Convert files without uploading them.
Nutter converts images, video, and audio entirely in your browser with WebAssembly. Free, private, fast.
sunset.heic
4.2 MB · WebP
portrait.jpg
2.1 MB · AVIF
logo.png
812 KB · WebP
banner.tiff
8.7 MB · JPG
How it works
No accounts, no uploads, no fine print. The whole pipeline runs on the device you're holding.
Drop your files
Batch-drop anything from 120+ supported formats. No queues, no upload bars.
Converted on your device
WebAssembly codecs do the work locally. Your files never touch a server — we couldn't read them if we wanted to.
Download and go
Grab the results and close the tab. Once the page has loaded, everything works offline.
Pick a medium
All toolsNo files needed
Developer utilities
77+
Tools in the belt
120+
Formats supported
0
Bytes uploaded
100%
Local processing
Questions, answered
The short version: no uploads, no accounts, no fine print. The longer version, below.
Are my files really never uploaded?
Yes. The converters are WebAssembly codecs that run inside your browser tab. When you drop a file, it is read from disk into memory, transformed on your CPU, and handed back — the only network traffic is fetching the page itself. Once a tool page has loaded, it even works with your connection off.
Do I need an account?
No. Every tool works without signing in, without a quota, and without an email address. Accounts exist only for optional extras like billing, and the tools never ask for them.
Which formats can I convert?
Images today: HEIC, JPG, PNG, WebP, AVIF, GIF, SVG, TIFF, BMP, ICO, and more, including RAW files from phone cameras — see the full conversion index. Video and audio tools are in the works and will follow the same local-first design.
How large a file can I convert?
It depends on your device, not on us: processing happens in your browser's memory, so limits come from your browser and hardware. Batch tools process files one at a time to stay within those limits, and each tool page notes what it can handle.
What does it cost?
The tools are free to use. There is no metered usage, because usage costs us nothing — your device does the work.
Is there an API?
No. Everything runs client-side by design, so there is no server endpoint to call. The best way to integrate is to link people to a tool page; agents can read /llms.txt for an index of every tool.
Start with any file.
Pick a tool, drop your file, download the result. Nothing leaves your device.