Jisubao provides 16+ handy tools for developers and office workers — JSON, Base64, passwords, QR codes, timestamps and more. 100% free, no signup, works right in your browser. We keep it free with ads & referral links, so you pay nothing.
Useful services we actually use. Referral links may earn us a commission at no extra cost to you.
Selling on Amazon or cross-border e-commerce? Use these 3 free tools to calculate your profit, optimize your title, and see your payout — all processed locally, no signup.
Know your net profit and margin per order — stop pricing by guesswork.
Cross-borderCheck if your title exceeds 200 characters and whether keyword density is healthy.
Cross-borderSet a custom rate and convert your USD net earnings into CNY payout.
Enter a category to generate a product shortlist + listing draft (demo). Try it →
Click any tool to open it instantly.
Plain-English tutorials and pitfalls for our tools. Original and free. See all →
The three real paths — no-code, CMS, custom code — the parts nobody mentions (domain, DNS, HTTPS, email), and when to hire a pro.
GuideWhy Math.random() is a predictable PRNG unsafe for API keys and tokens — and how crypto.getRandomValues gives you truly random strings.
GuideThe off-by-one trap in date math: time-of-day, time zones, leap years, and elapsed vs inclusive counting.
Tools run locally in your browser; input is not uploaded. To keep free, we show third-party ads (e.g. Google AdSense) and referral links. Manage cookies in your browser settings. We don't collect or sell your data.
Beyond free tools — the maker takes freelance work. Pick a service, open its page, email to start. Flat pricing, no middle-man.
Custom AI clips for TikTok, Shorts, Reels.
AssetsProduct images, 3D models, promo clips.
WebStatic sites & tool sites, like Jisubao.
DataExtract & clean data from any site.
DataMessy Excel/CSV? I make it clean.
CodeKill repetitive tasks with scripts.
WordsArticles, reports, product copy.
FinanceBacktest & factor screening (research).
BuyOriginal SEO & template resources.
Tools are free forever. If they saved you time, a tiny tip keeps the servers running — totally optional.
Send a one-off thank-you via Buy Me a Coffee. No ads, no strings — it goes straight to the maker.
Buy me a coffee →Need a fast, clean tool site or static web app like this one? The maker takes freelance work.
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