What this minifier does

Three modes — pick the language of your source. Each strips the obvious waste:

HTML — removes comments (except IE conditionals), collapses inter-tag whitespace, normalizes interior whitespace to single spaces.
CSS — removes comments, collapses whitespace, removes whitespace around { } : ; ,, strips redundant semicolons.
JavaScript — removes block and line comments (quote-aware), collapses whitespace around operators and delimiters. Does not rename variables or do tree-shaking — this is a whitespace minifier, not a bundler.

When this is the right tool

Quick inline minification for a snippet you're pasting into an email, blog post, or support ticket.
Shrinking a static HTML page without setting up a build pipeline.
Inspecting the minified output size before deciding if you need a real minifier.

Production JavaScript bundles — use esbuild, terser, swc, or your bundler's built-in minifier. They rename variables, hoist constants, eliminate dead code, and produce dramatically smaller output.
CSS with sourcemaps — use Lightning CSS, cssnano, or a PostCSS pipeline.
Complex HTML with embedded scripts/styles — html-minifier-terser does a more thorough job.

JSON Formatter — Format, validate, and beautify JSON online. 100% client-side — your data never leaves your browser.
Text Diff — Compare two text blocks line-by-line or word-by-word. Unified and split view. Shows added, removed, and changed segments with full color coding.
Markdown Preview — Live Markdown preview with GitHub-flavored syntax. Tables, task lists, code blocks, strikethrough. Side-by-side editor and rendered output.
SQL Formatter — Format and beautify SQL queries. 12 dialect options (PostgreSQL, MySQL, SQLite, MSSQL, BigQuery, Snowflake, and more). Keyword casing control.

Written by Mian Ali Khalid. Last updated 2026-04-25.