Generate Zalgo Glitch Text with a Repeatable Seed

Supply the source text, choose an intensity from one to five, and optionally set an integer seed. The generator adds Unicode combining marks above, through, and below visible characters without relying on random system state. The same text, intensity, and seed therefore produce exactly the same result every time, making the effect practical for repeatable designs, tests, usernames, captions, and creative prototypes.

Create a controlled glitch instead of an accidental one

Zalgo text works by placing Unicode combining marks after ordinary visible characters. Fonts normally use those marks for accents and related writing features, but a dense stack can extend above, through, and below a letter to create the familiar corrupted appearance. This generator chooses marks from all three positions and applies the exact number selected by the intensity setting to each non-whitespace character. Level one adds a light disturbance that often remains easy to read, while level five produces a much denser texture. Spaces and line breaks are preserved, so the wording and basic layout remain recognizable. Existing combining marks are left untouched rather than decorated again, which prevents a supplied accent from becoming an unpredictable multiplier. The result is still Unicode text rather than an image. You can copy it into a mockup, caption, test fixture, message, or any other system that accepts Unicode, although the final appearance depends on the font and renderer used by that destination.

Use the seed to reproduce the same result

Many novelty text generators vary their output on every run, which is entertaining but inconvenient when a design, snapshot test, or campaign draft must be recreated later. Here, the seed is part of the input and drives a small deterministic number generator. When the source text, intensity, and seed are identical, the sequence of combining marks is identical too. Change only the seed and you receive another visual variation with the same density; change the intensity and each eligible character receives a different fixed number of marks. The default seed is zero, so omitting it is still repeatable. A seed may be any safe integer, including a negative value, and it is treated consistently by the algorithm. Record the three inputs alongside an approved output if reproducibility matters. This deterministic contract also makes the API useful in automated pipelines: a retry cannot silently alter a previously selected treatment, and a golden test can compare exact strings rather than relying on a vague visual judgment.

Choose an intensity that suits the destination

Start with intensity one or two when the words still need to be read quickly. Higher settings are better suited to horror graphics, experimental headings, fictional terminal corruption, or deliberate stress testing of text layouts. Combining marks can increase line height, overlap nearby interface elements, complicate cursor movement, and be announced awkwardly by assistive technology. For that reason, keep an accessible plain-text version wherever the content carries essential meaning, and avoid using decorated text for passwords, addresses, commands, identifiers, search keys, or data that another program must parse. Test the output in the actual target application because operating systems, browsers, fonts, and social platforms may position, normalize, limit, or remove marks differently. The generator does not damage the source or replace its base characters; it returns a new string with marks inserted. API requests cost $0.002, while the browser version runs locally. An out-of-range intensity is rejected instead of being silently clamped, so a configuration mistake is visible and repeatable rather than producing an unexpectedly mild or overwhelming result.