hayaku.online
Free tools that finish in your browser
Reiwa 8 take-home estimates, PDF merge/split, and JSON formatting—all in your browser. No uploads. No signup.
Tools
Reiwa 8 take-home pay calculator
Estimate income tax, residence tax, and take-home from gross salary in your browser. No signup, no upload.
Merge PDF with no upload
Merge or split PDFs locally in your browser. Nothing uploaded.
JSON Format & Minify
Pretty-print or minify JSON in your browser. Data is never uploaded to our servers.
FAQ
What tools does hayaku.online provide?
A Reiwa 8 (2026) take-home pay estimator (income and residence tax overview), in-browser PDF merge/split, and JSON format/minify—free, with no install or sign-up.
Are salary figures, PDFs, or JSON uploaded?
No. Tax math, PDF processing, and JSON formatting all run in your browser. We do not upload your inputs or files to our servers for storage.
Can I use the take-home result for official filing?
Results are estimates only and omit items like mortgage deductions or furusato tax. Follow a tax professional or tax office for filing.
Do PDF and JSON tools work on phones?
Yes, via mobile browsers. Very large PDFs may need more memory—prefer a computer for heavy files.