How to batch resize hundreds of images for free
Resize, rename and compress a whole folder at once on Windows, macOS or the command line, with no uploads and no paid software.
10guides published
Image Formatting & Compression
Almost every "why won't this upload" problem comes down to three things: the format, the dimensions, and the file weight. These guides explain all three in plain language, with the numbers you actually need.
Most searched in this section
- WebP vs PNG vs JPG
- Compress without losing quality
- Reduce file size in KB
- Resize without distortion
Guides in Image Formatting & Compression
Aspect ratios explained: 1:1, 4:5, 16:9 and why crops go wrong
What an aspect ratio really is, why platforms cut the top off your photos, and the safe-zone habit that stops it happening again.
SVG vs PNG for logos: which one to send and when
Why your logo looks fuzzy at large sizes, what an SVG actually is, and the three files every brand should have ready before anyone asks.
Transparent backgrounds: PNG, WebP and why yours keeps breaking
The reason your transparent logo arrives with a white box, which formats really support transparency, and how to check a file before you send it.
How to convert HEIC to JPG free on any device
Why your iPhone photos will not open on other computers, four free ways to convert HEIC to JPG, and the setting that stops the problem happening again.
DPI vs PPI: what actually matters when you print
Why 300 DPI is a myth on screens, how to work out the pixels a print job really needs, and what to do when the printer says your file is low resolution.
How to resize an image without distorting or blurring it
Why resized images go blurry or squashed, the arithmetic that prevents both, and the free tools that resize a single photo or a whole folder correctly.
How to reduce an image to an exact file size in KB
Forms that demand "under 200 KB" or "maximum 50 KB" have a fix that takes two minutes. Here is the method, the tools and the order to try them in.
How to compress images without losing quality
The quality settings, tools and order of operations that shrink an image by 70% while keeping it sharp, plus the mistakes that quietly ruin photos.
WebP vs PNG vs JPG: which format should you actually use?
A plain-English comparison of WebP, PNG and JPG with the exact situations each one wins, plus free ways to convert between them without a subscription.
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