Modes are the main transformations applied to your HTML. You can enable multiple modes at once — they stack. All modes respect the Intensity % setting.

⊞ Table layout

Wraps each word in visible text nodes in its own <span style="display:inline-block;padding:0 2px;">. Word order is preserved — the email reads identically. The HTML structure becomes much more complex and harder for spam filters to pattern-match against known templates.

When to use: When you want the source structure to look different from a standard flat text template without changing the reading experience.

<p>Win a huge prize today!</p>

<p><span style="display:inline-block;padding:0 2px;">Win</span> <span style="display:inline-block;padding:0 2px;">a</span> <span style="display:inline-block;padding:0 2px;">huge</span>...</p>

↔ Split & invert

Inserts invisible zero-width space characters (Unicode U+200B) between randomly selected character pairs in every word. These characters are completely invisible to human readers — the word looks and reads normally. Spam filters doing exact string matching see a broken pattern they cannot recognise.

Win a prize

W​in a p​ri​ze

Aa Wrap letters in SPAN

Wraps every non-whitespace character in its own <span></span>. The email looks identical but the HTML source is much harder to pattern-match because every word is broken into individual tags.

Hello

<span>H</span><span>e</span><span>l</span><span>l</span><span>o</span>

¶ Wrap text nodes

Wraps each entire text block in a single <span>. Unlike "Wrap letters" it doesn't break words apart — it just adds a container. The email renders identically.

<p>Click here to win!</p>

<p><span>Click here to win!</span></p>

≈ Synonym swap

Replaces common spam-trigger words with contextual synonyms. For example free becomes complimentary, win becomes earn. The Intensity setting controls what percentage of trigger words are replaced — at 50% about half the found words get swapped, keeping the email reading naturally.

Built-in trigger words include: free, win, bonus, prize, cash, money, limited time, act now, urgent, exclusive, click here, buy now, and 20 more.

🔗 Randomize links

Appends random query parameters to every href URL in the HTML. The link still works — it goes to the same destination — but the URL string is different every time. Useful for making each variation trackable and unique.

href="https://example.com"

href="https://example.com?r=73841&_v=512"

🖼 Images → Base64 Needs internet

Downloads each external <img> image and converts it to a Base64 data URI embedded directly in the HTML. This means the image is no longer loaded from an external server — it's baked into the file.

🖼 Unique Base64 Needs internet

Same as Base64 but appends a unique random suffix to each image's data URI per variation. This means every output file has a slightly different image string even though the image looks identical. Useful for making each file cryptographically distinct.

◻ Images → background-image

Replaces every <img> tag with a <div> that uses the same image as a CSS background-image. The visual result is similar but the HTML structure is completely different from a standard img tag.

<img src="banner.jpg" width="600" height="200" alt="Banner">

<div style="background:url(banner.jpg) no-repeat center/contain;width:600px;min-height:200px;display:block;" role="img" aria-label="Banner"></div>

💬 Comment break

Inserts an empty HTML comment <!----> at a random position inside words in text nodes. Email clients (Outlook, Gmail, Apple Mail) strip HTML comments when rendering — the reader sees the full, unbroken word. Spam filters that do exact byte-level string matching see a broken pattern.

free bonus offer

fr<!---->ee bo<!---->nus of<!---->fer

⇄ Shuffle attributes

Randomly shuffles the order of HTML attributes on every tag. For example, a tag that originally has src then alt then width might be reordered to width then src then alt. Browsers and email clients parse attributes regardless of order — the email renders identically. The source fingerprint changes every time.

<img src="img.jpg" alt="Photo" width="600" height="300">

<img height="300" src="img.jpg" width="600" alt="Photo">

🗑 Delete tags

Removes <script> and <noscript> tags from the HTML. These are execution-risk tags that spam filters flag. Style, meta, and link tags are kept intact so your email layout and CSS rules are never affected.

Color variation range

Each hex color and rgb() value in the HTML is shifted by a random amount up to this value. Default: 11. At range 11, colors shift by up to ±11 on each RGB channel — a subtle difference invisible to the human eye but detectable in source comparison. Set to 0 to disable.

color: #3b82f6

color: #2e7af4

Padding / Margin range (px)

All padding and margin values are shifted by up to this many pixels. Default: 5. At range 5, a padding: 20px might become padding: 18px. Layout stays visually intact. Set to 0 to disable.

Number of output files

How many unique variations to generate when you click Generate & Download. Default: 5. Each file gets its own independent set of random changes. Maximum: 100.

Intensity %

The master dial for how aggressively transforms are applied. Range 0–100%, default 60%.

• 0% — no text nodes transformed at all, color/padding ranges scale to 0
• 30% — subtle: only about 30% of eligible text nodes get transformed
• 60% (default) — moderate: good balance between variation and readability
• 100% — maximum: every eligible element is transformed

These toggles run after all Modes have been applied. They are independent of mode selection — they always run when enabled.

Rename class and id ON by default

Renames every class="" and id="" attribute to a unique random string like vx_0_ab3cd. Also updates matching selectors inside any <style> blocks so CSS rules stay linked. Makes fingerprinting the template much harder.

<td class="header">

<td class="vx_0_k3p9q">

Randomly replace tags ON by default

Swaps HTML tags with compatible alternatives that have the same display type. For example <div> may become <section> or <article>. <span> may become <em> or <strong>. Table structure tags (table, tr, td, th) are never swapped to prevent layout breakage.

Font alternatives OFF by default

Swaps font-family declarations with equivalent alternatives. For example Arial may become Helvetica, Georgia may become Times New Roman. The email looks virtually identical because the fonts are similar.

Add HTML comments OFF by default

Inserts random HTML comments between tags, such as <!-- section-1047 --> or <!--[if gte mso 9]><![endif]-->. Comments are invisible to email recipients but differ in every variation. Only injected outside of <head>, <style>, and <script> blocks.

Character encoding variation OFF by default

Randomly converts some vowels and common characters (a, e, i, o, s) to their HTML entity equivalents. For example a → a. The browser renders them identically but the raw HTML looks different. The Intensity setting controls the probability of each character being encoded.

earn

earn

Inline styles → classes OFF by default

Moves repeated inline style="" attributes into a <style> block and replaces them with unique class names. Reduces file size when many elements share the same styles. The email renders identically.

Convert output to image (PNG) OFF by default

After all transforms, renders the HTML to a <canvas> using html2canvas and saves each variation as a PNG image instead of an HTML file. The ZIP will contain PNG files instead of HTML files. Useful for creating image-only emails that bypass text-based filters entirely.

Safe mode (letter stays readable) ON by default

When enabled, violmixxer guarantees the email output is visually identical to the input. The following are automatically skipped regardless of your other settings:

• Table layout mode — skipped (wraps words in spans; can affect line wrapping in narrow containers)
• Randomly replace tags — skipped (structural tag changes can affect rendering in strict email clients)
• Inline styles → classes — skipped (some email clients don't support embedded CSS, so this can break layout)

All other modes and transforms still run with Safe Mode ON — Split & invert, Comment break, Shuffle attributes, Synonym swap, Character encoding, Randomize links, Color/padding variation, Rename class/id, Font alternatives, Add HTML comments. All of these are invisible to human readers.

Instead of transforming the entire file, you can select a portion of the HTML in the code editor and transform only that selection. The rest of the template is left completely untouched.

Safe Mode is a single toggle in the Always-on Transforms card. When enabled, violmixxer automatically disables any transform that could cause the email to render differently for human readers.

Intensity is documented in the Parameters section above.

Click Analyze Template in the top bar to scan your pasted HTML and get a report. No external requests are made — analysis runs entirely in your browser.

Stats

The analyzer counts: total word count, number of <img> tags, number of <a> links, and total HTML file size in KB.

Spam Score

The analyzer checks the visible text against a list of 50+ known spam trigger words. The score (0–100) shows how risky the template looks to spam filters:

• 0–20 — Low risk — few or no trigger words
• 21–49 — Medium risk — some common trigger words present
• 50+ — High risk — many trigger words, recommend running Synonym swap mode

Spam Trigger Words

All detected trigger words are listed as individual tags. Use the Synonym swap mode to automatically replace them.

External References

All href, src, and CSS url() values pointing to external domains are listed. This helps you identify which images or links are loaded from third-party servers — potential tracking vectors or deliverability risks.

Preview one

Generates a single variation and displays it in the preview iframe on the left. Use this to quickly check whether your settings produce the output you want before committing to a full batch.

Generate & Download

Generates N independent variations (where N = Number of output files setting) and packages them into a single ZIP file named violmixxer-output.zip. The ZIP contains:

• violmixxer-1.html through violmixxer-N.html — when Convert to Image is OFF
• violmixxer-1.png through violmixxer-N.png — when Convert to Image is ON

Copy HTML

Copies the last generated variation to your clipboard as raw HTML text. You can then paste it directly into your email sending tool.

Fetch URL tab

Instead of pasting HTML manually, enter a URL in the Fetch URL tab and click Fetch & Load. violmixxer tries to load the page in this order:

1. Direct fetch (works on localhost or same-origin)
2. corsproxy.io — free public CORS proxy
3. api.allorigins.win — second free proxy