Online Tools for Developers and Designers

Ten tools that each do one thing — converting, formatting, resizing, generating, testing. No signup, no watermarks, no limits.

IP Address Lookup

See your own IP, country and time zone, then look up any address or domain — range type, reverse DNS, A and AAAA records.

Beautify, minify and validate JSON, or browse it as a collapsible tree. Errors come with a line and column number.

Resize by pixels or percent, crop to center, and watch the file size fall as you move the quality slider.

Check that your mic works before a call: live input level, device details, and a short recording you can play back.

EAN, UPC, Code 128, Code 39, ITF-14, DataMatrix and PDF417 — with the check digit calculated and verified for you.

Convert between PNG, JPG, WebP and AVIF. Built for shrinking site assets, with the size difference shown for each file.

Turn one image into a full icon set, a web manifest and the HTML to paste into your head — as a ZIP or file by file.

Press keys and watch them light up on an on-screen layout. Shows which keys you have not tested yet, and their key codes.

Convert Unix timestamps to human-readable dates and back. See the current epoch time live.

Encode text to Base64 or decode Base64 strings. Supports standard and URL-safe Base64url.