Privacy first · Client-side · Co_Folio

All the Best Internet Utilities
and standalone tools

A production toolkit of focused utilities that run in your browser. Paste text, drop an image, or generate tags without creating an account. Your work stays on this device unless you explicitly run a public lookup.

127Standalone utilities
16Neon workbenches
0Required accounts
LocalDefault processing

Categories

Open a bench, then launch a glowing tool card.

SEO & Webmaster

Titles, schema, sitemaps, robots, snippets, and on-page checks that run from pasted content.

19 toolsOpen →

Domain & Diagnostics

URL, DNS, subnet, headers, and host diagnostics you can run without handing us a log.

10 toolsOpen →

Text & Content

Count, clean, compare, rewrite structure, and extract signals from writing.

15 toolsOpen →

Encode & Hash

Base64, hashes, JWT inspection, and reversible transforms computed locally.

9 toolsOpen →

Developer Tools

Formatters, regex, cron, configs, and data converters for everyday engineering.

12 toolsOpen →

CSS & Design

Color, contrast, gradients, shadows, and front-end snippets with live preview.

8 toolsOpen →

Image Tools

Compress, resize, convert, and encode images entirely on this device.

6 toolsOpen →

PDF & Documents

Build printable documents and invoices in the browser.

2 toolsOpen →

Codes & Links

QR codes, vCards, UTM links, tokens, and share targets.

6 toolsOpen →

Security & Privacy

Passwords, strength, TOTP seeds, and policy drafts generated locally.

6 toolsOpen →

Social & YouTube

Extract IDs, draft tags, count bios, and preview share cards.

5 toolsOpen →

Calculators & Units

Finance, health, percentage, and unit math with transparent formulas.

11 toolsOpen →

Date & Time

Timestamps, durations, business days, and time zones.

6 toolsOpen →

Business Generators

Invoices, signatures, and operational one-pagers.

3 toolsOpen →

Accessibility & Reference

Contrast, readability, HTTP status, MIME, and ASCII tables.

5 toolsOpen →

Local Assistants

Rule-based drafts for meta, outlines, and policies — no remote model.

4 toolsOpen →