diff --git a/datasette/static/app.css b/datasette/static/app.css
index 80eda0e3..34eb122c 100644
--- a/datasette/static/app.css
+++ b/datasette/static/app.css
@@ -166,22 +166,32 @@ form input[type=search] {
         width: 95%;
     }
 }
-form input[type=submit] {
-    color: #fff;
-    background-color: #007bff;
-    border-color: #007bff;
+form input[type=submit], form button[type=button] {
     font-weight: 400;
     cursor: pointer;
     text-align: center;
     vertical-align: middle;
-    border: 1px solid blue;
+    border-width: 1px;
+    border-style: solid;
     padding: .5em 0.8em;
     font-size: 0.9rem;
     line-height: 1;
     border-radius: .25rem;
+}
+
+form input[type=submit] {
+    color: #fff;
+    background-color: #007bff;
+    border-color: #007bff;
     -webkit-appearance: button;
 }
 
+form button[type=button] {
+    color: #007bff;
+    background-color: #fff;
+    border-color: #007bff;
+}
+
 .filter-row {
     margin-bottom: 0.6em;
 }
diff --git a/datasette/static/sql-formatter-2.3.3.min.js b/datasette/static/sql-formatter-2.3.3.min.js
new file mode 100644
index 00000000..8f5c7e9f
--- /dev/null
+++ b/datasette/static/sql-formatter-2.3.3.min.js
@@ -0,0 +1,5 @@
+/* sql-formatter 2.3.3
+ * Copyright (c) 2016-present ZeroTurnaround LLC. (MIT Licensed)
+ */
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.sqlFormatter=t():e.sqlFormatter=t()}(this,function(){return function(e){function t(n){if(E[n])return E[n].exports;var r=E[n]={exports:{},id:n,loaded:!1};return e[n].call(r.exports,r,r.exports,t),r.loaded=!0,r.exports}var E={};return t.m=e,t.c=E,t.p="",t(0)}([function(e,t,E){"use strict";function n(e){return e&&e.__esModule?e:{default:e}}t.__esModule=!0;var r=E(24),o=n(r),T=E(25),R=n(T),N=E(26),i=n(N),A=E(27),I=n(A);t.default={format:function(e,t){switch(t=t||{},t.language){case"db2":return new o.default(t).format(e);case"n1ql":return new R.default(t).format(e);case"pl/sql":return new i.default(t).format(e);case"sql":case void 0:return new I.default(t).format(e);default:throw Error("Unsupported SQL dialect: "+t.language)}}},e.exports=t.default},function(e,t,E){var n=E(12),r="object"==typeof self&&self&&self.Object===Object&&self,o=n||r||Function("return this")();e.exports=o},function(e,t,E){function n(e){return null==e?void 0===e?N:R:i&&i in Object(e)?o(e):T(e)}var r=E(9),o=E(48),T=E(57),R="[object Null]",N="[object Undefined]",i=r?r.toStringTag:void 0;e.exports=n},function(e,t,E){function n(e,t){var E=o(e,t);return r(E)?E:void 0}var r=E(39),o=E(50);e.exports=n},function(e,t,E){"use strict";function n(e){return e&&e.__esModule?e:{default:e}}function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}t.__esModule=!0;var o=E(74),T=n(o),R=E(8),N=n(R),i=E(21),A=n(i),I=E(22),O=n(I),u=E(23),S=n(u),a=function(){function e(t,E){r(this,e),this.cfg=t||{},this.indentation=new A.default(this.cfg.indent),this.inlineBlock=new O.default,this.params=new S.default(this.cfg.params),this.tokenizer=E,this.previousReservedWord={},this.tokens=[],this.index=0}return e.prototype.format=function(e){this.tokens=this.tokenizer.tokenize(e);var t=this.getFormattedQueryFromTokens();return t.trim()},e.prototype.getFormattedQueryFromTokens=function(){var e=this,t="";return this.tokens.forEach(function(E,n){e.index=n,E.type===N.default.WHITESPACE||(E.type===N.default.LINE_COMMENT?t=e.formatLineComment(E,t):E.type===N.default.BLOCK_COMMENT?t=e.formatBlockComment(E,t):E.type===N.default.RESERVED_TOPLEVEL?(t=e.formatToplevelReservedWord(E,t),e.previousReservedWord=E):E.type===N.default.RESERVED_NEWLINE?(t=e.formatNewlineReservedWord(E,t),e.previousReservedWord=E):E.type===N.default.RESERVED?(t=e.formatWithSpaces(E,t),e.previousReservedWord=E):t=E.type===N.default.OPEN_PAREN?e.formatOpeningParentheses(E,t):E.type===N.default.CLOSE_PAREN?e.formatClosingParentheses(E,t):E.type===N.default.PLACEHOLDER?e.formatPlaceholder(E,t):","===E.value?e.formatComma(E,t):":"===E.value?e.formatWithSpaceAfter(E,t):"."===E.value?e.formatWithoutSpaces(E,t):";"===E.value?e.formatQuerySeparator(E,t):e.formatWithSpaces(E,t))}),t},e.prototype.formatLineComment=function(e,t){return this.addNewline(t+e.value)},e.prototype.formatBlockComment=function(e,t){return this.addNewline(this.addNewline(t)+this.indentComment(e.value))},e.prototype.indentComment=function(e){return e.replace(/\n/g,"\n"+this.indentation.getIndent())},e.prototype.formatToplevelReservedWord=function(e,t){return this.indentation.decreaseTopLevel(),t=this.addNewline(t),this.indentation.increaseToplevel(),t+=this.equalizeWhitespace(e.value),this.addNewline(t)},e.prototype.formatNewlineReservedWord=function(e,t){return this.addNewline(t)+this.equalizeWhitespace(e.value)+" "},e.prototype.equalizeWhitespace=function(e){return e.replace(/\s+/g," ")},e.prototype.formatOpeningParentheses=function(e,t){var E=[N.default.WHITESPACE,N.default.OPEN_PAREN,N.default.LINE_COMMENT];return E.includes(this.previousToken().type)||(t=(0,T.default)(t)),t+=e.value,this.inlineBlock.beginIfPossible(this.tokens,this.index),this.inlineBlock.isActive()||(this.indentation.increaseBlockLevel(),t=this.addNewline(t)),t},e.prototype.formatClosingParentheses=function(e,t){return this.inlineBlock.isActive()?(this.inlineBlock.end(),this.formatWithSpaceAfter(e,t)):(this.indentation.decreaseBlockLevel(),this.formatWithSpaces(e,this.addNewline(t)))},e.prototype.formatPlaceholder=function(e,t){return t+this.params.get(e)+" "},e.prototype.formatComma=function(e,t){return t=this.trimTrailingWhitespace(t)+e.value+" ",this.inlineBlock.isActive()?t:/^LIMIT$/i.test(this.previousReservedWord.value)?t:this.addNewline(t)},e.prototype.formatWithSpaceAfter=function(e,t){return this.trimTrailingWhitespace(t)+e.value+" "},e.prototype.formatWithoutSpaces=function(e,t){return this.trimTrailingWhitespace(t)+e.value},e.prototype.formatWithSpaces=function(e,t){return t+e.value+" "},e.prototype.formatQuerySeparator=function(e,t){return this.trimTrailingWhitespace(t)+e.value+"\n"},e.prototype.addNewline=function(e){return(0,T.default)(e)+"\n"+this.indentation.getIndent()},e.prototype.trimTrailingWhitespace=function(e){return this.previousNonWhitespaceToken().type===N.default.LINE_COMMENT?(0,T.default)(e)+"\n":(0,T.default)(e)},e.prototype.previousNonWhitespaceToken=function(){for(var e=1;this.previousToken(e).type===N.default.WHITESPACE;)e++;return this.previousToken(e)},e.prototype.previousToken=function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:1;return this.tokens[this.index-e]||{}},e}();t.default=a,e.exports=t.default},function(e,t,E){"use strict";function n(e){return e&&e.__esModule?e:{default:e}}function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}t.__esModule=!0;var o=E(66),T=n(o),R=E(63),N=n(R),i=E(8),A=n(i),I=function(){function e(t){r(this,e),this.WHITESPACE_REGEX=/^(\s+)/,this.NUMBER_REGEX=/^((-\s*)?[0-9]+(\.[0-9]+)?|0x[0-9a-fA-F]+|0b[01]+)\b/,this.OPERATOR_REGEX=/^(!=|<>|==|<=|>=|!<|!>|\|\||::|->>|->|~~\*|~~|!~~\*|!~~|~\*|!~\*|!~|.)/,this.BLOCK_COMMENT_REGEX=/^(\/\*[^]*?(?:\*\/|$))/,this.LINE_COMMENT_REGEX=this.createLineCommentRegex(t.lineCommentTypes),this.RESERVED_TOPLEVEL_REGEX=this.createReservedWordRegex(t.reservedToplevelWords),this.RESERVED_NEWLINE_REGEX=this.createReservedWordRegex(t.reservedNewlineWords),this.RESERVED_PLAIN_REGEX=this.createReservedWordRegex(t.reservedWords),this.WORD_REGEX=this.createWordRegex(t.specialWordChars),this.STRING_REGEX=this.createStringRegex(t.stringTypes),this.OPEN_PAREN_REGEX=this.createParenRegex(t.openParens),this.CLOSE_PAREN_REGEX=this.createParenRegex(t.closeParens),this.INDEXED_PLACEHOLDER_REGEX=this.createPlaceholderRegex(t.indexedPlaceholderTypes,"[0-9]*"),this.IDENT_NAMED_PLACEHOLDER_REGEX=this.createPlaceholderRegex(t.namedPlaceholderTypes,"[a-zA-Z0-9._$]+"),this.STRING_NAMED_PLACEHOLDER_REGEX=this.createPlaceholderRegex(t.namedPlaceholderTypes,this.createStringPattern(t.stringTypes))}return e.prototype.createLineCommentRegex=function(e){return RegExp("^((?:"+e.map(function(e){return(0,N.default)(e)}).join("|")+").*?(?:\n|$))")},e.prototype.createReservedWordRegex=function(e){var t=e.join("|").replace(/ /g,"\\s+");return RegExp("^("+t+")\\b","i")},e.prototype.createWordRegex=function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:[];return RegExp("^([\\w"+e.join("")+"]+)")},e.prototype.createStringRegex=function(e){return RegExp("^("+this.createStringPattern(e)+")")},e.prototype.createStringPattern=function(e){var t={"``":"((`[^`]*($|`))+)","[]":"((\\[[^\\]]*($|\\]))(\\][^\\]]*($|\\]))*)",'""':'(("[^"\\\\]*(?:\\\\.[^"\\\\]*)*("|$))+)',"''":"(('[^'\\\\]*(?:\\\\.[^'\\\\]*)*('|$))+)","N''":"((N'[^N'\\\\]*(?:\\\\.[^N'\\\\]*)*('|$))+)"};return e.map(function(e){return t[e]}).join("|")},e.prototype.createParenRegex=function(e){var t=this;return RegExp("^("+e.map(function(e){return t.escapeParen(e)}).join("|")+")","i")},e.prototype.escapeParen=function(e){return 1===e.length?(0,N.default)(e):"\\b"+e+"\\b"},e.prototype.createPlaceholderRegex=function(e,t){if((0,T.default)(e))return!1;var E=e.map(N.default).join("|");return RegExp("^((?:"+E+")(?:"+t+"))")},e.prototype.tokenize=function(e){for(var t=[],E=void 0;e.length;)E=this.getNextToken(e,E),e=e.substring(E.value.length),t.push(E);return t},e.prototype.getNextToken=function(e,t){return this.getWhitespaceToken(e)||this.getCommentToken(e)||this.getStringToken(e)||this.getOpenParenToken(e)||this.getCloseParenToken(e)||this.getPlaceholderToken(e)||this.getNumberToken(e)||this.getReservedWordToken(e,t)||this.getWordToken(e)||this.getOperatorToken(e)},e.prototype.getWhitespaceToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.WHITESPACE,regex:this.WHITESPACE_REGEX})},e.prototype.getCommentToken=function(e){return this.getLineCommentToken(e)||this.getBlockCommentToken(e)},e.prototype.getLineCommentToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.LINE_COMMENT,regex:this.LINE_COMMENT_REGEX})},e.prototype.getBlockCommentToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.BLOCK_COMMENT,regex:this.BLOCK_COMMENT_REGEX})},e.prototype.getStringToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.STRING,regex:this.STRING_REGEX})},e.prototype.getOpenParenToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.OPEN_PAREN,regex:this.OPEN_PAREN_REGEX})},e.prototype.getCloseParenToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.CLOSE_PAREN,regex:this.CLOSE_PAREN_REGEX})},e.prototype.getPlaceholderToken=function(e){return this.getIdentNamedPlaceholderToken(e)||this.getStringNamedPlaceholderToken(e)||this.getIndexedPlaceholderToken(e)},e.prototype.getIdentNamedPlaceholderToken=function(e){return this.getPlaceholderTokenWithKey({input:e,regex:this.IDENT_NAMED_PLACEHOLDER_REGEX,parseKey:function(e){return e.slice(1)}})},e.prototype.getStringNamedPlaceholderToken=function(e){var t=this;return this.getPlaceholderTokenWithKey({input:e,regex:this.STRING_NAMED_PLACEHOLDER_REGEX,parseKey:function(e){return t.getEscapedPlaceholderKey({key:e.slice(2,-1),quoteChar:e.slice(-1)})}})},e.prototype.getIndexedPlaceholderToken=function(e){return this.getPlaceholderTokenWithKey({input:e,regex:this.INDEXED_PLACEHOLDER_REGEX,parseKey:function(e){return e.slice(1)}})},e.prototype.getPlaceholderTokenWithKey=function(e){var t=e.input,E=e.regex,n=e.parseKey,r=this.getTokenOnFirstMatch({input:t,regex:E,type:A.default.PLACEHOLDER});return r&&(r.key=n(r.value)),r},e.prototype.getEscapedPlaceholderKey=function(e){var t=e.key,E=e.quoteChar;return t.replace(RegExp((0,N.default)("\\")+E,"g"),E)},e.prototype.getNumberToken=function(e){return this.getTokenOnFirstMatch({input:e,type:A.default.NUMBER,regex:this.NUMBER_REGEX})},e.prototype.getOperatorToken=function(e){return 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diff --git a/datasette/templates/_codemirror.html b/datasette/templates/_codemirror.html
index 237d6907..17342be5 100644
--- a/datasette/templates/_codemirror.html
+++ b/datasette/templates/_codemirror.html
@@ -1,3 +1,4 @@
+<script src="/-/static/sql-formatter-2.3.3.min.js" defer></script>
 <script src="/-/static/codemirror-5.31.0.js"></script>
 <link rel="stylesheet" href="/-/static/codemirror-5.31.0-min.css" />
 <script src="/-/static/codemirror-5.31.0-sql.min.js"></script>
diff --git a/datasette/templates/_codemirror_foot.html b/datasette/templates/_codemirror_foot.html
index 4b55bf8d..9bc6d97f 100644
--- a/datasette/templates/_codemirror_foot.html
+++ b/datasette/templates/_codemirror_foot.html
@@ -1,5 +1,18 @@
 <script>
-    var editor = CodeMirror.fromTextArea(document.getElementById("sql-editor"), {
+window.onload = () => {
+    const sqlFormat = document.querySelector("button#sql-format");
+    const readOnly = document.querySelector("pre#sql-query");
+    const sqlInput = document.querySelector("textarea#sql-editor");
+    if (sqlFormat && !readOnly) {
+        sqlFormat.hidden = false;
+    }
+    if (readOnly) {
+        readOnly.innerHTML = sqlFormatter.format(readOnly.innerHTML);
+    }
+    if (sqlInput) {
+        sqlInput.value = sqlFormatter.format(sqlInput.value);
+    }
+    var editor = CodeMirror.fromTextArea(sqlInput, {
       lineNumbers: true,
       mode: "text/x-sql",
       lineWrapping: true,
@@ -10,4 +23,10 @@
       },
       Tab: false
     });
+    if (sqlInput && sqlFormat) {
+        sqlFormat.addEventListener("click", ev => {
+            editor.setValue(sqlFormatter.format(editor.getValue()));
+        })
+    }
+}
 </script>
diff --git a/datasette/templates/database.html b/datasette/templates/database.html
index a934f336..a0d0fcf6 100644
--- a/datasette/templates/database.html
+++ b/datasette/templates/database.html
@@ -26,7 +26,10 @@
     <form class="sql" action="{{ database_url(database) }}" method="get">
         <h3>Custom SQL query</h3>
         <p><textarea id="sql-editor" name="sql">{% if tables %}select * from {{ tables[0].name|escape_sqlite }}{% else %}select sqlite_version(){% endif %}</textarea></p>
-        <p><input type="submit" value="Run SQL"></p>
+        <p>
+            <button id="sql-format" type="button" hidden>Format SQL</button>
+            <input type="submit" value="Run SQL">
+        </p>
     </form>
 {% endif %}
 
diff --git a/datasette/templates/query.html b/datasette/templates/query.html
index 7c6c59f3..34fa78a5 100644
--- a/datasette/templates/query.html
+++ b/datasette/templates/query.html
@@ -37,7 +37,7 @@
         {% if editable and config.allow_sql %}
             <p><textarea id="sql-editor" name="sql">{% if query and query.sql %}{{ query.sql }}{% else %}select * from {{ tables[0].name|escape_sqlite }}{% endif %}</textarea></p>
         {% else %}
-            <pre>{% if query %}{{ query.sql }}{% endif %}</pre>
+            <pre id="sql-query">{% if query %}{{ query.sql }}{% endif %}</pre>
         {% endif %}
     {% else %}
         <input type="hidden" name="sql" value="{% if query and query.sql %}{{ query.sql }}{% else %}select * from {{ tables[0].name|escape_sqlite }}{% endif %}">
@@ -49,7 +49,10 @@
             <p><label for="qp{{ loop.index }}">{{ name }}</label> <input type="text" id="qp{{ loop.index }}" name="{{ name }}" value="{{ value }}"></p>
         {% endfor %}
     {% endif %}
-    <p><input type="submit" value="Run SQL"></p>
+    <p>
+        <button id="sql-format" type="button" hidden>Format SQL</button>
+        <input type="submit" value="Run SQL">
+    </p>
 </form>
 
 {% if display_rows %}