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    Text & Unicode · Logical/render mismatch

    Bidirectional Text Control Analyzer

    Bidirectional controls can change display order without changing logical byte order. This laboratory shows both views simultaneously and raises stronger warnings for directional overrides.

    Browse all labs Open universal Machine View
    Quick answer

    What does the Bidirectional Text show?

    Bidirectional controls can change display order without changing logical byte order. This laboratory shows both views simultaneously and raises stronger warnings for directional overrides.

    Human visibility
    Invisible controls; reordered glyphs
    Machine receiver
    Renderer and logical parser
    Robustness
    Renderer-dependent

    Research boundary: this page uses bounded, inert data and fixed safe examples. It never executes decoded content, requests secrets, calls third-party services, or performs actions against external systems.

    FIRST RUN / THREE STEPS

    Start with the prepared, bounded workflow.

    Nothing runs automatically
    1. Review the prepared starter input

      A bounded benign input is already present. Change it only when you are ready to test a different authorized artifact.

    2. Run Analyze directionality

      Run the normal first-pass analysis for the prepared values above.

    3. Scan before expanding

      Read the summary first, then scan findings and expand only the machine views you need.

    INPUT / CONTROL PLANE

    Prepare the input and choose one action.

    Ready

    The recommended first run is separated from alternate analyses. Inputs and selected files stay on this host.

    Current input state RLO example loaded

    These bounded starter values are ready to inspect. Review them before running the recommended action.

    25 / 2,048 bytes

    Enter or paste one bounded, authorized artifact. The original value remains in the form so you can revise and rerun it.

    Maximum: 2,048 UTF-8 bytes.

    Switch prepared example3 options

    Loading a sample changes only the form values. Review the result and run an action yourself.

    Prepared benign examples
    ACTION HIERARCHY

    Run the recommended first pass.

    Alternate actions remain available below, but the first pass is the clearest place to start.

    Other analyses1 action

    Inputs remain on this host. Text operations are size-limited; uploaded files are processed from PHP’s temporary upload and are not retained by the application.

    OUTPUT / MACHINE VIEWS

    Scan the result from summary to evidence.

    Run Analyze directionality to create the first result.

    The prepared starter input is ready. The output will lead with a summary and visible qualifications before the expandable machine views.

    SummaryFindingsMachine views
    Interpretation framework

    The same artifact can produce several valid observations.

    01

    Human view

    What a person naturally reads, sees, or hears.

    02

    Structural view

    What a parser, DOM, container reader, or metadata extractor exposes.

    03

    Decoder view

    What becomes meaningful only with a rule, key, tokenizer, model, or tool.

    04

    Defensive view

    What normalization, rendering, OCR, canonicalization, or policy changes.

    Evidence and decision boundary

    Use the result as bounded evidence, not as a universal verdict.

    Bidirectional controls can change display order without changing logical byte order. This laboratory shows both views simultaneously and raises stronger warnings for directional overrides.

    Interpretation rule

    Record the receiver and transformation.

    Machine-decodable is receiver-relative. Record the parser, preprocessing, codebook, tokenizer, key, model, and transformation path before generalizing from one result.

    Limitations

    What this page does not prove

    The visual result varies by browser, surrounding direction, fonts, and locale. The analyzer reports controls and logical order; it does not execute source code.

    Continue the investigation

    Related labs and source reports

    Invisible Unicode Code-point scanner or exact tokenizer Homoglyphs & Confusables Code-point and script analyzer Whitespace & Formatting Raw-text parser The Invisible Attack Surface: Zero-Width and Bidirectional Unicode Research report Invisible Unicode and Modern Language-Model Tokenizers Research report
    Continue exploring

    Move from the current explanation to a related guide, evidence source, or controlled workbench.

    Laboratory catalogChoose a focused local experimentBrowse 40 bounded laboratories spanning representation, files, messages, models, provenance, agents, supply chains, and defense.Open this path Topic guideUnderstand invisible Unicode and AICompare code points, glyphs, normalization, bidi controls, confusables, and tokenizer behavior.Open this path Defensive architectureBuild a safer model-ingestion boundaryPreserve evidence, compare representations, canonicalize allowlisted fields, retain provenance, and minimize privilege.Open this path