Công cụ trực tuyến miễn phí
370+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools37010.7K total uses
Categories15Active categories
Most usedJSON Formatter4.1K uses
Recently addedVS Code Extensions StoreNewest tool
CSS to Tailwind HTML to React
Free CSS to Tailwind converter and HTML to React JSX tool — paste code, preview, and copy utilities or components in your browser.
Used 0 times•Updated never
Hreflang Canonical Checker
Free hreflang and canonical checker — audit conflicts, missing return links, and SEO issues from pasted HTML or a fetched URL.
Used 0 times•Updated never
Image Watermark Add Remove
Add text or logo watermarks to your own images, or cover/undo a region privately in your browser — free image stamp tool.
Used 0 times•Updated never
Audio Noise Reduction Vocal Remover
Free lite noise reduction and karaoke-style vocal remover — preview and download WAV in your browser. Not AI stem separation.
Used 0 times•Updated never
PDF Page Organizer
Free PDF page organizer — rotate, reorder, and delete pages in your browser, then download the updated PDF. No signup.
Used 0 times•Updated never
PDF Unlock Password Remover
Unlock your password-protected PDF in the browser when you know the password. Download an unprotected copy — free and private.
Used 0 times•Updated never
PDF Compressor
Free PDF compressor — shrink PDF size in your browser with quality presets. No signup; files stay on your device.
Used 0 times•Updated never
QR Code Generator
Free QR code generator — create custom QR codes for URLs, Wi‑Fi, vCard, and more. Add colors and logo, then download PNG or SVG. No signup.
Used 0 times•Updated never
OG Twitter Card Preview
Free Open Graph and Twitter Card preview — paste HTML or fetch a URL to see Facebook and X social previews, plus a meta tag checklist. No signup.
Used 0 times•Updated never
Background Remover
Free background remover — erase photo backgrounds in your browser. Download transparent PNG or replace with a new color. Private, no upload, no signup.
Used 0 times•Updated never
JSON-LD Schema Generator
Free JSON-LD schema generator — build FAQ, Product, Article, LocalBusiness, HowTo, Breadcrumb and more. Copy valid schema.org markup for rich results. No signup.
Used 0 times•Updated never
Email Signature Generator
Free email signature generator — create a professional HTML signature with logo, social icons, and contact details. Preview and copy for Gmail or Outlook. No signup.
Used 0 times•Updated never