JSON Visualizer
Messy API response in, readable JSON out
26 free tools · no sign-up
Developer tools that just open and work.
Format JSON, test APIs, build regex, convert images, record your screen, and more: 26 focused tools that open instantly in your browser.
Paste anything
Opens the right tool/
It detects what you paste and routes it to the right tool.
Try one:
- No account needed
- Files stay on your device
- Free to use
Popular:JSON to FormVideo DownloaderImage PlaceholderSmart Regex Builder
Popular jobs
See them at work
Small tools that each do one job well.
Every tool opens straight into the task: paste, drop or type, and get the result. Here are a few of them in motion.
Video Downloader
Paste a link, pick a quality, save it
Compress PDF
Shrinks scans and photos in the file
Regex Builder
See every match as you type
QR Codes
Make codes and scan them
Color System
One color, a full palette
Local-first
Your files don't make a round trip.
Most online tools upload your file, work on it on their server and send it back. Almost every useSignal tool does the work inside your browser tab instead, so your JSON, PDFs, images and recordings stay on your device.
23/26 tools run entirely in your browser
0 sign-ups or accounts needed
0 of your files sent to us
The two exceptions: the Video Downloader fetches videos through our server, and Image Placeholder's share links are served from it.
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Browser-native tools for fast developer workflows
useSignal keeps practical developer utilities close to the browser: local-first JSON tools, API testing, regex building, image optimization and conversion, PDF compression, video editing, screen and voice recording, design token generation, focus sessions, and quick reset tools.