Dougudana Tools

PDF, image, date, and calculation tools that work the moment you open them

PDF & Files

PDF & FilesExtract PDF Pages — No UploadPull out just the pages you need into one PDF. Invert the selection to delete pages, or reorder them as you like.PDF & FilesImages to PDF — No UploadCombine photos and screenshots into one PDF. Fit them to A4 or keep the original size — your images are never uploaded.PDF & FilesMerge PDF — No UploadCombine several PDFs into one. Reorder before merging, and your files never leave your browser.PDF & FilesRotate PDF — No UploadFix pages that came out sideways. Rotate selected pages in 90° steps — text stays text, so search and copy keep working.PDF & FilesSplit PDF — No UploadCut one PDF into several files — page by page or at the positions you choose. Your files never leave your browser.

Text

TextGenkō Yōshi (Japanese Manuscript Paper) CalculatorConvert Japanese text into 400-character manuscript-paper pages, simulating real line breaks — plus character and word counts.TextThread Splitter — split long text by each service's own counting ruleSplits long text into a thread using each service's real counting rule: X weights CJK characters as 2 and counts any URL as 23. It recomputes the room for the numbering itself, so the last post never goes over, and it never cuts inside an emoji or a URL.

Images

ImagesBatch Image Resizer — No UploadResize and convert multiple images at once. Everything happens locally in your browser — your images never leave your device.

Calculators

CalculatorsJapan Consumption Tax & Discount CalculatorConvert between tax-included and tax-excluded prices with Japan's 10% / reduced 8% consumption tax — including the planned 1% food rate from April 2027 — total a receipt from either tax-included or tax-excluded amounts with rounding applied once per rate, plus percent-off discounts.

Date & Time

Date & TimeJapanese School Grade & Age CalculatorFind the age, current school grade in Japan's April-based system, and entrance/graduation years from a birth date — or run it backwards from a grade to the range of birth dates. Early-birthday rules included.Date & TimeJapan Business Days CalculatorCount business days in Japan or find the date N business days ahead. Japanese public holidays are computed automatically.Date & TimeDay Counter — Days Between, Days UntilDays between two dates, the date N days from now, anniversary milestones, Japanese "within N days" deadlines counted under the Civil Code, and "N days before" deadlines counted backwards. Periods written in weeks are counted under art. 143(2).