The page arrives, then goes quiet
Opening a tool downloads a static page and the code that runs it. After that the network is not needed — there is no request carrying your content, because the work happens in the tab you are looking at.
Local-first
Text tools that never see your text.
12 small, fast tools for the everyday text jobs — editing, converting, comparing, cleaning up. Every one runs inside your own browser, so your drafts, logs, contracts and API keys stay on your machine.
Nothing is uploadedNo server ever receives what you type.
No accountNothing to sign up for, nothing to delete.
Fast, and works offlineStatic pages that keep working without a connection.
All 12 tools
Every tool is a single page that loads only what it needs. Pick one and it opens ready to use — no setup, no sign-in, no upload step.
Write and edit
A real editor, and the two searches you reach for inside one.
Online Notepad
Tabbed notepad that autosaves to your browser, not to a server.
editor.jamuny.com/Find and Replace
Replace across your text, with regex, whole-word and in-selection.
editor.jamuny.com/find-and-replace/Regex Tester
Live match highlighting, capture groups and a replace preview.
editor.jamuny.com/regex-tester/Convert and encode
Turn one format into another without pasting it into a stranger’s server.
Markdown to HTML
Side-by-side preview, then copy the HTML or download a full page.
editor.jamuny.com/markdown-to-html/JSON Formatter
Pretty-print, minify or validate. Errors name the line and column.
editor.jamuny.com/json-formatter/Base64 Encoder
Encode and decode with full Unicode — accents, CJK and emoji.
editor.jamuny.com/base64-encode-decode/URL Encoder
Percent-encode a query value, a whole URL, or decode either back.
editor.jamuny.com/url-encoder-decoder/Clean and compare
The list-wrangling jobs that otherwise mean opening a spreadsheet.
Remove Duplicates
Strip repeated lines and keep the order you pasted them in.
editor.jamuny.com/remove-duplicate-lines/Sort Lines
A to Z or Z to A, with item2 sorting before item10 as it should.
editor.jamuny.com/sort-text-lines/Case Converter
Upper, lower, title, sentence or inverted — without eating acronyms.
editor.jamuny.com/text-case-converter/Text Diff Checker
Compare two versions and see every added and removed line.
editor.jamuny.com/text-diff/Word Counter
Words, characters, sentences and reading time, live as you type.
editor.jamuny.com/word-counter/How local-first works
Most online tools are a form that posts your text to a server, does the work there, and sends a result back. These do the work where your text already is.
Your text stays on your device
Typing, matching, converting and comparing all run in your browser. The notepad saves documents to your browser’s own storage, so they survive closing the tab without ever being copied somewhere else.
You can check rather than trust
Open the network panel in your browser’s developer tools and use any tool here. Nothing carrying your text goes out. That is a claim you can verify in about ten seconds, which is the point of making it.
Questions
What does “nothing leaves your browser” actually mean?
Every tool runs as code inside the page you already downloaded. There is no backend that receives your text, because there is no backend at all. You can confirm it: open your browser’s network panel, use any tool, and watch that no request carries your content.
Do I need an account?
No, and there is nothing to sign up for. Without a server there is nobody to hold an account, which also means there is no password to leak and no export request to file if you change your mind.
Do these tools work offline?
Once a page has loaded, yes — the work happens on your device rather than over the network. The notepad also keeps your documents in your browser’s own storage, so they are still there the next time you open it.
Is it really free, and what is the catch?
The tools are free to use with no limits and no sign-up. They are cheap to run precisely because there is no server doing the work, which is what makes giving them away sustainable.
Why is each tool on a separate address?
Each one is a self-contained page that loads only what it needs, so a tool stays fast no matter how many others exist. It also means a link you share points at exactly the tool you meant.