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Clean HTML for Substack

Substack is the leading newsletter and blog platform for independent writers. Substack's editor handles paste well for simple content but can struggle with complex formatting from Google Docs. Clean HTML from Publish Helper ensures your newsletter content is perfectly formatted.

IHTML Issues with Substack

Substack's editor converts paste into its own format but may preserve unwanted inline styles from Google Docs, especially font-family and font-size declarations that override Substack's newsletter typography. Email delivery adds another layer — bloated HTML can trigger spam filters or render poorly in email clients.

IIHow to Paste Clean HTML into Substack
  1. 1.

    Copy your content from Google Docs, Word, or any editor

  2. 2.

    Paste into Publish Helper and click 'Clean HTML'

  3. 3.

    Copy the clean HTML from Publish Helper

  4. 4.

    Paste directly into Substack's editor

  5. 5.

    Preview your post and send a test email to verify formatting

IIISubstack Tips
IVFrequently Asked Questions

Why does my Substack email look different from the web post?

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Email clients render HTML differently from web browsers. Inline styles from Google Docs can cause inconsistencies between Substack's web view and the email version. Clean HTML renders more consistently across both.

Does dirty HTML affect email deliverability?

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Bloated HTML can increase email size and trigger spam filters. Clean HTML from Publish Helper reduces email weight, which helps with deliverability and load times in email clients.

Can I preserve my Google Docs formatting on Substack?

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Substack has its own typography that you should lean into. Instead of trying to preserve Google Docs formatting, clean it with Publish Helper and let Substack's styles handle the presentation.

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Last updated: March 2026

Changelog

v2.2.02026-03-18
  • NewAI-Powered Title to SEO Slug — Convert blog titles in any language to SEO-friendly English slugs in under 10 seconds
  • NewSlug generator toggle on the main page — generate slugs right after editing, above the fold
  • NewTable support — pasted tables from Google Docs now render correctly
  • NewRemove <br> after headings cleanup option (on by default)
  • NewPartial text selection copy in the HTML code view
  • NewSticky Clean HTML button at the bottom of the page
  • ImprovedHeading conversion now strips prefixes from existing heading tags and supports Chinese full-width colon (:)
  • ImprovedShared footer across all pages
v2.1.22026-03-17
  • FixBug fixes and improvements
v2.1.12026-03-16
  • FixBug fixes and improvements
v2.1.02026-03-16
  • NewFormatted/Raw toggle for the HTML code view
  • ImprovedCopying from the code panel now always gives clean, unformatted HTML
v2.0.02026-03-16
  • NewWelcome to Publish Helper — free online tools for content editors
  • ImprovedImproved search engine visibility
v1.1.02026-03-16
  • ImprovedClipboard copy — clean HTML output matches the code view
v1.0.02026-03-16
  • NewRich text editor with Google Docs paste support
  • NewHTML cleanup: strip styles, classes, empty tags, and Google Docs artifacts
  • NewHeading conversion from text prefixes to proper HTML tags
  • NewFind & replace with regex support and saveable presets
  • NewSyntax-highlighted HTML preview with one-click copy