Why does mixed Urdu and English text render wrong?

The Unicode bidirectional algorithm guesses direction from surrounding characters. Inside a left-to-right context, neutral characters like punctuation and digits next to an Urdu run can attach to the wrong side, scrambling the visual order. Explicit bidi controls fix this.

What is the difference between isolate, embed, and mark?

Isolate (RLI…PDI, U+2067/2069) is the modern recommendation: it treats the run as a self-contained unit and prevents bleed-through. Embed (RLE…PDF) is the older mechanism. Mark (RLM, U+200F) is the lightest touch, nudging neutral characters without full wrapping.

Are the inserted characters visible?

No. Bidi controls are zero-width and invisible when rendered, but they change how surrounding text is laid out. The tool also shows a visualized view so you can see exactly which controls were added.

When should I use this?

Use it when pasting Urdu into a left-to-right field such as an English HTML page, a JSON string, a code comment, or a chat app that does not auto-detect direction, and the Urdu appears reversed or mis-ordered.

Does the text get sent anywhere?

No. The bidi wrapping is computed in your browser. Nothing you type is uploaded, stored, or logged.

Urdu RTL Direction Fixer

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Urdu mixed into left-to-right contexts often renders with its words or punctuation out of order. The cause is the Unicode bidirectional algorithm guessing wrong about neutral characters. This tool inserts the explicit control characters that force correct direction.

How it works

The text is scanned for maximal runs of strong right-to-left characters — the Arabic-script blocks that Urdu uses, including the presentation-forms ranges. Each such run, together with the neutral punctuation and spaces inside it, is wrapped in a bidi control pair chosen by the selected method:

isolate:  ⟨RLI⟩ run ⟨PDI⟩   (U+2067 … U+2069)  recommended
embed:    ⟨RLE⟩ run ⟨PDF⟩   (U+202B … U+202C)  legacy
mark:     ⟨RLM⟩ run ⟨RLM⟩   (U+200F)           lightweight

The controls are invisible at render time but instruct the layout engine to treat the wrapped run as right-to-left. A second box visualizes the inserted characters with bracketed labels so you can verify the result.

Example and notes

In The book کتاب is on the میز table., the two Urdu words are isolated so they display correctly without dragging the surrounding English words around. The isolate method is preferred for new content because it prevents one wrapped run from affecting the direction of text after it — a known failure mode of the older embed controls. Use the lightweight mark method only when a platform strips the heavier controls.