into a single.ico with PNG to ICO.

What size should an Open Graph image be?

Meta's documentation recommends 1200 x 630 pixels at a 1.91:1 ratio, with an 8 MB file-size ceiling. The same dimensions work for LinkedIn (technically 1200x627). Twitter/X's "summary large image" card wants 1200 x 675 (16:9). PNG is accepted, but if file weight matters consider exporting to JPG since OG images rarely need transparency.

Why is the resized PNG still large?

Resizing only changes the pixel grid. Pixel count drives most of the file size, but PNG also stores a full alpha channel and uses lossless DEFLATE compression — for photos, the resulting file can still be heavy. If the file is too big after resize, run it through Compress PNG (palette quantization can cut size 5-10x) or convert to PNG to WebP.

Can I resize multiple PNGs to the same dimensions?

Not on this page — the editor holds one image at a time; resize it, save, then + Start New for the next file. For a real batch — the same width, height, or percentage applied to a whole set of files in one session — use Compress PNG, which runs server-side and includes a resize step alongside compression. If the source files have different aspect ratios and you keep the lock on there, each file scales to fit within the entered bounds — they won't be stretched to a single shape.

What about upscaling — can I make a small PNG larger?

You can, but expect softness. Standard interpolation (bicubic, Lanczos) fills new pixels by averaging existing ones, so detail that wasn't in the source can't reappear. For logos and line art the result is usually acceptable; for photos, a dedicated AI upscaler will do better than any classical resizer.

Are my files uploaded anywhere?

Processing happens locally in your browser. There's no public link, no account requirement, and no third-party sharing.