Utill.net
Free online developer tools that run in your browser. Paste for live encode, format, hash, JSON, and convert—nothing uploaded to our servers. No signup.
Convert between text encodings and transfer-safe formats. Pick Base64 for binary-safe ASCII, URL encoding for query strings, Unicode escapes for logs, or JWT decode to inspect claims — without uploading your data.
Inspect network identity, generate strong passwords, try AES locally, or calculate subnets. These tools emphasize browser-side processing and clear limits — they are helpers, not a full security suite.
Create UUIDs, hashes, QR codes, slugs, lorem text, and IndexNow keys on demand. Results stay on your device unless you copy them elsewhere.
Pretty-print and validate structured text: JSON, YAML↔JSON, SQL, diffs, and case styles. Fix syntax issues before you paste into production configs.
Turn timestamps, cron expressions, CSS units, images, and aspect ratios into readable values — quickly and locally.
Pick colors and build palettes you can copy as HEX, RGB, HSL, or CSS variables for design handoff.
Estimate tokens, test regular expressions, and count strings for prompts and debugging — all client-side.
Convert HEIC or DNG photos, shrink images, merge or unlock PDFs, and print a WiFi QR — all in the browser. Files stay on your device; we do not crack unknown PDF passwords.