Text Compression Tools

Compress text using LZ77/LZ-String — ideal for localStorage, cookies, and URL state. Base64, UTF-16 (localStorage-optimised), and URI Component output. Decompression mode included. Free online LZ-String compressor.

Compress a JSON object or string before storing in localStorage — shows space saved, UTF-16 char count, and % of 5 MB browser limit used. Ready-to-use code snippet included. Free online localStorage compression helper.

Estimate IndexedDB storage usage for JSON payloads using the structured clone algorithm — shows how much LZ-String compression reduces quota usage. Four-way size comparison with code snippet. Free online IndexedDB payload size estimator.

Compress cookie value strings using LZ-String and instantly see whether the compressed value fits within the 4096-byte browser cookie limit. Real-time size bar, Set-Cookie header preview, Base64 and URI Component output. Free online cookie compressor.

Compress any text with GZIP and encode to Base64 — produces a URL-safe compressed string for query params, cookies, and localStorage. Free online text compressor.

Compress CSS by removing whitespace, comments, redundant semicolons, and applying shorthand optimizations — hex color normalisation, zero-value shortening, font-weight shorthand. Free online CSS compressor.

Maximum HTML compression — removes all optional whitespace, collapses boolean attributes, strips comments, removes optional closing tags, and inlines style/script whitespace. Free online aggressive HTML compressor.

Compress inline SVGs, base64 images, and JSON data blocks embedded in HTML — shows per-asset savings and replaces each asset in the output HTML. Free online inline asset compressor.

Advanced CSS compression — merges duplicate selectors, removes vendor prefix duplicates, collapses shorthand properties, and strips all whitespace and comments. Free online advanced CSS compressor.

Strip whitespace, comments, and CDATA sections from XML — configurable options, shows byte savings and compression ratio. Free online XML compressor.

Remove blank lines, trailing whitespace, and unnecessary quoting from CSV — configurable options, shows byte savings and row count. Free online CSV compressor.

Strip comments and whitespace from Rust source files — preserves raw string literals (r"...", r#"..."#) and doc comments (///, //!). Free online Rust compressor.

Remove whitespace and comments from GraphQL schema and query files — single-line collapse mode for persisted queries, shows wire-size savings. Free online GraphQL compressor.

Minify GraphQL query strings and estimate wire size with and without GZIP — four-way size comparison (plain/GZIP × original/minified), single-line APQ mode. Free online GraphQL response compressor.

Strip TypeScript type annotations, interfaces, type aliases, and generics to produce clean JavaScript — shows compiled JS size vs original TS size. Free online TypeScript compressor.

Remove all whitespace from JSON and show exact byte savings — also shows GZIP wire size for true API transfer savings. Validates JSON as a side effect. Free online JSON compressor.

Compress Lottie animation JSON files by removing hidden layers, unused assets, empty properties, and whitespace — shows per-optimization KB savings. Compatible with lottie-web, lottie-react, lottie-react-native. Free online Lottie JSON compressor.

Minify JavaScript and generate a Source Map v3 file — download both the compressed .min.js and its .map file as a ZIP. Remove comments, collapse whitespace, remove console.log. Free online JS compressor with source map.

Remove comments and blank lines from YAML files — ideal for Kubernetes manifests, Helm charts, and CI/CD configs. Shows exact byte savings and line count reduction. Free online YAML compressor.

Strip blank lines, trailing spaces, HTML comments, and optional syntax from Markdown files — shows byte savings and line count reduction. Free online Markdown compressor.

Remove comments and blank lines from Go source files — preserves raw string literals, interpreted strings, and rune literals. Shows byte savings and line count reduction. Free online Go compressor.

Remove comments and blank lines from Terraform HCL files — preserves heredoc strings and template expressions. Shows byte savings and line count reduction. Free online Terraform HCL compressor.

Strip comments and whitespace from Apache .htaccess and httpd.conf files — preserves RewriteRule patterns. Shows byte savings and line count reduction. Free online Apache config compressor.

Remove comments and blank lines from .htaccess files — preserves RewriteRule patterns, shows byte savings, and includes directive analysis (RewriteRules, security headers, cache directives). Free online .htaccess compressor.

Convert YAML to minified JSON — typically 20–40% smaller wire size for configuration delivery APIs. Uses js-yaml for accurate parsing. Multi-document YAML support. Free online YAML to compact JSON compressor.

Remove comments and whitespace from PHP scripts — preserves heredoc/nowdoc strings, shows size reduction and compression ratio. Free online PHP compressor.

Strip comments and whitespace from C and C++ source files — preserves string literals, character literals, C++11 raw strings, and preprocessor directives. Shows byte savings and line count reduction. Free online C/C++ compressor.

Compress TSV files by removing blank lines and normalizing whitespace — shows exact byte savings, row count reduction, and validates column consistency. Free online TSV compressor.

Remove comments and excess whitespace from Swift source files — preserves raw strings, multi-line strings, and nested block comments. 6 configurable options. Free online Swift compressor.

Strip comments and blank lines from Kotlin source files — removes single-line, multi-line, and KDoc comments while preserving string literals. Shows size savings and line count reduction. Free online Kotlin compressor.

Strip comments and excess whitespace from R scripts — preserves string literals, removes # comments, blank lines, and trailing whitespace. Shows size reduction and line count savings. Free online R script compressor.

Consolidate RUN layers, remove comments, and compress Dockerfiles — reduces Docker image layer count and shows estimated layer size impact. Free online Dockerfile compressor.

Remove comments and blank lines from TOML config files — preserves all string literals and multi-line strings. Useful for embedded device configuration and CI/CD pipelines. Free online TOML compressor.

Remove comments and excess whitespace from Nginx config files — preserves string literals, shows size savings for config management repos. Free online Nginx config compressor.

Strip comments, blank lines, and trailing whitespace from robots.txt files — shows exact byte savings, directive count, and User-agent group count. Free online robots.txt compressor.

Paste code in any language and auto-detect syntax to apply the correct comment/whitespace stripping — supports 28 languages including JS, Python, Go, Rust, Swift, SQL, YAML, TOML, and more. Free online multi-language code compressor.

Compress WebSocket message payloads using permessage-deflate (RFC 7692) simulation — shows exact byte savings and bandwidth impact at scale. Supports DEFLATE, GZIP, and zlib. Free online WebSocket compressor.

Upload a CSS bundle and compress it — shows minified size, exact GZIP size, and Brotli size with ready-to-use nginx and Apache server configuration snippets. Free online CSS bundle compressor.