hYYa ink: PDF & Markdown

Stop reading syntax. Start reading documents.

hYYa ink opens the files developers, students and academics work with every day, and turns them into readable, editable documents instead of walls of raw text.

ONE APP, MANY FORMATS

• Markdown — rendered live, with a formatting toolbar
• JSON, YAML, TOML, XML — collapsible trees instead of nested brackets
• CSV and TSV — a real table: sort, filter, find & replace, edit cell by cell
• Mermaid and Graphviz — diagrams drawn on your device, fully offline
• LaTeX — maths typeset properly
• Jupyter notebooks — prose, code and text output, cleanly laid out
• AsciiDoc, Org-mode, diff, logs — readable at last
• PDF — a first-class document, not an afterthought

EDIT THE SOURCE, WATCH IT UPDATE

Switch between the document and its source in one tap. Turn your phone sideways, or use a tablet, and Split view shows both at once. Markdown gets a toolbar for headings, bold, italics, lists, quotes, code and links. Saving writes back to the file you opened. Start a new document in any format: tap “New document”, then choose Graphviz, Mermaid, LaTeX, JSON and more.

SAVE AS ANOTHER FORMAT

Save a document as a new file in another format: JSON, YAML, TOML and XML into one another, tables as CSV or TSV, notebooks and Org files as Markdown, Markdown and AsciiDoc as web pages, and diagrams as SVG or PNG images. If something can't carry over exactly, hYYa ink tells you before you save.

PDF — READ, SEARCH, FILL IN, SIGN

Open any PDF as a real document. Select and copy its text. Search it, with a running match count. Browse the pages as thumbnails and jump straight to the one you want. Is the file password-protected? hYYa ink asks for the password and opens it.

To add text, tap the exact spot on the page and type, then drag the text into place. Draw your signature by hand, then place, resize and turn it. Save it, or your initials, for next time, and add stamps such as Approved, Paid or today's date. Draw freehand on a pad and place the drawing on the page; with a stylus, pressure sets each stroke's weight. Drag across a line of text to highlight, underline or strike it through. Undo removes the last thing you added.

Make a scanned PDF searchable. Text recognition runs on your device, and your pages never leave it. It reads Latin script and Arabic.

You can also reorganise pages, extract pages or split a PDF into files, save pages as images, make a PDF from photos, remove the password from a PDF you've opened, and protect, compress or watermark a PDF. Redaction removes the words from the page, rather than just covering them up.

Each of these, like making a PDF searchable, writes a NEW file, and the PDF you opened is never changed. You can also compare two PDFs to see which pages differ.

BRING YOUR OWN AI

Use your own key with an AI service: OpenRouter, Groq, Together AI, or another service that works the same way. Explain, summarize and translate work on every document, PDFs included; reformat, fix errors or write Mermaid code for a diagram work on the others. Your key is encrypted on the device. Only the open document's text is sent, and only when you run an action. Every AI result says it was written by AI and names the model.

PRIVATE BY DESIGN

No accounts. No ads. Every format renders offline on your device, and your documents stay there unless you run an AI action. Google's text recognition sends Google its own diagnostics — never your documents.

FREE TO READ, PRO TO EDIT

Reading every format is free forever — and so are saving it as a PDF and printing it. On PDFs, searching the text, copying it and browsing the pages are free too.

A 7-day trial unlocks everything. After that, a single one-time purchase unlocks editing, the PDF tools, saving in other formats and AI permanently. No subscription.

From hYYa — more than apps. Companions you can trust.