Free tools that never upload your files
Free · No sign-up · 100% in-browser privacy — your files never leave your device
13 tools · 12 run locally · AI writer is server-side · 0 accounts
AI Listing Writer ★ NEW
Describe your product, get an SEO title, five benefit bullets and a full description — tuned per marketplace.
Product Image Resizer ★
One photo in, marketplace-ready images out — presets, white background, watermark, four sizes in one click.
Listing Copy Generator 中文
Titles, bullets and descriptions for Chinese marketplaces, with a banned-word check.
Image Compressor 中文
Shrink JPG, PNG and WebP with a quality slider and optional max width.
Word Counter 中文
Live counts of characters, words, sentences, lines and paragraphs.
JSON Formatter 中文
Beautify, minify and validate JSON, with error locations pinpointed.
URL Encoder / Decoder 中文
encodeURI and encodeURIComponent modes, both directions.
Duplicate Line Remover 中文
Remove duplicate lines, blank lines and stray spaces.
Unix Timestamp Converter 中文
Timestamps to dates and back; seconds or milliseconds, auto-detected.
Color Converter 中文
HEX, RGB and HSL with a live preview.
About QingTools
QingTools started as a personal toolbox for the small, repeated jobs of online selling: prepping product images, writing listings, counting words, formatting JSON before it goes into a terminal. Each tool is a single page that opens ready to use.
Unlike most online tool sites, everything here runs in your browser. Your text and images never leave your device — no uploads, no accounts, no tracking. As a side effect, it's fast even on large files, because nothing makes a round trip to a server.
QingTools is built and maintained by one software engineer. Need something bigger — an AI chatbot, a company knowledge base, an on-premise LLM? See our services.