Free Tool
Image tools built for the browser — no Photoshop, no upload
Resize, convert, compress, and optimise images without leaving your dev environment.
The problem
Optimising images for web projects means juggling Photoshop, ImageMagick, Squoosh, and a half-dozen other tools. When a designer hands you a 4 MB PNG and you need a 200 kB WebP, that shouldn't take more than 30 seconds.
The NSS solution
NSS provides a free browser-based image toolkit: resize to exact dimensions, convert between PNG/WebP/AVIF/JPG, compress with quality control, strip EXIF metadata, and remove backgrounds. Everything runs locally — no upload, no CLI, no dependencies.
How to use it
- 1
Resize images to spec
Drag an oversized image into the Image Resizer, enter your target width and height, and download. Aspect ratio lock prevents stretching.
- 2
Convert to WebP or AVIF for performance
PNG and JPG files are often 2–5× larger than equivalent WebP. Use the Format Converter to batch convert hero images, thumbnails, and icons before deployment.
- 3
Compress for Core Web Vitals
The Image Compressor shows you before/after size with a quality slider so you can find the exact file size target for LCP optimisation.
- 4
Strip EXIF before shipping
Any image taken on a smartphone has GPS and device metadata embedded. The Metadata Remover strips all of it in one step — no server needed.
- 5
Remove backgrounds for UI assets
The AI background remover processes PNG, JPG, WebP, and AVIF — useful for extracting subjects from reference photos for UI components.
Step-by-step guide
- 1
Open the tool you need
All tools are available at /tools. Common dev workflow: Resize → Format Convert → Compress.
- 2
Drag and drop your image
No upload. The image stays in your browser tab — useful when working with assets you can't send to a cloud service.
- 3
Adjust the output settings
Set exact pixel dimensions for resize, choose target format, and set quality for compression.
- 4
Download and use
Download goes directly to your machine. No account, no watermark, no wait.
- 5
Repeat for your batch
Process images one at a time or use the Batch Processor for multiple files at once.
Common questions
Does NSS have a CLI or API?
No — NSS runs entirely in the browser. For automated pipelines, tools like ImageMagick or Sharp (Node.js) are the right choice. NSS is for manual optimisation tasks where you need visual feedback.
What formats can I convert between?
PNG, WebP, AVIF, and JPG. AVIF produces the smallest files but has slightly less browser support than WebP. Use WebP for maximum compatibility in modern browsers.
Is there any size limit?
No hard limit, but browser memory constrains very large files. Images up to 8000 × 8000 px work reliably in most browsers.
Does it preserve transparency when converting?
Yes for PNG → WebP and PNG → AVIF. Transparency is lost when converting to JPG (the transparent area becomes white or black depending on the renderer).
Ready to try it?
No account. No subscription. No images uploaded to any server.
Remove a background free →