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§ · free tool
String escaper. Both ways, nine formats.
Escape and unescape strings for JSON, JavaScript, HTML, URL, Base64, SQL, CSV, regex and Unicode. Every conversion runs on your device — no upload, no sign-up.
A free online tool by Digital Heroes🔒 Your text never leaves your browser. Nothing is uploaded.
What each format escapes
| Format | 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 |
§ 02 · what you can do
One tool, every escape.
Escape & unescape both waysEvery format runs in reverse too — flip a switch to decode JSON, HTML, URL, Base64 and the rest.
JSON & JavaScript stringsOptional surrounding quotes, single / double / template literals, and non-ASCII to
\uXXXX.HTML entities & URL encodingEncode quotes and numeric entities, or percent-encode with
encodeURIComponent / encodeURI.Base64, SQL & CSVUTF-8-safe Base64 (URL-safe + MIME wrap), standard or MySQL SQL escaping, RFC-style CSV quoting.
Regex & UnicodeEscape every regex metacharacter, or convert to
\uXXXX / \u{…} code-point escapes.Copy, download, swapOne-click copy, download the result as
.txt, or swap input and output to chain conversions.§ 03 · how to use it
Four steps, no install.
- Pick a format — JSON, JavaScript, HTML, URL, Base64, SQL, CSV, Regex or Unicode.
- Choose a direction: Escape → to encode, or ← Unescape to decode.
- Paste or type into the input box — the result appears instantly on the right.
- Tune any per-format options, then Copy or Download the output.
§ 04 · faq
Frequently asked questions.
Is the String Escaper free?
Yes — completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is my text uploaded anywhere?
No upload, ever. Every conversion runs entirely in your browser on your own device — your text never leaves your computer and nothing is sent to a server.
Does it work offline?
Yes — once the page has loaded, every format keeps working without a connection because all the escaping logic runs locally in JavaScript.
Which formats does it support?
Nine: JSON, JavaScript, HTML entities, URL percent-encoding, Base64, SQL, CSV, regular-expression patterns and Unicode escapes. Each one escapes and unescapes.
What is the difference between JSON and JavaScript escaping?
JSON always uses double quotes and a fixed escape set. JavaScript mode lets you choose single, double or template-literal quotes — template mode also escapes the backtick and
${ interpolation marker.Does Base64 handle emoji and non-English text?
Yes — the Base64 encoder is UTF-8 aware, so emoji and any non-ASCII characters round-trip correctly. You can also switch to the URL-safe variant or wrap lines at 76 characters for MIME.
Published · Last updated .
