FastMinify — Minify, convert, encode and format code online
Your browser-based developer tools platform. Minification remains our foundation — then pick format converters, JSON utilities, or encoding helpers. Every tool runs locally in your browser with the same privacy guarantees.
Minify
Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.
Minify JS
Shrink JavaScript bundles before CDN deploy—Terser-backed minification never leaves your tab.
Minify CSS
Compress CSS with CSO/CSSO trimming comments and redundancy while respecting cascade semantics.
Minify HTML
Tighten HTML documents for quicker first paint yet keep inline CSS/JS and structured snippets stable.
Minify SVG
Strip comments, whitespace and metadata elements from SVG — a light in-browser minify, not path or precision rewrite.
Minify JSON
Ship compact JSON payloads and logs—ideal when APIs must stay slim without another backend hop.
Minify XML
Lighten RSS envelopes, SOAP chunks, multilingual sitemaps and configs while CDATA survives intact.
Minify YAML
Compress YAML configs for K8s, CI/CD and Docker Compose — optional comment preservation.
Minify SQL
Compress SQL queries for production — strip comments and whitespace while preserving string literals.
Minify TOML
Compress TOML configs for Cargo.toml and pyproject.toml — optional comment preservation.
Unminify
Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.
Unminify JS
Expand minified JavaScript back to readable lines when debugging production bundles.
Unminify CSS
Restore formatting on compressed CSS to trace cascade rules and overrides.
Unminify HTML
Unminify HTML to inspect inline scripts, attributes and nested templates.
Unminify SVG
Unminify SVG paths and attributes when auditing vector assets.
Unminify JSON
Prettify compact JSON logs and API responses for quick structural scanning.
Unminify XML
Expand minified XML feeds and configs into readable documents.
Unminify YAML
Restore readable formatting from minified YAML configs for reviews and debugging.
Unminify SQL
Restore readable formatting from minified SQL queries for audits and debugging.
Unminify TOML
Restore readable formatting from minified TOML configs for reviews and debugging.
Unminify TypeScript
Restore readable TypeScript from minified one-line scripts.
Unminify SCSS
Unminify compressed SCSS into readable Sass.
Unminify LESS
Unminify compressed LESS into readable CSS preprocessor code.
Conversion
Transform data between JSON, YAML, XML and CSV locally — no server uploads.
HTML
Convert HTML to JSON, XML, YAML and Markdown.
HTML → XML
Turn HTML tags and attributes into XML in the browser — nothing is uploaded.
HTML → JSON
Scrape HTML tables and lists into JSON objects for scraping workflows and data migration.
HTML → YAML
Lift HTML structure into YAML drafts when moving content into GitOps or static-site configs.
HTML → Markdown
Transform HTML articles into Markdown for docs sites, READMEs and CMS migrations.
JSON
Convert JSON to YAML, XML, CSV, TOML, TSV, SQL, HTML, Properties and INI — all in your browser.
JSON → YAML
Convert JSON exports into skim-friendly YAML for Compose manifests, IaC excerpts or onboarding docs.
JSON → XML
Emit XSD-friendly XML snippets from JSON when partners still hinge on namespaces and angle brackets.
JSON → CSV
Flatten JSON tables into spreadsheets with dotted headings that mirror nesting from your payloads.
JSON → TOML
Convert JSON objects to TOML for Cargo.toml, pyproject.toml and DevOps configs — local only.
JSON → TSV
Export JSON tables to tab-separated values for spreadsheets and analytics tools that prefer TSV over CSV.
JSON → SQL
Generate INSERT statements or SQL-friendly rows from JSON payloads for quick DB seeding and migration mocks.
JSON → HTML
Render JSON structures into HTML tables or lists for reports and email-friendly previews.
JSON → Properties
Emit Java .properties key=value files from JSON configs for Spring, Gradle and legacy JVM stacks.
JSON → INI
Turn JSON settings into INI sections and keys for Windows apps, PHP and lightweight config files.
JSON → TOON
Convert JSON to TOON and compare tokens plus input cost vs JSON.
TOON → JSON
Decode TOON to pretty JSON with strict validation by default.
YAML
Convert YAML to JSON, XML, CSV, TOML, TSV, Properties and INI — cross-target TOML via Properties → TOML and INI → TOML in alsoLinks.
YAML → JSON
Lock YAML excerpts into deterministic JSON schemas before CI scanners or gateways reject ambiguity.
YAML → XML
Promote Helm-like YAML blocks into interoperable XML for legacy gateways that forbid JSON.
YAML → CSV
Harvest tabular snippets from YAML for finance or ops spreadsheets without shipping data server-side.
YAML → TOML
Transform YAML configs into TOML through a JSON intermediate — no server uploads.
YAML → TSV
Extract tabular snippets from YAML into TSV for ops spreadsheets without server-side ETL.
YAML → Properties
Generate flat Java .properties from YAML maps — nested YAML blocks error instead of flattening.
YAML → INI
Generate INI from object-shaped YAML — root arrays and sequences fail with a clear message.
XML
Convert XML to YAML, CSV, JSON, TOML, TSV and HTML.
XML → YAML
Soften brittle XML-heavy pipelines into approachable YAML drafts your team can review quickly.
XML → CSV
Leverage the internal XML→JSON→CSV funnel so spreadsheets inherit predictable analytic columns.
XML → JSON
Unpack RSS buckets, SAML-ish payloads or giant configs into REST-friendly structures you can grep.
XML → TOML
Route XML configs through JSON into TOML for Rust, Python and modern toolchain manifests.
XML → TSV
Flatten XML documents into tab-separated rows for quick spreadsheet analysis.
XML → HTML
Transform XML trees into readable HTML tables or outlines for documentation previews.
CSV
Convert CSV to JSON, XML, YAML, TOML and TSV.
CSV → JSON
Turn spreadsheet mocks into validated JSON blobs before ingestion services ingest the dataset.
CSV → XML
Generate deterministic XML per row swap for brittle B2B drops that still sniff for tags.
CSV → YAML
Preview GitOps-ready YAML from CSV pilots ahead of widening infrastructure changes.
CSV → TOML
Promote CSV pilot data into TOML configs for Cargo.toml-style project settings.
CSV → TSV
Swap comma delimiters for tabs when downstream tools insist on TSV instead of CSV.
TSV
Convert tab-separated values to JSON and CSV.
SQL
Parse INSERT statements to JSON and CSV.
Markdown
Convert Markdown to HTML locally.
TOML
Convert TOML to JSON, YAML, XML, CSV, Properties and INI.
TOML → JSON
Parse TOML into strict JSON for APIs, CI gates and interoperability checks.
TOML → YAML
Turn TOML configs into readable YAML for GitOps-style reviews.
TOML → XML
Serialize TOML configs into XML for gateways and partners that still require angle-bracket payloads.
TOML → CSV
Flatten TOML tables into CSV columns for finance or ops reviews in spreadsheets.
TOML → Properties
Flat TOML to Java .properties — nested TOML tables rejected with a clear error.
TOML → INI
TOML to INI with one-level [sections] — deep nesting may stringify without error.
Properties
Convert Java .properties files to JSON, YAML, INI and TOML.
Properties → JSON
Parse Java .properties files into JSON for Spring configs, i18n bundles and CI validation.
Properties → YAML
Emit YAML from .properties while keeping dotted keys flat — GitOps migration without a manual JSON hop.
Properties → INI
Export Java .properties to flat INI lines — niche direct path alongside YAML and TOML migration.
Properties → TOML
Move .properties to TOML with flat dotted root keys — Spring or Cargo migration helper.
INI
Convert INI configs to JSON, YAML, Properties (flat INI only) and TOML.
INI → JSON
Convert INI sections and keys into nested JSON for modern config management and APIs.
INI → YAML
Turn INI sections into nested YAML mappings for Ansible, Kubernetes values or GitOps repos.
INI → Properties
Flat INI only to Java .properties — sectioned INI must use INI → TOML or INI → YAML.
INI → TOML
INI sections to TOML tables — strong path for legacy config toward Cargo or pyproject.
Encoding
Encode or decode Base64, URL components and HTML entities — client-side only.
Base64
Encode Unicode text binaries or decode JWT segments without juggling CLI flags on shared machines.
URL encode
Percent-encode query components or full URIs — encodeURIComponent, encodeURI, or x-www-form-urlencoded scopes.
URL decode
Decode percent-encoded query strings and URLs — untangle flaky query triples and broken deep links.
HTML entities
Neutralise user-provided literals before injecting them into markup or reversing escaped payloads.
Image to Base64
Convert a local image to Base64 or data URI (32 MiB) — PNG, JPEG, GIF, WebP, SVG.
JWT Encode
Sign compact HS256 JWTs from JSON claims — convenience expiry presets, no verification.
JWT Decode
Inspect JWT header and payload as JSON without signature verification — nothing leaves your browser.
Hash Generator
Generate SHA-256, SHA-512, MD5 and other digests from text — client-side checksums for dev workflows.
HMAC Generator
Sign messages with HMAC-SHA-256/384/512 — hex or base64url, client-side API signing helper.
Serialization
Serialize and deserialize PHP data structures beside JSON workflows.
JSON Tools
Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.
JSON Validator
Check JSON syntax with precise error locations before you ship configs or API fixtures.
JSON Formatter
Prettify JSON with consistent indentation when readability matters more than byte count.
JSON Tree Viewer
Browse JSON as a collapsible tree with search — ideal for exploring configs and API payloads.
JSONPath Tester
Test JSONPath expressions with filters, wildcards, and tree highlighting — Classic and RFC 9535 dialects.
JSON Repair
Fix broken JSON syntax locally — trailing commas, unquoted keys — then validate before shipping.
JSON Diff
Spot structural differences between two JSON documents during reviews or regression checks.
JSON Merge
Merge two JSON documents with deep or shallow strategy, array controls, and conflict preview — browser-local.
JSON Sort
Sort object keys and arrays recursively — alphabetical, natural, or numeric order for canonical, diff-friendly JSON.
JSON Escape
Escape or unescape string literals for safe JSON embedding — tabs for both directions, no server uploads.
JSON Unescape
Restore escaped JSON string literals to readable text — ideal after copy-paste from configs, APIs or logs.
JSON → TypeScript
Generate TypeScript interfaces or types from JSON samples — client-side, ideal for API fixtures.
SVG Tools
Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.
Validate SVG
Check SVG syntax, viewBox presence and basic accessibility hints before shipping.
SVG Viewer
Preview SVG on grid, light or dark backgrounds and inspect width, height and viewBox instantly.
Optimize SVG
Run SVGO presets locally to squeeze SVG exports beyond whitespace-only minification.
Resize SVG
Fix width, height and viewBox issues when responsive SVG scaling behaves strangely.
SVG to Data URI
Generate a compact SVG data URI plus ready-to-paste CSS background-image snippet.
SVG to JSX
Convert raw SVG markup into a React-friendly component with camelCase attributes.
Beautify
Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.
Beautify JS
Format JavaScript with consistent indentation — readable structure for reviews and debugging.
Beautify CSS
Beautify CSS stylesheets with clear nesting and spacing before sharing or committing.
Beautify HTML
Prettify HTML markup for easier inspection of templates and email fragments.
Beautify SVG
Format SVG markup for hand-editing icons and illustrations without losing structure.
Beautify JSON
Format JSON with readable indentation when payloads need human review, not compression.
Beautify XML
Beautify XML configs and feeds with consistent indentation for diff-friendly reviews.
Beautify YAML
Format YAML with consistent indentation and quote control — ideal for DevOps configs.
Beautify SQL
Format SQL with dialect support, keyword casing and readable indentation — client-side privacy.
Beautify TOML
Format TOML with consistent indentation — ideal for Rust and Python project configs.
Beautify TypeScript
Format TypeScript with Prettier — beautify and unminify.
Beautify SCSS
Format SCSS/Sass with consistent indentation.
Beautify LESS
Format LESS stylesheets online with Prettier.
Beautify Markdown
Format Markdown README and docs with consistent spacing.
Beautify GraphQL
Format GraphQL schemas and queries with standard indentation.
CSS preprocessors
Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.
Color & CSS Tools
Paste-local WCAG contrast checking with modern CSS color syntax — pair and matrix views, never uploaded.
WCAG Color Contrast Checker
WCAG 2.2 contrast on a pair or matrix — OKLCH and color() paste, optional APCA beta overlay, shareable URL.
Color Converter
Paste any CSS color and get HEX, RGB(A), HSL(A), HWB, LAB, LCH, OKLAB, OKLCH, and color() at once — alpha and gamut aware.
PX / REM / EM Converter
Paste a px, rem, or em length and get all three units at once — customizable base font size, live reference table.
Color Shades & Tints Generator
Paste a color and get live Tints and Shades scales toward white and black — adjustable steps, HEX/RGB/HSL output.
DevOps & Infra
Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.
Format Terraform
Beautify Terraform/HCL with preserved comments and consistent indent.
Validate Terraform
Live HCL syntax check with line/column errors — no cloud API.
Minify Terraform
Compact HCL snippets by removing extra whitespace.
Format Dockerfile
Normalize Dockerfile instructions and spacing locally.
Lint Dockerfile
Hadolint-style DL rules plus syntax validation in the browser.
Validate Docker Compose
YAML parse plus Compose services structure checks.
Validate ENV
Parse .env files, catch invalid lines and duplicate keys.
CI/CD
GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.
Format GitHub Actions
Beautify GitHub Actions workflow YAML with 2-space indent (comments not preserved).
Validate GitHub Actions
Structural checks for on, jobs and steps — not full actionlint.
Format GitLab CI
Format .gitlab-ci.yml with 2-space indent (js-yaml round-trip).
Validate GitLab CI
Structural checks for stages, jobs and script/trigger — not a GitLab runner.
Logs & observability
Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.
Format JSON Logs
Pretty-print a JSON document or normalize NDJSON — indent for single documents only.
Filter JSON Logs
Filter NDJSON by level and substring — invalid lines skipped or kept.
Validate NDJSON
Validate NDJSON: report counts or extract valid lines.
Access Log to Table
Parse combined/common access logs into CSV or TSV.
Kubernetes
Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.
Format Kubernetes YAML
Pretty-print multi-document Kubernetes YAML with indent 2 or 4 — comments dropped.
Validate Kubernetes YAML
Structural checks for apiVersion, kind, metadata, and kind-specific rules — not cluster dry-run.
Generate Kubernetes Ingress
Scaffold networking.k8s.io/v1 Ingress from host, path, and Service — pair with generate Deployment.
Generate Kubernetes Deployment
Scaffold apps/v1 Deployment from image, replicas, and port — pair with generate Ingress.
Format Helm values.yaml
Pretty-print Helm values.yaml; rejects K8s manifests — does not run helm template.
Networking / IP
CIDR, subnets, and IPv4/IPv6 helpers — in your browser.
Subnet Calculator
IPv4/IPv6 network, mask, hosts, and address class — browser-local.
IP Address Converter
IPv4/IPv6 decimal, hex, binary, compress/expand — local forms.
IP Range to CIDR
Minimal exact CIDR cover for an inclusive start–end range.
CIDR Summarize
Merge or dedupe CIDR lists with fail-fast validation.
IP in Subnet
Check IP ∈ CIDR or whether two CIDRs overlap.
Security & tokens
JWKS, X.509 certificates, and secrets scan — browser-local.
Scan secrets
Scan pasted text for secret-like patterns — documented subset, not gitleaks.
JWT Verify
Live JWT verify — 14 signing algs, JWKS/PEM/HMAC, aud/iss/exp — no URL fetch.
Inspect JWKS
Inspect JWK/JWKS with private fields redacted — paste-only, no remote fetch.
PEM ↔ JWK
Convert public PEM (SPKI) ↔ JWK JSON — private input redacted.
Decode certificate
Decode PEM X.509 certificates: subject, SANs, expiry, fingerprint — not a trust store.
Bcrypt Hash
Hash or verify passwords with bcrypt (cost 4–14) in the browser — not production auth.
API & schemas
OpenAPI tools to format, validate, and lint your specs.
Validate OpenAPI
Validate OpenAPI 3.0–3.2 schema conformance in your browser.
Lint OpenAPI
Lint OpenAPI path operations with a Spectral-style rule subset.
Format OpenAPI
Pretty-print OpenAPI JSON or YAML with 2 or 4 space indent.
JSON Schema Validator
Validate JSON data against Draft-07 or 2020-12 schemas.
JSON Schema to OpenAPI
Convert JSON Schema to a minimal OpenAPI 3.0 document.
OpenAPI to JSON Schema
Extract OpenAPI components.schemas into JSON Schema $defs.
Validate GraphQL
Validate GraphQL schema SDL with buildSchema in your browser.
HTTP Tools
Paste-local cURL, HTTP messages, URLs, HAR files, and Cookie / Set-Cookie headers — format and inspect in your browser, never sent.
URL Parser
Decompose a URL into protocol, host, path, query table, and hash — password masked, query editable.
cURL Formatter
Format Chrome Copy as cURL into multi-line, one-line, JavaScript fetch, or Python requests — never sent.
HTTP Message Parser
Parse a raw HTTP/1.1 request, response, or header block — start-line, duplicate headers, JSON pretty-print.
Cookie / Set-Cookie Parser
Paste Cookie or Set-Cookie, edit RFC 6265 attributes, see SameSite and prefix flags — never written to the cookie store.
HAR Inspector
Drop a HAR, filter the call list, extract cURL or HTTP/1.1, and download a sanitized file — never uploaded, never replayed.
Developer utilities
Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.
UUID Generator
Generate UUID v4, v7, or nil with hyphen, case, and bulk count options.
ULID Generator
Generate time-sortable Crockford Base32 ULIDs with Web Crypto — uppercase, monotonic option, bulk count 1–50.
Nanoid Generator
Generate Nanoid-style IDs (URL-safe, alphanumeric, or numeric) with size presets.
Unix Timestamp
Convert epoch seconds or milliseconds to ISO dates and back — UTC or local timezone.
Cron Parser
Parse 5- or 6-field cron expressions and list the next fire times.
Regex Tester
Test JavaScript regular expressions with flags, groups, and replace preview.
Slugify
Turn titles into URL-safe slugs with separator, casing, and length options.
Case Converter
Convert between camelCase, PascalCase, snake_case, SCREAMING_SNAKE, and kebab-case.
Text Diff
Compare two free-text blobs side by side line by line — complements JSON Diff.
Lorem Ipsum Generator
Placeholder text with themes, Plain/HTML/Markdown/JSON formats, and optional hierarchical headings.
Password Generator
Generate strong passwords with CSPRNG — length, charset, and ambiguous exclusion.
Number Base Converter
Convert integers between bases 2–36 with optional byte endianness for hex/bin.
Chmod Calculator
Toggle ugo rwx ↔ octal and read ls-style symbolic notation (setuid/setgid/sticky).
Text & Markdown
Count words, build Markdown TOCs, and clean line lists — all in your browser.
Word counter
Words, characters, sentences, paragraphs, and reading time — browser-local.
Sort & dedupe lines
Sort, dedupe, trim, and remove blank lines from pasted text.
Markdown TOC
ATX headings → linked Markdown table of contents with slug styles.
CSV to Markdown table
Convert CSV/TSV exports to GFM pipe tables (reverse mode included). Paste or file upload.
AI & LLM
Token counting, pricing estimates, and context-window fit — 100% browser-local.
LLM token counter
Count OpenAI, Claude, and Gemini tokens in your browser — exact tiktoken or honest estimates.
LLM pricing calculator
Estimate API cost from token counts and maintained per-model prices — no live scraping.
Context window calculator
See how much of a model context window your prompt uses — browser-local fit check.
Prompt optimizer
Analyze prompt structure, redundancy, and token waste — opt in to a local Qwen rewrite.
JSON → TOON
Convert JSON to TOON and compare tokens plus input cost vs JSON.
TOON → JSON
Decode TOON to pretty JSON with strict validation by default.
Test Data
Synthetic field values for fixtures and DB seed — reserved-range phone numbers first.
Test Name Generator
Synthetic given and family names for fixtures — dummy first/last names, 100% in the browser.
Test Email Generator
Reserved-domain dummy email addresses for fixtures — example.com by default, cannot receive mail.
Test Username Generator
Synthetic ASCII usernames for fixtures — login/handle columns, not a gamertag or availability checker.
Test Phone Number Generator
Reserved-range dummy phone numbers for fixtures — E.164, national, or digits, 100% in the browser.
Test Date Generator
Synthetic dates, datetimes, and times for fixtures — ISO 8601, SQL DATETIME, or Unix, UTC in the browser.
Test Numeric Generator
Synthetic integers and decimals for fixtures — INT, DECIMAL, qty, price, or port, in the browser, not a lottery.
Test URL Generator
Reserved-host dummy URLs for fixtures — example.com by default, not a shortener, encoder, or live mock API.
Test Company Name Generator
Synthetic company names for fixtures — legal-line strings with country suffixes, not a brand namer.
Test Postal Code Generator
Prefix-valid postal / ZIP / postcode strings for fixtures — checkout tax and shipping zones, not a street address.
Test Address Generator
Dummy street addresses for form QA, shipping-label paste, and fixtures — not for mail or geocoding.
JSON Test Data Generator
Schema-aware dummy JSON records — editable columns, copy a JSON array, CSV, or SQL INSERT for fixtures.
CSV Test Data Generator
Dummy CSV rows for spreadsheets and fixtures — Excel-aware delimiter and UTF-8 BOM on download, not a converter.
SQL Test Data Generator
Dummy INSERT rows for fixtures and DB seed — dialect quoting and typed literals, not a converter or SQL formatter.
Test Credit Card Generator
Luhn-valid Visa, Mastercard, Amex, and Discover test card numbers with expiry and CVV — sandbox prefixes, not a real payment method.
Test IBAN Generator
Mod-97-valid test IBANs for FR, DE, GB, ES, IT, NL, BE, CH, AT, and IE, with an optional fake BIC — not a real bank account.
Need deeper playbooks? Blog for long-form optimisation notes paired with each tool.