Browser-first utilities

Tools that
do one thing
and shut up.

Free utilities that run entirely in your browser. No data leaving your machine. Import a file, get a result, export and move on.

No data leaves your browser
100% free
// all tools
⬡
Live
CSV Cleaner
Trim whitespace, remove duplicates, reorder or drop columns. Drag in a messy CSV, download a clean one.
csv import/export local
→
{ }
Live
JSON Formatter
Paste ugly JSON, get it pretty-printed or minified instantly. Basic key inspection included. No upload, all local.
json dev format
→
±
Live
Text Diff
Paste two blocks of text and see exactly what changed. Line-by-line, word-level highlighting. Export the diff as a report.
text diff compare
→
↓M
Live
Markdown → HTML
Write or paste Markdown, preview the output, copy the HTML snippet. Nothing stored, nothing sent.
markdown html convert
→
🔑
Live
Password Generator
Cryptographically random passwords with entropy meter. Bulk generate, set rules, copy instantly. Fully offline.
security offline crypto
→
€_
Live
Invoice Generator
Fill in sender, client, line items. Get a clean, print-ready PDF. Data lives in localStorage — your invoices, your machine.
invoice pdf localStorage
→
✓#
Soon
IBAN / VAT Validator
Validate and format IBANs and EU VAT numbers. Algorithm-based, no API call required. Bulk paste supported.
finance validate eu
⇄
Soon
Unit Converter
Weight, length, temperature, volume — with manual exchange rate input for currencies. Offline, instant, no fluff.
convert units offline

Why we
build this way.

Most tools want your email before they'll let you use them. Most tools have a "Pro" tier for the one thing you actually need. Most tools send your data to a server you don't control.

ZeroFluff Tools is the opposite of all that. Small, sharp, and honest.

01 Local-first. Your data never touches our servers because we don't have any involved in processing.
02 One job. Every tool solves exactly one problem. Nothing more, nothing less.
03 Import → export. The primary UX pattern. Drag in, transform, download. Done.
04 Vanilla stack. Runs in any browser, no build step, no dependencies.