What each mode escapes

Mode	Escapes	Example
JSON	`"` `\` and control chars (\n, \t, …); non-ASCII optional	`He said "hi" → He said \"hi\"`
JavaScript	quote char, `\`, newlines; template mode also ` and `${`	`it's → it\'s`
HTML	`&` `<` `>`, optionally `"` `'` and non-ASCII	`a<b → a<b`
URL	reserved & unsafe chars → percent-encoding	`a b → a%20b`
Base64	everything → A, Z a, z 0-9 + / (UTF-8 safe)	`hi → aGk=`
SQL	single quote doubled (`''`); MySQL mode uses backslashes	`it's → it''s`
CSV	field quoted if it holds delimiter / quote / newline; `"` doubled	`a,b → "a,b"`
Regex	`. * + ? ^ $ ( ) [ ] { } \| \` optionally `-` `/`	`1+1 → 1\+1`
Unicode	chars → `\uXXXX` or `\u{…}` escapes	`é → é`

About String Escaper

String Escaper is a free, private browser tool for developers and writers. It escapes and unescapes strings across 9 modes: JSON, JavaScript, HTML, URL, Base64, SQL, CSV, regex, and Unicode. Everything runs locally on your device. Your text is never uploaded to a server, no sign-up is needed, and the tool works offline. Like every free tool by Digital Heroes, it has no limits and no cost.

What you can do

Escape and unescape JSON strings, with optional surrounding quotes and non-ASCII to \uXXXX.

Escape JavaScript strings in single, double, or template-literal quote style.

Encode and decode HTML entities, including quotes and numeric entities for non-ASCII characters.

Percent-encode URLs using encodeURIComponent or encodeURI, with optional + for spaces.

Encode and decode Base64, including URL-safe variant and MIME line-wrapping at 76 chars.

Escape SQL, CSV, and regex patterns with mode-specific options for delimiters and quoting style.

How to use String Escaper

Open String Escaper in your browser. No signup or install needed.

Choose a mode (JSON, HTML, URL, etc.) and a direction: Escape or Unescape.

Paste or type your text into the input box. The result appears instantly on the right.

Adjust any per-mode options (quote style, delimiter, URL-safe, etc.) to match your needs.

Copy or download the output. Your data stays on your device throughout.

Frequently asked questions

Is String Escaper free?

Yes, String Escaper is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. String Escaper runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does String Escaper do?

Escape & unescape strings for JSON, JS, HTML, URL, SQL, CSV, regex & unicode.

String Escaper

What each mode escapes

About String Escaper

What you can do

How to use String Escaper

Frequently asked questions

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